EP0729466A1 - Pyron derivate als protease inhibitoren und antivirusmittel - Google Patents

Pyron derivate als protease inhibitoren und antivirusmittel

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Publication number
EP0729466A1
EP0729466A1 EP95900457A EP95900457A EP0729466A1 EP 0729466 A1 EP0729466 A1 EP 0729466A1 EP 95900457 A EP95900457 A EP 95900457A EP 95900457 A EP95900457 A EP 95900457A EP 0729466 A1 EP0729466 A1 EP 0729466A1
Authority
EP
European Patent Office
Prior art keywords
pyran
hydroxy
thio
phenyl
mmol
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP95900457A
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English (en)
French (fr)
Inventor
John Michael Domagala
Edmund Lee Ellsworth
Elizabeth Lunney
Daniel Fred Ortwine
Kimberly Suzanne Para
Josyula Venkata Nagendra Vara Prasad
Tomi Sawyer
Bradley Dean Tait
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Parke Davis and Co LLC
Original Assignee
Parke Davis and Co LLC
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Filing date
Publication date
Priority claimed from US08/319,768 external-priority patent/US5808062A/en
Application filed by Parke Davis and Co LLC filed Critical Parke Davis and Co LLC
Publication of EP0729466A1 publication Critical patent/EP0729466A1/de
Withdrawn legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D405/00—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom
    • C07D405/02—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings
    • C07D405/06—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings linked by a carbon chain containing only aliphatic carbon atoms
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A61P31/04—Antibacterial agents
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A61P31/12—Antivirals
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D309/00—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings
    • C07D309/34—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members
    • C07D309/36—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members with oxygen atoms directly attached to ring carbon atoms
    • C07D309/38—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members with oxygen atoms directly attached to ring carbon atoms one oxygen atom in position 2 or 4, e.g. pyrones
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D405/00—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom
    • C07D405/02—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings
    • C07D405/10—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings linked by a carbon chain containing aromatic rings
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D405/00—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom
    • C07D405/02—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings
    • C07D405/12—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings linked by a chain containing hetero atoms as chain links
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D407/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having oxygen atoms as the only ring hetero atoms, not provided for by group C07D405/00
    • C07D407/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having oxygen atoms as the only ring hetero atoms, not provided for by group C07D405/00 containing two hetero rings
    • C07D407/04—Heterocyclic compounds containing two or more hetero rings, at least one ring having oxygen atoms as the only ring hetero atoms, not provided for by group C07D405/00 containing two hetero rings directly linked by a ring-member-to-ring-member bond
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D407/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having oxygen atoms as the only ring hetero atoms, not provided for by group C07D405/00
    • C07D407/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having oxygen atoms as the only ring hetero atoms, not provided for by group C07D405/00 containing two hetero rings
    • C07D407/12—Heterocyclic compounds containing two or more hetero rings, at least one ring having oxygen atoms as the only ring hetero atoms, not provided for by group C07D405/00 containing two hetero rings linked by a chain containing hetero atoms as chain links
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D409/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms
    • C07D409/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms containing two hetero rings
    • C07D409/04—Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms containing two hetero rings directly linked by a ring-member-to-ring-member bond
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D413/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms
    • C07D413/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing two hetero rings
    • C07D413/12—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing two hetero rings linked by a chain containing hetero atoms as chain links

Definitions

  • the present invention relates to pyrone derivatives that are inhibitors of aspartyl proteases, in particular the aspartyl proteases found in retroviruses including Human Immunodeficiency Virus (HIV) .
  • the pyrones are expected to have utility as antiviral agents, for the treatment of 10 infection caused by HIV or other retroviruses employing aspartyl proteases, and to be useful in the treatment of diseases caused by the retroviruses, including AIDS.
  • AIDS Acquired Immunodeficiency Syndrome
  • HTV Human Immunodeficiency Virus
  • HIV-l HIV-2
  • HIV will be used as a general term describing a variety of strains and mutants of the Human Immunodeficiency Virus.
  • the detailed study of HIV has given rise to many approaches to antiviral drug development including inhibition of the viral 25 aspartyl protease (D. Richman, Control of Virus Diseases , 45th Symposium of the Society for General Microbiology, 261-313 (1990)) .
  • Aspartyl proteases have been found in many retroviruses including the Feline Immunodeficiency Virus, the 30 Myeloblastosis Associated Virus, HIV, and the Rous Sarcoma * Virus [H. Toh et al . , Nature , 315: 691 (1985); J. Kay, B. M. ⁇ Dunn, Biochim. Biophys . Acta , l: 1048 (1990); C. Cameron et al . , J. Biological Chem . , 168, 11711-720 (1993)]. Since there are structural similarities among the known retroviral 35 proteases, compounds which inhibit the HIV protease may well inhibit other retroviral proteases.
  • HIV aspartyl protease is responsible for post- translational processing of viral precursor polyproteins such as pol and gag. (M. Graves, Structure and Function of the Aspartic Proteases, 395-405 (1991)). Cleavage of these polyproteins by this protease is essential for maturation of the virus, since the proteolytic activity necessary for polyprotein processing cannot be provided by host cellular enzymes. An important finding has been that viruses which lack this protease, or contain a mutation which produces a defective protease, lack infectivity [C. Peng et al . , J. Virol , 63: 2550-2556 (1989) and N. Kohl et al . , Proc. Nati . Acad. Sci .
  • HIV protease inhibitors have been extensively reviewed (see for example A. Tomasselli et al . , Chimica Oggi , 9: 6-27 (1991) and T. Meek, J. Enzyme Inhibition 6: 65-98 (1992)). However, the majority of these inhibitors are peptides and thus unsuitable as drugs, due to the well known pharmacological deficiencies exhibited by most peptide drugs (biliary excretion, low bioavailability and stability in physiological milieu, etc.) Nonpeptidic inhibitors of HIV protease are thus very important, since these may lead to very useful therapeutic agents.
  • Hei 3-227923 claimed coumarins with anti-HIV activity. However, only 4-hydroxycoumarin was specifically described without discussing its mechanism of action.
  • World Patent 89/07939 claimed eight cou arin derivatives as HIV reverse transcriptase inhibitors with potential antiviral activity. These derivatives are hexachlorocoumarin, 7-acetoxycoumarin, and the structures shown below.
  • Warfarin (3-( ⁇ -acetonylbenzyl)-4-hydroxycoumarin) , shown below, was reported by R. Nagorny et al . in AIDS, 7: 129-130 (1993) as inhibiting cell-free and cell-mediated HIV infection. However, Warfarin was the only pyrone studied and its mechanism of action in HIV inhibition was not specified.
  • Patent Number 3,206,476 describes several pyrones, specifically 3-substituted-4-hydroxy-6-aryl-2- pyrones, as antihypertensive agents.
  • the range of substituents at the 3-position of these heterocycles is limited to halo and amino groups and alkanoylamino derivatives.
  • United States Patent Number 3,818,046 describes several pyrone derivatives, specifically 4-hydroxypyrones with sulfur- containing carbon chains at the 3-position, as growth stunters and antimicrobial agents. The substitution at the 6-position of these heterocycles is limited to the methyl group.
  • R Me
  • M H or alkali metal
  • the present invention is based in great part on the extraordinary discovery of the inventors that novel tri- and tetrasubstituted pyrones and related compounds, selected from a very broad spectrum of tailored molecular structures, potently inhibit the HIV aspartyl protease blocking infection by HIV.
  • the present invention is also based on the insights of the inventors regarding the mechanism of action of antiviral drugs, especially as revealed by their studies on structure-activity relationships characteristic of anti-HIV compounds that include pyrones.
  • the invented pyrones are expected to be extremely useful in the development of treatments for infections caused by viruses, especially by retroviruses that rely on aspartyl protease activities for replication and infectivity.
  • retrovirus is HIV.
  • virus blockers the pyrones are also expected to be very useful in the treatment of diseases and syndromes associated with viral pathogens.
  • One such syndrome is AIDS.
  • Efficient syntheses of the biologically active pyrones involving either de novo assemblies of the pyrone nucleus or modifications of suitably functionalized pyrones, are disclosed. Furthermore, many working examples outlining the preparation of specific pyrones whose structures contain the desired functional groups in proper geometric arrangements are given.
  • the present inventors contemplate the preparation of pharmaceutically useful antiviral compositions comprising one or more of the invented pyrones and related compounds and a pharmaceutically acceptably carrier. They also contemplate the use of these compositions, alone or in combination with other antiviral treatments, in the treatment of infections and diseases caused by retroviruses, including AIDS.
  • the present invention relates to compounds, or the pharmaceutically acceptable salts thereof, of Formula 1, shown below,
  • X is OR 1 , NHR 1 , SR 1 , C0 2 R 4 or CH 2 OR ** wherein R 1 is R 4 or COR 4 wherein R 4 is as defined below;
  • Y is oxygen or sulfur
  • Z is oxygen or sulfur
  • a and A 1 are independently a chemical bond, an unsubstituted or substituted phenyl, naphthyl, a 5- or 6- membered heterocyclic ring, cycloalkyl, or a fused ring system of from 8 to 10 atoms or a substituted derivative thereof wherein the substituents are one or more of F, Cl, Br, OR 4 , N(R 4 ) 2 , C0 2 R 4 , CON(R 4 ) 2 , COR 4 , R 4 , OCH 2 0, OCH 2 CH 2 0, or C ⁇ N wherein R 4 is independently hydrogen, substituted on unsubstituted alkyl, cycloalkyl, alkylcycloalkyl or phenyl wherein the substituents are one or more of C0 2 R 2 , CON(R 2 ) 2 , F, OR 2 , SR 2 , N(R 2 ) 2 , CN, phenyl, naphthyl, a heterocycle or CF
  • R 5 is hydrogen, alkyl, cycloalkyl, alkylcycloalkyl, phenyl, or the substituted derivatives thereof wherein the substituents are one or more of C0 2 R 2 , CON(R 2 ) 2 , F, OR 2 , phenyl, naphthyl, CF 3 , OR 1 , NHR 1 , SR 1 , or CH 2 0R * - wherein R 1 is as defined above;
  • W 2 is an oxygen, NR 3 , S(0) p , S0 2 NR 3 , -OCO, NR 3 COV g A and NCOV g R 3 wherein g is either 0 or 1 and V is 0, S, NR 3 or CHR 3 ; m and n are each independently an integer of from 0 to 4 with the provision that when and W 1 are both heteroatoms or when W 2 and 3 are both heteroatoms, m is an integer of from 2 to 4; and with the further proviso that R 3 1 (CH 2 ) ra W(CH 2 ) ⁇ A cannot be methyl or ethyl.
  • Preferred compounds of the instant invention are those of Formula 1 shown above wherein
  • R s is hydrogen, methyl, ethyl, propyl, cyclopropyl, hydroxyl, carboxyl, or hydroxymethyl. More preferred compounds of the present invention are those of Formula 1 shown above wherein X is hydroxyl; Z is oxygen; Y is oxygen; , W 1 , and 3 are each independently oxygen, sulfur, S0 2 NR 3 , NR 3 , or C(R 3 ) 2 and W 2 is O, S or NR 3 , wherein R 3 is independently hydrogen, (CH 2 ) p R 4 , or (CH 2 ) p A wherein p is an integer of from 0 to 2, R 4 is hydrogen, methyl, ethyl, isopropyl, isobutyl, cyclopropyl, cyclohexyl, cyclopropyl ethyl, cyclohexylmethyl, CH 2 C0 2 R 2 , phenyl or benzyl; R 2 is H, methyl, ethy
  • R 5 is hydrogen, methyl, ethyl, or hydroxymethyl
  • Acetic acid 3-[ (2-isopropylphenyl)thio]-2-oxo-6- [4-(pyridin-3-ylmethoxy)phenyl]-2H-pyran-4-ylester;
  • Isobutyric acid 3-[ (2-isopropylphenyl)thio]-2- oxo-6-[4-(pyridin-3-ylmethoxy)phenyl]-2H-pyran-4- ylester;
  • alkyl usually represented by an "R" means a straight or branched hydrocarbon radical having from 1 to 12 carbon atoms unless otherwise specified and includes, for example, methyl, ethyl, n- propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert- buty1, n-pentyl, n-hexyl, n-heptyl, n-octyl, n-nonyl, n-decyl, undecyl, and dodecyl.
  • the alkyl groups may contain one or more sites of unsaturation such as double or triple carbon-carbon bonds.
  • the alkyl group is unsubstituted or substituted by from 1 to 3 substituents selected from alkyl, alkoxy, thioalkoxy all as defined herein, hydroxy, thiol, nitro, halogen, amino, formyl, carboxyl, nitrile, -NH-CO-R, -CO-NH-, - C0 2 R, -COR, aryl, or heteroaryl wherein alkyl (R) , aryl, and heteroaryl are defined as herein.
  • cycloalkyl also represented by an “R” means a hydrocarbon ring which contains from 3 to 12 carbon atoms unless otherwise specified, for example, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, and adamantyl. Where possible, the cycloalkyl group may contain a single double bond.
  • the cycloalkyl ring may be unsubstituted or substituted by from 1 to 3 substituents selected alkyl, alkoxy, thioalkoxy all as defined herein, hydroxy, thiol, nitro, halogen, amino, formyl, carboxyl, nitrile, -NH-CO-R, -CO-NHR-, -C0 2 R, -COR, aryl, or heteroaryl wherein alkyl (R) , aryl, and heteroaryl are defined as herein.
  • alkoxy and thioalkoxy are O-alkyl or S-alkyl as defined above for alkyl.
  • alkylcycloalkyl means a cycloalkyl attached to an alkyl chain where the terms cycloalkyl and alkyl are defined above.
  • spirocycle refers to a carbocyclic or heterocyclic ring whose ends meet at a single carbon in a ring or chain.
  • spirocycles are ring A in the following:
  • aryl means an aromatic radical which is a phenyl group, a benzyl group, a naphthyl group, a biphenyl group, a pyrenyl group, an anthracenyl group, a fluarenyl group or a fused ring resulting from any two of phenyl, naphthyl, and a 5- or 6- membered ring containing from 0 to 3 heteroatoms selected from quinolones, isoquinolones, indoles, indanes, benzofurans, benzothiophenes , benzoxazoles, benzothiazoles, benzisoxazoles, coumarins, benzimidazoles and the like, unsubstituted or substituted by 1 to 3 substituents selected from alkyl as defined above, alkoxy as defined above, thioalkoxy as defined above, hydroxy, thiol, nitro, halogen, amino, formyl, carboxy
  • heteroaryl and “heterocycle”, usually represented by an "A” mean a heteroatom containing ring radical which is 2- or 3-thienyl, 2- or 3- furanyl, 2- or 3-pyrrolyl, 2-, 4-, or 5-imidazolyl, 3- , 4-, or 5-pyrazolyl, 2-, 4-, or 5-thiazolyl, 3-, 4-, or 5-isothiazolyl, 2-, 4-, or 5-oxazolyl, 3-, 4-, or 5-isaxazolyl, 3- or 5- 1,2,4-triazolyl, 4- or 5- 1,2,3-triazolyl, tetrazolyl, 2-, 3-, or 4-pyridiny1,, 3-, 4-, or 5-pyridazinyl, 2-pyrazinyl, 2-, 4-, or 5- pyri idinyl, 2-, 3-, 4-, 5-, 6-, 7-, or 8-quinolinyl,
  • Halogen is fluorine, chlorine, bromine or iodine.
  • Some of the compounds of Formula 1 are capable of further forming pharmaceutically acceptable acid- addition and/or base salts. All of these forms are within the scope of the present invention.
  • Pharmaceutically acceptable acid addition salts of the compounds of Formula 1 include salts derived from nontoxic inorganic acids such as hydrochloric, nitric, phosphoric, sulfuric, hydrobromic, hydriodic, hydrofluoric, phosphorous, and the like, as well as the salts derived from nontoxic organic acids, such as aliphatic mono- and dicarboxylic acids, phenyl- substituted alkanoic acids, hydroxy alkanoic acids, alkanedioic acids, aromatic acids, aliphatic and aromatic sulfonic acids, etc.
  • Such salts thus include sulfate, pyrosulfate, bisulfate, sulfite, bisulfite, nitrate, phosphate, monohydrogenphosphate, dihydrogenphosphate, metaphosphate, pyrophosphate, chloride, bromide, iodide, acetate, trifluoroacetate, propionate, caprylate, isobutyrate, oxalate, malonate, succinates suberate, sebacate, fumarate, maleate, mandelate, benzoate, chlorobenzoate, methylbenzoate, dinitrobenzoate, phthalate, benzensoulfonate, toluenesulfonate, phenylacetate, citrate, lactate, maleate, tartrate, methanesulfonate, and the like.
  • salts of amino acids such as arginate and the like and gluconate, galacturonate (see, for example, Berge, S.M., et al., "Pharmaceutical Salts," Journal of Pharmaceutical Science , 66: 1-19 (1977) .
  • the acid addition salt of said basic compounds are prepared by contacting the free base form with a sufficient amount of the desired acid to produce the salt in the conventional manner.
  • Pharmaceutically acceptable base addition salts are formed with metals or amines, such as alkali and alkaline earth metals or organic amines.
  • metals used as cations are sodium, potassium, magnesium, calcium, and the like.
  • suitable amines are N,N , -dibenzylethylenediamine, chloroprocaine, choline, diethanolamine, dicyclohexylamine, ethylenediamine, N-methylglucamine, and procaine (see, for example, Berge, S.M., et al., "Pharmaceutical Salts," Journal of Pharmaceutical Science , 66: 1-19 (1977).
  • the base addition salts of said acidic compounds are prepared by contacting the free acid form with a sufficient amount of the desired base to produce the salt in the conventional manner.
  • Certain of the compounds of the present invention can exist in unsolvated forms as well as solvated forms, including hydrated forms. In general, the solvated forms, including hydrated forms, are equivalent to unsolvated forms and are intended to be encompassed within the scope of the present invention. Certain of the compounds of the present invention possess one or more chiral centers and each center may exist in the R(D) or S(L) configuration. The present invention includes all enantiomeric and epimeric forms as well as the appropriate mixtures thereof.
  • the compounds of the present invention can be prepared and administered in a wide variety of oral and parenteral dosage forms.
  • the compounds of the present invention can be administered by injection, that is, intravenously, intramuscularly, intracutaneously, subcutaneously, intraduodenally, or intraperitoneally.
  • the compounds of the present invention can be administered by inhalation, for example, intranasally.
  • the compounds of the present invention can be administered transdermally. It will be obvious to those skilled in the art that the following dosage forms may comprise as the active component, either a compound of Formula 1 or a corresponding pharmaceutically acceptable salt of a compound of Formula 1.
  • pharmaceutically acceptable carriers can be either solid or liquid.
  • Solid form preparations include powders, tablets, pills, capsules, cachets, suppositories, and dispersible granules.
  • a solid carrier can be one or more substances which may also act as diluents, flavoring agents, binders, preservatives, tablet disintegrating agents, or an encapsulating material.
  • the carrier is a finely divided solid which is in a mixture with the finely divided active component.
  • the active component is mixed with the carrier having the necessary binding properties in suitable proportions and compacted in the shape and size desired.
  • the powders and tablets preferably contain from five or ten to about seventy percent of the active compound.
  • Suitable carriers are magnesium carbonate, magnesium stearate, talc, sugar, lactose, pectin, dextrin, starch, gelatin, tragacanth, methylcellulose, sodium carboxymethylcellulose, a low melting wax, cocoa butter, and the like.
  • the term "preparation" is intended to include the formulation of the active compound with encapsulating material as a carrier providing a capsule in which the active component with or without other carriers, is surrounded by a carrier, which is thus in association with it. similarly, cachets and lozenges are included.
  • Tablets, powders, capsules, pills, cachets, and lozenges can be used as solid dosage forms suitable for oral administration.
  • a low melting wax such as a mixture of fatty acid glycerides or cocoa butter
  • the active component is dispersed homogeneously therein, as by stirring.
  • the molten homogenous mixture is then poured into convenient sized molds, allowed to cool, and thereby to solidify.
  • Liquid form preparations include solutions, suspensions, and emulsions, for example, water or water propylene glycol solutions.
  • liquid preparations can be formulated in solution in aqueous polyethylene glycol solution.
  • Aqueous solutions suitable for oral use can be prepared by dissolving the active component in water and adding suitable colorants, flavors, stabilizing and thickening agents as desired.
  • Aqueous suspensions suitable for oral use can be made by dispersing the finely divided active component in water with viscous material, such as natural or, synthetic gums, resins, methylcellulose, sodium carboxymethylcellulose, and other well-known suspending agents.
  • solid form preparations which are intended to be converted, shortly before use, to liquid form preparations for oral administration.
  • liquid forms include solutions, suspensions, and emulsions.
  • These preparations may contain, in addition to the active component, colorants, flavors, stabilizers, buffers, artificial and natural sweeteners, dispersants, thickeners, solubilizing agents, and the like.
  • the pharmaceutical preparation is preferably in unit dosage form. In such form the preparation is divided into unit doses containing appropriate quantities of the active component.
  • the unit dosage form can be a packaged preparation, the package containing discrete quantities of preparation, such as packeted tablets, capsules, and powders in vials or ampoules.
  • the unit dosage form can be a capsules, tablet, cachet, or lozenge itself, or it can be the appropriate number of any of these in packaged form.
  • the quantity of active component in a unit dose preparation may be varied or adjusted from 0.1 mg to 100 mg preferably 0.5 mg to 100 mg according to the particular application and the potency of the active component.
  • the composition can, if desired, also contain other compatible therapeutic agents.
  • the compounds utilized in the pharmaceutical method of this invention are administered at the initial dosage of about 0.01 mg to about 100 mg/kg daily.
  • a daily dose range of about 0.01 mg to about 10 mg/kg is preferred.
  • the dosages may be varied depending upon the requirements of the patient, the severity of the condition being treated, the compound being employed. Determination of the proper dosage for a particular situation is within the skill of the art. Generally, treatment is initiated with smaller dosages which are less than the optimum dose of the compound. Thereafter, the dosage is increased by small increments until the optimum effect under the circumstances is reached. For convenience, the total daily dosage may be divided and administered in portions during the day, if desired.
  • Scheme I shown below, illustrates the preparation of 6-substituted-3-substituted pyrones.
  • Ketone I is treated with a suitable base, such as lithium diisopropylamide or lithium bis(trimethylsilyl)amide, at -78 °C to -45 °C, in ether or THF solution and, when deprotonation is complete, quenched with chlorotrimethylsilane (TMS- Cl) , at -78 °C to 0 °C, producing the silyl enol ether II.
  • a suitable base such as lithium diisopropylamide or lithium bis(trimethylsilyl)amide
  • TMS- Cl chlorotrimethylsilane
  • compound I is treated with trimethylsilyltrifluoromethanesulfonate (TMS-OTf) and triethylamine at 0 °C in dichloromethane solution, to effect transformation to intermediate II.
  • TMS-OTf trimethylsilyltrifluoromethanesulfonate
  • Compound II is then reacted with an appropriately substituted malonate and heated either
  • reactive functional groups present in starting materials, reaction intermediates, or reaction products may be protected during chemical reactions using protecting groups which render the reactive functional groups substantially inert to the reaction conditions.
  • protecting groups See for example. Protective Groups in Organic Synthesis, 2 ed. , T. W. Green and P. G. Wuts, John Wiley & Sons, New York, NY 1991).
  • protecting groups such as the following may be utilized to protect suitable amino, hydroxyl, and other groups of related reactivity: carboxylic acyl groups, such as formyl, acetyl, trifluoroacetyl; alkoxycarbony1 groups, such as ethoxycarbonyl, t-butoxycarbonyl (BOC) , S, / 3, / 3-tri ⁇ hloroethoxycarbonyl (TCEC), ⁇ - iodoethoxycarbonyl; aryloxycarbonyl groups, such as benzyloxycarbonyl, p-methoxybenzyloxycarbony1, phenoxycarbonyl; trialkyl silyl groups, such as trimethylsilyl and t-butyldimethylsilyl (TBDMS) ; and groups such as trityl, tetrahydropyranyl, vinyloxycarbonyl, o-nitrophenylsulfenyl, diphenylphosphinyl
  • the protecting group may be removed, after completion of the synthetic reaction of interest, by procedures known to those skilled in the art.
  • the BOC group may be removed by acidolysis, the trityl group by hydrogenolysis, TBDMS by treatment with fluoride ions, and TCEC by treatment with zinc.
  • the trimethyl silyl enol ether II is reacted with malonyl dichloride in a dry solvent such as ether or THF at low temperature, preferably -78 °C to -35 °C, to give pyrone IV, which is converted to the sulfur derivative V using an appropriately substituted p- toluenethiosulfonate, as disclosed in U.S. Patent 3,931,235 (1976).
  • a dry solvent such as ether or THF
  • pyrone IV which is converted to the sulfur derivative V using an appropriately substituted p- toluenethiosulfonate, as disclosed in U.S. Patent 3,931,235 (1976).
  • the thiotosylate reagents were prepared as described by M. G. Ranasinghe and P. L. Fuchs in Syn . Comm. 18(3): 227 (1988) .
  • the requisite thiols can be prepared from the corresponding phenol via the Newman-Kwart rearrangement (see, for example, H. Kwart and H. Omura, J. Amer. Chem. Soc. 93: 7250 (1971); M. S. Newman and F. . Hetzel, Org. Synth . Coll . Vol . VI: 824 (1988) ; M. S. Newman and H. A. Karnes, J. Org. Chem . 31: 3980 (1966)) or from the corresponding iodobenzene via a nucleophilic displacement with thiourea in the presence of a nickel catalyst (K. Takagi, Chem. Letters , 1307 (1985)).
  • substituent R 6 of structure VII can be aryl, alkyl, or substituted alkyl.
  • Substituted ⁇ -ketoester VI is deprotonated with one equivalent of a suitable base, e.g. a metal hydride such as sodium hydride, in a suitable solvent, e.g. ether or THF.
  • a suitable base e.g. a metal hydride such as sodium hydride
  • a suitable solvent e.g. ether or THF.
  • a second equivalent of a stronger base e.g. an alkyllithium such as n-butyllithium or lithium diisopropylamide
  • a suitable acylating agent e.g. an amide, at 0 °C to 25 °C producing dione ester VII.
  • Compound VII may then be cyclized to the pyrone VIII in a variety of ways, e.g.
  • pyrone VIII can be further derivatized, as shown in Scheme II above.
  • Scheme IV describes the preparation of O-acyl pyrone analogues.
  • the pyrone, e.g. VIII is treated with a suitable base, e.g. a metal hydride such as sodium hydride, or an alkoxide, in a suitable solvent, e.g. THF, dioxane, or ether, and the resulting anion is reacted with an acyl chloride or other acylating agent producing the desired acyl derivative IX.
  • a suitable base e.g. a metal hydride such as sodium hydride, or an alkoxide
  • a suitable solvent e.g. THF, dioxane, or ether
  • Scheme V shown below, illustrates the preparation of several 3-alkyl pyrone derivatives. - 39 -
  • Intermediate pyrone VTII in an alcoholic medium, such as ethanol, is combined with a suitable aldehyde and a suitable nucleophile, such as HSR 9 or NH 2 R 9 , in the presence of a mixture of an acid, such as acetic acid, and a base, such as piperidine.
  • a suitable aldehyde and a suitable nucleophile such as HSR 9 or NH 2 R 9
  • the resulting mixture is heated at 60 °C to 90 °C to produce a pyrone X, which may itself be a preferred compound.
  • Nitration of pyrone VIII is effected with nitric acid, preferably fuming nitric acid in acid solution, e.g. as described in US Patent 3,206,476 (1965). Reduction of nitropyrone XII with tin and acid furnishes aminopyrone XIII. Intermediate XIII can now be elaborated into a variety of derivatives. For example, XIII may be treated with an appropriately substituted aldehyde in the presence of a reducing agent, such as sodium borohydride or, preferably, sodium cyanoborhydride, to give the N-alkylated analogues XIV. Acylation of compound XIII may be achieved via one of several routes: 1.
  • a reducing agent such as sodium borohydride or, preferably, sodium cyanoborhydride
  • Ureas such as XVI may be prepared from aminopyrone XIII by reaction with a suitable isocyanate and a base, e.g. N- methylmorpholine, in an inert solvent such as ethyl acetate.
  • 6-methyl pyrone XV I is treated with 2 equivalents of a strong base, e.g. sodium amide in liquid ammonia or lithium diisopropylamide in THF solution, followed by quenching with one of a great variety of electrophiles, e.g. alkyl halides, acylating agents, etc., furnishing pyrone XVIII (see M.P. Stammer and T.M. Harris, Tetrahedron 26: 1685 (1970)).
  • a strong base e.g. sodium amide in liquid ammonia or lithium diisopropylamide in THF solution
  • electrophiles e.g. alkyl halides, acylating agents, etc.
  • N- bromosuccinimide N- bromosuccinimide
  • XIX N- bromosuccinimide
  • Pyrone VIII is activated, e.g. by tosylation to XXIII using p-toluenesulfonyl chloride (TsCI) in pyridine.
  • TsCI p-toluenesulfonyl chloride
  • the tosylate is then reacted with a suitable sulfur nucleophile (see A.M. Bittencourt et al . , Tetrahedron , 27: 1043 (1971)) to give sulfide XXIV.
  • pyrone VIII is converted to the 4-bromo analog XXV, using a brominating agent such as phosphorous-tribromide/dimethylformamide (DMF) .
  • DMF phosphorous-tribromide/dimethylformamide
  • Scheme IX illustrates the preparation of 2H- thiopyran-2-one derivatives.
  • XXX an appropriately substituted /S-mercapto aerylate, e.g. XXX, is condensed with the desired malonyl dichloride in an inert solvent, e.g. toluene, at a temperature between 0 °C and the boiling point of the reaction solvent, to afford the thiopyran-2-one XXXI.
  • Thiopyrone XXXI may be converted to derivative XXXII under suitable conditions, e.g. by basic hydrolysis followed by decarboxylation (for example, see F. K. Splinter and H. Arold, J. PraJct. Chem . , 38: 3-4, 142-6) .
  • a thiation reagent such as Lawesson's reagent under suitable reaction conditions
  • the reaction mixture was stirred at -20 °C for 1 hr. This solution was added to the above 3-amino-6-aryl-4-hydroxy-2H-pyran-2-one followed by more N-methyl morpholine (0.918 mmol, 1.1 equivalent) . The reaction mixture was stirred at room temperature overnight. The reaction was quenched by adding brine and diluting with ethyl acetate. The organic layer was washed in succession with 1 N HC1, water, saturated sodium chloride, and was then dried over anhydrous magnesium sulfate. After evaporation of the solvents in vacuo, the crude product was purified by column chromatography (silica gel-230 to 400 mesh) to yield the desired product.
  • the (6-aryl-4-hydroxy-2-oxo-2H-pyran-3-yl)arylthio- methanes were prepared as described in Method C. Raney-Nickel (Grace 3100) was boiled in acetone for 45 minutes and the acetone was replaced with ethanol (20 ml) . The (4-hydroxy-6-substituted-2-oxo-2H-pyran- 3-yl)arylthiomethane (1.0 mmol, 1 equivalent) was added and the resulting slurry was heated to reflux overnight. The mixture was filtered through Celite and washed with hot ethanol. The filtrate was concentrated in vacuo to yield pure products.
  • Example B Dimethyl ester of [ (2-naphthalen lmethyl)thio]- propanedioic acid: The crude product was purified by silica gel chromatography (silica gel 230-400 mesh) . ** H NMR (250 MHz, DMSO-d s ) ⁇ 3.65 (s, 6 H) , 4.10 (s, 2 H) , 4.55 (s, 1 H) , 7.51 (m, 3 H) , 7.87 (m, 4 H) .
  • Example F 2-Phenoxyethyl p-Toluenethiosulfonate: ** H NMR (400 MHz, DMSO-d 6 ) ⁇ 2.41 (s, 3 H) , 3.41 (t, 2 H) , 4.13 (t, 2 H), 6.83 (d, 2 H) , 6.94 (t, 1 H) , 7.27 (t, 2 H) , 7.48 (d, 2 H) , 7.85 (d, 2 H) .
  • Example G 3-Phen l-2-propenyl p-Toluenethiosulfonate: * ⁇ NMR (400 MHZ, DMSO-d 6 ) ⁇ 2.32 (s, 3 H) , 3.93 (d, 2 H) , 6.00 (dt, 1 H) , 6.58 (d, 1 H) , 7.29 (m, 5 H) , 7.38 (d, 2 H) , 7.81 (d, 2 H) .
  • Example I Phenylbuty1 p-Toluenethiosulfonate: ** H NMR (400 MHz, DMSO-d 6 ) ⁇ 1.53 (m, 4 H) , 2.43 (s, 3 H) , 2.50 (t, 2 H) ,
  • Example K 2-[ -Methoxyphenyl]ethyl p-Toluenethiosulfonate: ** H NMR (400 MHz, DMSO-d 6 ) ⁇ 2.50 (S, 3 H) , 2.76 (t, 2 H) , 3.21 (t, 2 H), 3.71 (s, 3 H) , 6.83 (t, 2 H) , 7.03 (d, 2 H) , 7.50 (t, 2 H) , 7.82 (d, 2 H) .
  • Example L 2-(2-Chlorophenyl)ethyl p- oluenethiosulfonate: ** H NMR (400 MHZ, DMSO-d 6 ) ⁇ 2. 3 (s, 3 H) , 2.86 (t, 2 H) , 3.28 (t, 2 H) , 7.22 (m, 4 H) , 7.49 (d, 2 H) , 7.83 (d, 2 H) .
  • Toluenethiosulfonate ** H NMR (400 MHz, DMSO-d £ ) ⁇ S 2.41 (S, 3 H) , 4.28 (S, 2 H) , 5.06 (S, 2 H) , 6.87 (d, 2 H) , 7.13 (d, 2 H) , 7.37 (m, 7 H) , 7.72 (d, 2 H) .
  • the mixture was allowed warm to ambient temperature where it was stirred for 14 h before being quenched with 2.0 N HC1.
  • the product was extracted with ethylacetate (3 x 50 mL) , the layers combined, dried with Na 2 S0 4 , and the solvent removed in vacuo . The residue was then treated with cone. H 2 S0 4 (20 mL) and the resulting mixture stirred for 18 h at room temperature before being diluted with H 2 0 (200 mL) .
  • the product was then extracted with ethylacetate (3 x 100 mL) being sure to collect all solids.
  • the layers were then combined and diluted with acetone to provide a homogenous solution which was dried with Na 2 S0 4 .
  • the title compound (1.56 g, m.p. 247 - 249 °C) was prepared in a similar manner as that demonstrated in the preparation of Example N using the following: 60% NaH (0.904 g, 22.6 mmol), THF (50 mL) , ethyl acetoacetate (3.00 g, 22.6 mmol), lithium diisopropylamine in THF (39.8 mL, 24 mmol), 4-chloro- N-methoxy-N-methylbenzamide (3.73 g, 22.6 mmol), 90% H 2 S04 (20 mL) .
  • Example P (cyclopropylmethyl)-p-toluenethiosulfonate.
  • methylcyclopropyl bromide (4.00 g, 29.6 mmol) in ethanol (20.0 mL) was added potassium thiotosylate (10.0 g, 44.4 mmol) and the mixture heated to 90 °C for 10 h.
  • the mixture was then quenched into a 1 : 1 mixture of H 2 0 (50.0 mL) and diethyl ether (50.0 mL) .
  • the layers were separated and the organic layer washed with brine (50.0 mL) .
  • the resulting silyl enol ether was then transferred to a flask containing diethyl -2- (thiobenzyl)propane-l,3-dioate (1.63 g, 5.80 mmol), the resulting mixture heated to 160 °C for 16 h. and then allowed to cool to room temperature where it was diluted with diethyl ether (20 mL) and extracted with saturated Na 2 C0 3 (3 x 20 mL) . The aqueous layer was then acidifed with cone. HC1 to pH 0 and then extracted with ethyl acetate (3 x 100 mL) . The organic layers were combined, dried with Na 2 S04 and the solvent removed in vacuo.
  • Example 4 4-Hydroxy-6-(3-methoxyphenyl)-3-[ (phenylmethyl)thio]- 2H-pyran-2-one.
  • the title compound (0.400 g, m.p. 146 - 147 °C) was prepared by method A using 3'- methoxyacetophenone (1.5 L, 10.9 mmol), potassium hexamethyldisilazide (6.41 mL, 12.0 mmol), trimethylsilylchloride (1.38 mL, 10.9 mmol), THF (10.0 mL) , diethyl 2-(thiobenzyl)propane-l,3-dioate (1.23 g, 4 . 36 mmol) .
  • Example 5 4-Hydroxy-3-[(phenylmethyl)thio]-6-(3,4,5- trimethoxyphenyl)-2H-pyran-2-one.
  • the title compound (0.385 g, m.p. 156 - 157 °C) was prepared by method A using 3 ' , A ' , ⁇ '-trimethoxyacetophenone (2.0 g, 9.5 mmol), potassium hexamethyldisilazide (5.6 mL, 10.45 mmol), trimethylsilylchloride (1.2 mL, 9.5 mmol), THF (15 mL) , diethyl 2-(thiobenzyl)propane-l,3-dioate (1.07 g, 3.80 mmol).
  • Example 7 6-(4-Chloropheny1)-4-hydroxy-3-[(2-phenylethyl)thio]- 2H-pyran-2-one.
  • the title compound (0.242 g, m.p. 161 - 163 °C) was prepared by method B using 6-(4- chloropheny1)-4-hydroxy-2H-pyran-2-one (0.250 g, 1.12 mmol), phenethyl-p-toluenethiosulfonate (0.390 g, 1.35 mmol), triethylamine (0.31 mL, 2.24 mmol), ethanol (10.0 mL) .
  • Example 8 4-Hydroxy-6-phenyl-3-[(phenylmethyl)] hio]-2H-pyran-2- one: The title compound was prepared by Method A using 1-phenyl-l-(tri ethylsilyloxy)ethylene (1.00 g, 5.19 mmol) and the diethyl ester of [ (phenylmethyl)thio]- propandioic acid (0.977 g, 3.46 mmol). m.p.
  • Example 11 4-Hydroxy-3-[ (2-naphthalenylmethyl)thio]-6-phenyl- 2H-pyran-2-one: The title compound was prepared by Method A using l-phenyl-l-(trimethylsilyloxy)ethylene (0.475 g, 2.46 mmol) and dimethyl ester of [ (2- naphthalenylmethyl)thio]propanedioic acid (0.500 g, 1.64 mmol). m.p. dec>250 °C; * ⁇ NMR (250 MHz, DMSO-d fi ) ⁇ 4.06 (S, 2 H) , 6.47 (s, 1 H) , 7.46 (m, 6 H) , 7.78 ( , 6 H) .
  • Example 12 4-Hydroxy-3-[(2-naphthalenylthio]-6-phenyl- 2H-pyran-2-one: The title compound was prepared by Method A using l-phenyl-l-(trimethylsilyloxy) ethylene (1.33, 6.90 mmol) and diethyl ester of [ (2- naphthalenyl)thio]-propanedioic acid (2.00 g, 6.29 mmol). m.p. dec. 246 °C; ** H NMR (250 MHz, DMSO-d 6 ) ⁇ 6.95 (Sl), 7.38 (m, 3 H) , 7.56 (m, 4 H) , 7.85 (m, 5 H) .
  • Example 13 4-Hydroxy-3-[ (phenylmethyl)thio]-6- (2,4,6-trimethylphenyl)-2H-pyran-2-one: The title compound was prepared by Method A using 2' ,4',6'- trimethylacetophenone (1.86 g, 11.5 mmol), lithium bis(trimethylsilyl)amide (2.11 g, 12.65 mmol), chlorotrimethylsilane (1.60 mL, 12.65 mmol), THF (127 mL) , and diethyl ester of [ (phenylmethyl)thio]propanedioic acid (2.95 g, 10.4 mmol). m.p.
  • Example 15 4-Hydroxy-6-(2-naphthaleny1)-3-[(phenylmethyl)thio]- 2H-pyran-2-one:
  • the title compound was prepared by Method A using 2-acetyl naphthalene (1.97 g, 11.6 mmol), lithium bis(trimethylsilyl)amide (2.13 g, 12.76 mmol), chlorotrimethylsilane (1.61 mL, 12.76 mmol), THF (127 mL) , and diethyl ester of [ (phenylmethyl)thio]-propanedioic acid (2.90 g, 10.5 mmol). m.p. dec.
  • 2H-pyran-2-one The title compound was prepared by Method C using 4-hydroxy-6-phenyl-2H-pyran-2-one (1.00 g, 5.31 mmol), ethanol (10 mL) , paraformaldehyde (0.175 g, 5.80 mmol), thiophenol (1.40 mL, 13.8 mmol), piperdine (0.5 mL) , acetic acid (0.5mL). m.p. dec.
  • Example 19 4-Hydroxy-6-(4-methylphenyl)-3-[ (phenylmethyl)thio]- 2H-pyran-2-one :
  • the title compound was prepared by Method A using 4 '-methylacetophenone (0.712 g, 5.31 mmol), lithium bis(trimethylsilyl)amide (0.977 q, 5.84 mmol), chlorotrimethylsilane (0.741 mL, 5.84 mmol), THF (58 mL) , and diethyl ester of [ (phenylmethyl)thio]-propanedioic acid (1.00 g, 3.54 mmol). m.p. dec.
  • 2H-pyran-2-one The title compound was prepared by Method D using 3-amino-4-hydroxy-6-phenyl-2H-pyran-2- one hydrochloride (0.150 g, 0.626 mmol), 1% acetic acid in dimethyIformamide (7 mL) , benzaldehyde (0.133 mL, 1.33 mmol), sodium cyanoborohydride (0.083 g, 1.31 mmol). m.p.
  • Example 21 4-Hydroxy-6-phenyl-3-[(2-phenylethyl) hio]- 2H-pyran-2-one: The title compound was prepared by Method B using 4-hydroxy-6-phenyl-2H-pyran-2-one (0.500 g, 2.65 mmol), ethanol (7 mL) , IN sodium hydroxide (2.65 mL) , 2-phenylethyl-p- toluenethiosulfonate (0.770 g, 2.65 mmol). m.p.
  • 2H-pyran-2-one The title compound was prepared by Method B using 4-hydroxy-6-phenyl-2H-pyran-2-one (0.500 g, 2.65 mmol), ethanol (7 mL) , IN sodium hydroxide (2.65 mL, 2.65 mmol), 2-phenoxyethyl-p- toluenethiosulfonate (0.816 g, 2.65 mmol). m.p.
  • Example 24 4-Hydroxy-6-(2-meth lphenyl)-3-[(phenylmethyl)thio]- 2H-pyran-2-one: The title compound was prepared by Method A using 2 '-methylacetophenone (0.712 g, 5.31 mmol), lithium bis(trimethylsilyl)amide (0.977 g, 5.84 mmol), chlorotrimethylsilane (0.741 mL, 5.84 mmol), THF (58 mL) , and diethyl ester of [ (phenylmethyl)thio]propanedioic acid (1.00 g, 3.54 mmol).
  • - ⁇ NMR 400 MHz, DMS0-d 6 ) ⁇ S 2.34 (s, 3 H) , 4.01 (S, 2 H) , 6.32 (s, 1 H) , 7.32 (m, 9H) .
  • Example 25 4-Hydroxy-6-(2-phenylethyl)-3-[(phenylmethyl)thio]- 2H-pyran-2-one: The title compound was prepared by Method A using 4-phenethylacetophenone (0.786 g, 5.31 mmol), lithium bis(trimethylsilyl)amide (0.977 g, 5.84 mmol), chlorotrimethylsilane (0.741 mL, 5.84 mmol), THF (58 mL) , and diethyl ester of [ (phenylmethyl)thio]propanedioic acid (1.00 g, 3.54 mmol). m.p.
  • Example 26 4-Hydroxy-6-(3-hydroxyphenyl)-3-[(phenylmethyl)thio]- 2H-pyran-2-one :
  • the title compound was prepared by Method A using 3'-hydroxyacetophenone (0.722 g, 5.31 mmol), lithium bis(trimethylsilyl)amide (1.95 g, 11.6 mmol), chlorotrimethylsilane (1.48 mL, 11.6 mmol), THF (116 mL) , and diethyl ester of
  • Example 27 4-Hydroxy-6-(4-hydroxyphenyl)-3-[ (phenylethyl)thio]- 2H-pyran-2-one :
  • the title compound was prepared by Method A using 4'-hydroxyacetophenone (0.688 g, 5.06 mmol), lithium bis(trimethylsilyl)amide (1.84 g, 11.1 mmol), chlorotrimethylsilane (1.41 mL, 11.1 mmol), THF (111 mL) , and diethyl ester of [ (2- phenylethyl)thio]propanedioic acid (1.00 g, 3.37 mmol).
  • Example 28 4-Hydroxy-6-phenyl-3-[3-(pheny1-2-propenyl)thio]- 2H-pyran-2-one, ⁇ E) -
  • the title compound was prepared by Method B using 4-hydroxy-6-phenyl-2H-pyran-2-one (0.500 g, 2.65 mmol), ethanol (7 mL) , IN sodium hydroxide (2.65 mL) , 3-phenyl-2-propenyl-p- toluenethiosulfonate (0.808 g, 2.65 mmol). m.p.
  • Example 29 4-Hydroxy-3-[(2-phenylethyl)thio]-6-[4- (phenylmethoxy)phenyl]-2H-pyran-2-one :
  • the title compound was prepared by Method A using 4'- benzyloxyacetophenone (1.14 g, 5.06 mmol), lithium bis(trimethylsilyl)amide (0.930 g, 5.56 mmol), chlorotrimethylsilane (0.705 mL, 5.56 mmol), THF (57 mL) , and diethyl ester of [ (2- phenylethyl)thio]propanedioic acid (1.00 g, 3.37 mmol). m.p. 139-142 °C; ** H NMR (400 MHz, DMSO-d 6 ) ⁇ "
  • Example 32 Hydroxy-6-(2-hydroxyphenyl)-3-[ (phenylmethyl)thio]- 2H-pyran-2-one: The title compound was prepared by Method A using 2'-hydroxyacetophenone (0.722 g, 5.31 mmol), lithium bis(trimethylsilyl)amide (1.95 g, 11.6 mmol), chlorotrimethylsilane (1.48 mL, 11.6 mmol), THF (116 mL) , and diethyl ester of
  • Example 33 4-Hydroxy-6-[3-(2-phenylethoxy)phenyl]-3-[ (2-phenyl- ethyl)thio]-2H-pyran-2-one:
  • the title compound was prepared by Method A using 3'-(2-phenylethoxy)- acetophenone (0.336 g, 1.40 mmol), lithium bis(trimethylsilyl)amide (0.257 g, 1.54 mmol), chlorotrimethylsilane (0.195 mL, 1.54 mmol), THF (15 mL) , and diethyl ester of [ (2-phenylethyl)thio]- propanedioic acid (0.417 g, 1.40 mmol). m.p.
  • Example 34 4-Hydroxy-6-phenyl-3-[phenyl(phenylthio)methyl]- 2H-pyran-2-one ,(+/-)-:
  • the title compound was prepared by Method E using 4-hydroxy-6-phenyl-2H- pyran-2-one (1.00 g, 5.31 mmol), ethanol (10 mL) , benzaldehyde (0.593 mL, 5.84 mmol), thiophenol (1.40 mL, 13.8 mmol), piperdine (0.5 mL) , acetic acid (0.5mL). m.p. dec.
  • Example 35 4-Hydroxy-3-[[2-(2-methoxyphenyl)ethyl]thio]-6-pheny1- 2H-pyran-2-one: The title compound was prepared by Method B using 4-hydroxy-6-phenyl-2H-pyran-2-one (0.500 g, 2.65 mmol), ethanol (7 mL) , IN sodium hydroxide (2.65 mL) , 2-(2-methoxyphenyl)ethyl p- toluenethiosulfonate (0.856 g, 2.65 mmol). m.p.
  • Example 36 4-Hydroxy-6-phen l-3-[ ( -phenylbuty1)thio]- 2H-pyran-2-one: The title compound was prepared by Method B using 4-hydroxy-6-phenyl-2H-pyran-2-one (0.500 g, 2.65 mmol), ethanol (7 mL) , IN sodium hydroxide (2.65 mL) , 4-phenylbuty1-p- toluenethiosulfonate (0.851 g, 2.65 mmol) . m.p.
  • Example 37 4-Hydroxy-3-[[2-(3-methoxyphenyl)ethyl]thio]-6-phenyl- 2H-pyran-2-one: The title compound was prepared by Method B using 4-hydroxy-6-phenyl-2H-pyran-2-one (0.500 g, 2.65 mmol), ethanol (7 mL) , IN sodium hydroxide (2.65 mL), 2-(3-methoxyphenyl)ethyl-p- toluenethiosulforiate (0.856 g, 2.65 mmol). m.p. 112-113 °C; X H NMR (400 MHz, DMS0-d 6 ) ⁇ 2.75 (t, 2 H) ,
  • Example 38 Hydroxy-3-[[2-(4-methoxyphenyl)ethyl]thio]-6-pheny1- 2H-pyran-2-one: The title compound was prepared by Method B using 4-hydroxy-6-phenyl-2H-pyran-2-one (0.500 g, 2.65 mmol), ethanol (7 mL) , IN sodium hydroxide (2.65 mL) , 2-(4-methoxyphenyl)ethyl -p- toluenethiosulfonate (0.856 g, 2.65 mmol). m.p.
  • Example 39 3-[[2-(3-Chlorophenyl)ethyl]thio]-4-hydroxy-6-phenyl- 2H-pyran-2-one:
  • the title compound was prepared by Method B using 4-hydroxy-6-phenyl-2H-pyran-2-one (0.500 g, 2.65 mmol), ethanol (7 mL) , IN sodium hydroxide (2.65 mL) , 2-(2-chlorophenyl)ethyl-p- toluenethiosulfonate (0.868 g, 2.65 mmol) . m.p. 133-134 °C; * ⁇ NMR (400 MHZ, DMS0-d 6 ) ⁇ 2.79 (t, 2 H) ,
  • the title compound was prepared by Method F using Raney-Nickel (Grace 3100) , ethanol (15 mL) , 4-hydroxy- 6-phenyl-3-[3-phenyl-l-(phenylthio)propyl]-2H-pyran-2- one ( 0.150 g, 0.362 mmol). m.p. 195-196 °C; * ⁇ NMR (400 MHZ, DMSO-d 6 ) ⁇ 1.73 (m, 2 H) , 2.40 (t, 2 H) , 2.60 (t, 2 H) , 6.68 (s, 1 H) , 7.23 (m, 5 H) , 7.52 (m, 3 H) , 7.74 (m, 2 H) .
  • Example 42 6-(2,6-Dimeth lphen l)-4-hydroxy-3-[ (phenylmethyl)thio ]-2H-pyran-2-one:
  • the title compound was prepared by Method A using 2',6'-dimethyl acetophenone (0.785 q, 5.31 mmol), lithium bis(trimethylsilyl)amide (O.977 q, 5.84 mmol), chlorotrimethylsilane (0.741 mL, 5.84 mmol) , THF (58 mL) , and diethyl ester of [ (phenylmethyl)thio]propanedioic acid (1.00 g, 3.54 mmol). m.p.
  • Example 43 4-Hydroxy-6-[2-hydroxy-3-methyl-4-(phen lmethoxy) phenyl]-3-[(2-phenylethyl)thio]-2H-pyran-2-one:
  • the title compound was prepared by Method A using 4'- benzyloxy-2'-hydroxy-3'-methylacetophenone (1.29 g, 5.06 mmol), lithium bis(trimethylsilyl)amide (2.11 g, 12.6 mmol), chlorotrimethylsilane (1.60 mL, 12.6 mmol), THF (127 mL) , and diethyl ester of [ (2- phenylethyl)thio]propanedioic acid (1.00 g, 3.37 mmol).
  • Example 44 4-Hydroxy-3-[ (2-phenylethyl)thio]-6-[3-(phen lmethoxy) phenyl]-2H-pyran-2-one:
  • the title compound was prepared by Method A using 3 '-benzyloxyacetophenone (1.14 g, 5.06 mmol), lithium bis(trimethylsilyl) amide (0.930 g, 5.56 mmol), chlorotrimethylsilane (0.705 mL, 5.56 mmol), THF (57 mL) , and diethyl ester of [ (2- phenylethyl)thio]propanedioic acid (1.00 g, 3.37 mmol). m.p.
  • Example 45 4-Hydroxy-6-[-4-(2-naphthalenylmethoxy)phenyl]-3- [ (2-phenylethyl)thio]-2H-pyran-2-one:
  • the title compound was prepared by Method A using 4'-(2- naphthalenylmethoxy)acetophenone (1.39 q, 5.06 mmol), lithium bis(trimethylsilyl)amide (0.930 g, 5.56 mmol), chlorotrimethylsilane (0.705 mL, 5.56 mmol), THF (57 mL) , and diethyl ester of [ (2- phenylethyl)thio]propanedioic acid (1.00 g, 3.37 mmol). m.p.
  • Example 48 4-Hydroxy-6-(3-methylphenyl)-3-[(phenylmethyl) hio]- 2H-pyran-2-one: This compound was prepared by the condensation of the diethyl ester of [ (phenylmethyl)thio]-propanedioic acid (1 g, 3.54 mmol) with the corresponding trimethylsilyl enol ether of 3'-methyl acetophenone (7.09 mmol, l.46g) as described in general procedure A. Isolated Yield: 65% m.p.
  • Example 51 4-Hydroxy-6-( -hydroxy-2-methylpheny1)-3-[2- phenylethyl)thio]-2H-pyran-2-one : This compund is prepared by the condensation of diethyl ester of [ (phenylethyl)thio]propanedioic acid (1 g, 3.38 mmol) with the corresponding trimethylsilyl enol ether of
  • Example 53 2- ⁇ xo-6-phenyl-3-[ (phenylmethyl)thio]-2H-pyran-4- ylacetic acid ester: This compound was prepared by the treatment of sodium salt of 4-hydroxy-6-phenyl-3- [ (phenylmethyl)thio]-2H-pyran-2-one, (310 mg, 1.00 mmol) with acetyl chloride (188mg, 2.4 mmol) as described in general procedure G. Isolated yield: 72%.
  • Example 54 2- ⁇ xo-6-phenyl-2H-pyran-4-yl-l-naphthalenecarboxylic acid ester: This compound was prepared by Method G using 4-hydroxy-6-phenyl-2H-pyran-2-one (0.250 g, 1.32 mmol), THF (15 mL) , 60% sodium hydride (0.585 g, 1.46 mmol), l-naphthoyl chloride (0.278 g, 1.46 mmol). m.p.
  • Example 55 3,3'-Thiobis[4-hydroxy-6-phenyl-2H-pyran-2-one]: This compound was synthesized by the following method: 4-hydroxy-6-phenyl-2H-pyran-2-one (0.250 q, 1.33 mmol) was gradually added to thionyl chloride (0.585 ml). The reaction was allowed to stir at room temperature overnight. The unreacted thionyl chloride was removed in vacuo and residue was recrystallized from boiling methanol. m.p. >240°C; * -H NMR (250 MHz, d-TFA) ⁇ 7.03 (S, 2 H) , 7.56 (m, 6 H) , 7.89 (m, 4 H) .
  • Example 57 3-Benzoyl-4-hydroxy-6-phenyl-2H-pyran-2-one: To a solution of ethyl benzoylacetate (150 g, 0.88 mmol) in 1,2-dichlorobenzene (150mL) was added a trace amount of sodium bicarbonate. The reaction mixture was heated to reflux. A distillate of ethanol (approximately 20mL) was collected. The reaction mixture was cooled to 0 °C. Ether (lOOmL) was added to induce crystallization. The reaction mixture was kept in the refrigerator overnight. The solid formed was collected and washed with ether: m.p. 171-173 °C; **H NMR (250 MHz , DMSO-d 6 ) ⁇ 6.91 (s, 1 H) , 7.59 (m, 6 H), 7.87 (m, 4 H).
  • Example 58 N-(4-Hydroxy-2-oxo-6-phenyl-2H-pyran-3-yl)benzene- acetamide: The title compound was prepared by Method E using 3-amino-4-hydroxy-6-phenyl-2H-pyran-2-one hydrochloride (0.150 g, 0.626 mmol), methylene chloride (6 mL) , triethylamine (0.348 mL, 2.50 mmol), catalytic 4-dimethylaminopyridine, phenacetyl chloride (0.106 g, 0.626 mmol). m.p. dec.
  • 2- ⁇ xo-6-phenyl-2H-pyran-4-yl-2-naphthalenecarboxylic acid ester The title compound was prepared by Method G using 4-hydroxy-6-phenyl-2H-pyran-2-one (0.200 g, 0.835 mmol), methylene chloride (8 mL) , triethylamine (0.348 mL, 2.50 mmol) , catalytic 4- dimethylaminopyridine, 2-naphthoyl chloride (0.175 q, 0.918 mmol). m.p.
  • Example 60 3-[Bis(2-naphthalenylmethyl) mino]-4-hydroxy-6-phenyl- 2H-pyran-2-one: The title compound was prepared by Method D using 3-amino-4-hydroxy-6-phenyl-2H-pyran-2- one hydrochloride (0.250 g, 1.04 mmol), 1% acetic acid in dimethylformamide (10 mL) , 2-naphthaldehyde (0.407 g, 2.60 mmol), sodium cyanoborohydride (0.164 g, 2.60 mmol). m.p. dec. 209; * ⁇ NMR (250 MHz, DMS0-d 6 ) ⁇ 4.46 (S, 4 H) , 6.38 (S, 1 H) , 7.44 (m, 8H) , 7.77 (m, 13H) .
  • 2-naphthaleneacetamide The title compound was prepared by Method E using 3-amino-4-hydroxy-6-phenyl- 2H-pyran-2-one hydrochloride (0.200 g, 0.835 mmol), THF (9 mL) , 60 % sodium hydride (0.037 mL, 0.918 mmol), oxalyl chloride (0.080 mL, 0.918 mmol), 2- naphthalyl acetic acid (0.170 g, 0.918 mmol). m.p. dec.
  • Example 62 N-(4-Hydroxy-2-oxo-6-phenyl-2H-pyran-3-yl)- 2-naphthalenecarboxamide: The title compound was prepared by Method E using 3-amino-4-hydroxy-6-phenyl- 2H-pyran-2-one hydrochloride (0.150 g, 0.626 mmol), THF (6 mL) , 60 % sodium hydride (0.028 mL, 0.688 mmol), 2-naphthoyl chloride (0.131 g, 0.688 mmol). m.p. dec.
  • Example 63 (4-Hydroxy-2-oxo-6-phenyl-2H-pyran-3-yl)benzene- propanamide: The title compound was prepared by Method E using 3-amino-4-hydroxy-6-phenyl-2H-pyran-2-one hydrochloride (0.150 g, 0.626 mmol), THF (6 mL) , 60 % sodium hydride (0.028 mL, 0.688 mmol), hydrocinnamyl chloride (0.131 g, 0.688 mmol). m.p. 191-193 °C; - ⁇
  • Example 65 6-[4-(Benzoyloxy)phenyl]-4-hydroxy-3-[(phenylmethyl) thio]-2H-pyran-2-one:
  • the title compound was prepared by Method A using 4'-benzoyloxyacetophenone (1.27 g, 5.31 mmol), lithium bis(trimethyl-silyl)amide (0.977 g, 5.84 mmol), chlorotrimethyl-silane (0.741 mL, 5.84 mmol) , THF (58 mL) , and diethyl ester of [ (phenylmethyl)thio]propanedioic acid (1.00 g, 3.54 mmol). m.p. dec.
  • Example 68 4-Hydroxy-6-[4-[(2-methoxyphenyl)methoxy]phenyl]-3- [ (2-phenylethyl)thio]-2H-pyran-2-one: The title compound was prepared by Method A using 4'-[(2- methoxyphenyl)methoxy]phenylacetophenone (1.29 g, 5.06 mmol), lithium bis(trimethylsilyl)amide (0.930 g, 5.56 mmol), chlorotrimethylsilane (0.705 mL, 5.56 mmol), THF (56 mL) , and diethyl ester of [ (2- phenylethyl)thio]propanedioic acid (1.00 g, 3.37 mmol). m.p. 138-139 °C; ** H NMR (400 MHz, DMS0-d 6 ) ⁇
  • the title compound was prepared by Method A using 4'- [ (2-methoxyphenyl)methoxy]-3'-methylacetophenone (1.36 g, 5.06 mmol), lithium bis(trimethylsilyl)amide (0.930 g, 5.56 mmol), chlorotrimethylsilane (0.705 mL, 5.56 mmol), THF (56 mL) , and. diethyl ester of [ (2- phenylethyl)thio]propanedioic acid (1.00 g, 3.37 mmol). m.p. dec.
  • Example 71 4-Hydroxy-6-(4-phenoxyphenyl)-3-[ (2-phenylethyl)thio]- 2H-pyran-2-one: The title compound was prepared by Method A using 4 -phenoxyacetophenone (1.07 g, 5.06 mmol), lithium bis(trimethylsilyl)amide (0.930 q , 5.56 mmol), chlorotrimethylsilane (0.705 L, 5.56 mmol), THF (56 mL) , and diethyl ester of [ (2- phenylethyl)thio]propanedioic acid (1.00 q, 3.37 mmol). m.p. 127-128 °C; * ⁇ NMR (400 MHz, DMSO-d 6 ) ⁇
  • Example 72 4-Hydroxy-6-phenyl-3-[[[4-(phenylmethoxy)phenyl] methyl]thio]-2H-pyran-2-one: The title compound was prepared by Method B using 4-hydroxy-6-phenyl-2H- pyran-2-one (0.500 g, 2.65 mmol), ethanol (7 mL) , IN sodium hydroxide (2.65 mL) , [4-
  • Example 73 4-Hydroxy-3-[(2-phenylethyl)thio]-6- [4-(2-pyridin lmethoxy) henyl]-2H-pyran-2-one:
  • the title compound was prepared by Method A using 4'-(2- pyridinylmethoxy)acetophenone (1.14 g, 5.06 mmol), lithium bis(trimethylsilyl)amide (0.930 g, 5.56 mmol), chlorotrimethylsilane (0.705 mL, 5.56 mmol), THF (56 mL) , and diethyl ester of [ (2-phenylethyl)thio]- propanedioic acid (1.00 g, 3.37 mmol). m.p.
  • Example 74 4-[4-Hy roxy-2-oxo-3-[(2-phenylethyl)thio]- 2H-pyran-6-yl]phenoxy acetic acid ethyl ester: To a methanol solution (3 ml) of the 4-hydroxy-
  • the reaction is quenched by dilution with ethyl acetate (100 mL) .
  • the organic layer is washed in succession with; 1 N HC1, water, saturated sodium chloride; dried over anhydrous magnesium sulfate.
  • the crude product was purified by flash column chromatography (SiO 2 -230 to 400 mesh) using a gradient of 15% ethyl acetate/hexanes to 50% ethyl acetate/hexanes to 30% ethyl acetate/30% hexanes/40% methylene chloride.: m.p.
  • Example 75 Hydroxy-3-[2-naphthaleny1(phenylthio)methyl]-6- phenyl-2H-pyran-2-one:
  • the title compound was prepared by Method C using 4-hydroxy-6-phenyl-2H- pyran-2-one (1.00 g, 5.31 mmol), ethanol (10 mL) , 2- naphthaIdehyde (0.912 g, 5.84 mmol), thiophenol (1.40 mL, 13.8 mmol), piperdine (0.5 mL) , acetic acid (0.5mL). m.p.
  • Example 76 4-Hydroxy-3-[ (2-naphthalenylthio)phenylmethyl]-6- phenyl-2H-Pyran-2-one: The title compound was prepared by Method C using 4-hydroxy-6-phenyl-2H-pyran-2-one (1.00 g, 5.31 mmol), ethanol (10 mL) , benzaldehyde (0.593 mL, 5.84 mmol), 2-naphthalenethiol (2.21 gL, 13.8 mmol), piperdine (0.5 mL) , acetic acid (0.5mL). m.p. dec.
  • Example 77 4-[4-Hydroxy-2-oxo-3-[(2-phenylethyl)thio]-2H- pyran-6-yl]phenoxyacetic acid: To a tetrahydrofuran (10 ml) solution of 4-[4-hydroxy-2-oxo- 3-[ (2-phenylethyl)thio]-2H-pyran-6-yl]phenoxyacetic acid, ethyl ester (0.939 mmol) was added IN sodium hydroxide (2.34 mmol). The reaction was stirred for 5 hrs, and then quenched by addition of water (10 ml) followed by acidification with cone, hydrochloric acid to pH 2.
  • Example 78 4-Hydroxy-3-[(2-phenylethyl)thio]-6- [4-(3-pyridinylmethoxy)phenyl]-2H-pyran-2-one: The title compound was prepared by Method A using 4'- (3-pyridinylmethoxy)acetophenone (1.14 g, 5.06 mmol), lithium bis(trimethylsilyl)amide (0.930 g, 5.56 mmol), chlorotrimethylsilane (0.705 mL, 5.56 mmol), THF (56 mL) , and diethyl ester of [ (2-phenylethyl)thio]pro ⁇ panedioic acid (1.00 q, 3.37 mmol). m.p.
  • Example 80 4-Hydroxy-3-[(2-phenylethyl)thio]-6-[4- (phenylsulfonyl)phenyl]-2H-pyran-2-one: The title compound was prepared by Method A using 4'- (phenylsulfonyl)acetophenone (2.50 g, 9.61 mmol), lithium bis(trimethylsilyl)amide (2.41 g, 14.42 mmol), chlorotrimethylsilane (1.83 mL,14.42 mmol), THF (96 mL) , and diethyl ester of [ (2- phenylethyl)thio]propanedioic acid (1.00 g, 3.37 mmol). m.p.
  • Example 84 3-[1,4-Bis(phenylthio)butyl]-4-hydroxy-6-phenyl- 2H-pyran-2-one, (+/-) :
  • the title compound was prepared by Method C using 4-hydroxy-6-phenyl-2H- pyran-2-one (1.00 g, 5.31 mmol), ethanol (10 mL) , cyclopropyl carboxaIdehyde (0.436 mL, 5.84 mmol), thiophenol (1.40 mL, 13.8 mmol), piperdine (0.5 mL) , acetic acid (0.5mL). m.p.
  • Example 86 4-Hydroxy-3-[[ (2-methoxyphenyl)thio]phenylmethyl]-6- phenyl-2H-pyran-2-one, (+/-)
  • the title compound was prepared by Method C using 4-hydroxy-6-phenyl-2H- pyran-2-one (1.00 q, 5.31 mmol), ethanol (10 mL) , benzaldehyde (0.593 mL, 5.84 mmol) , 2- methoxythiophenol (1.93 mL, 13.8 mmol), piperdine (0.5 mL) , acetic acid (0.5mL) . m.p. 165-170 °C; * ⁇ NMR (400 MHZ, DMSO-d 6 ) ⁇ 3.870 (S, 3 H) , 5.81 (s, 1 H) , 6.70.
  • Example 88 3-[2-Cyclohex 1-1-(phenylthio)ethyl]-4-hydroxy-6- phenyl-2H-pyran-2-one, (+/-)
  • the title compound was prepared by Method C using 4-hydroxy-6-phenyl-2H- pyran-2-one (1.00 g, 5.31 mmol), ethanol (10 mL) , cyclohexylmethyl carboxaldehyde (0.735 mL, 5.84 mmol), thiophenol (1.40 mL, 13.8 mmol), piperdine (0.5 mL) , acetic acid (0.5mL). m.p. dec.
  • Example 89 4-Hydroxy-6-(3-phenoxyphenyl)-3-[(2-phenylethyl)thio]- 2H-pyran-2-one:
  • the title compound was prepared by Method A using 3'-phenoxyacetophenone (2.00 g, 9.43 mmol), lithium bis(trimethylsilyl)amide (2.36 q, 14.15 mmol), chlorotrimethylsilane (1.79 mL, 14.15 mmol), THF (100 mL) , and diethyl ester of [ (2- phenylethyl)thio]-propanedioic acid (1.00 g, 3.37 mmol).
  • Example 90 4-Hydroxy-6-[3-methoxy-4-(phenylmethoxy)phenyl]-3-[(2- phenylethyl)thio]-2H-pyran-2-one:
  • the title compound was prepared by Method A using 4'-benzyloxy-3'- methoxyacetophenone (2.00 g, 7.81 mmol), lithium bis(trimethylsilyl)amide (1.96 g, 11.71 mmol), chlorotrimethylsilane (1.48 mL, 11.71 mmol), THF (80 mL) , and diethyl ester of [ (2- phenylethyl)thio]propanedioic acid (1.00 g, 3.37 mmol). m.p.
  • Example 91 6-(3,5-Dimethylphenyl)-4-hydroxy-3-[ (2- phenylethyl)thio]-2H-pyran-2-one:
  • the title compound was prepared by Method A using 3',5'-dimethyl acetophenone (1.75 g, 11.82 mmol), lithium diisopropylamide (1.89 g, 17.73 mmol), chlorotrimethylsilane (2.25 mL, 17.73 mmol), THF (120 mL) , and diethyl ester of [ (2-phenylethyl)thio]- propanedioic acid (1.00 q, 3.37 mmol). m.p.
  • Example 92 4-Hydroxy-3-[[(3-methoxyphenyl)methyl]thio]-6-phenyl- 2H-pyran-2-one: The title compound was prepared by Method B using 4-hydroxy-6-phenyl-2H-pyran-2-one (1.00 g, 5.31 mmol), ethanol (15 mL) , IN sodium hydroxide (5.31 mL) , [3-(methoxy)phenyl]methyl p- toluenethiosulfonate (2.12 g, 6.90 mmol). m.p.
  • Example 93 4-Hydroxy-3-[4-methyl-l-(phenylthio)pentyl]-6-phenyl- 2H-pyran-2-one, (+/-)
  • the title compound was prepared by Method C using 4-hydroxy-6-phenyl-2H- pyran-2-one (1.00 q, 5.31 mmol), ethanol (10 mL) , 4- methylpentanal (0.584 mL, 5.84 mmol), thiophenol (1.40 mL, 13.8 mmol), piperdine (0.5 mL) , acetic acid (0.5mL). m.p. 144-145 °C; ** H NMR (400 MHz, DMS0-d 6 ) ⁇ 0.80 (d, 3 H) , 0.81 (d, 3 H) , 1.07 ( , 1 H) , 1.18
  • Example 95 3-[ (l,3-Benzodioxol-5-ylmethyl) hio]-4-hydroxy-6- phenyl-2H-pyran-2-one :
  • the title compound was prepared by Method B using 4-hydroxy-6-phenyl-2H- pyran-2-one (1.00 g, 5.31 mmol), ethanol (15 mL) , IN sodium hydroxide (5.31 mL) , l,3-benzodioxoyl-5-yl methyl p-toluenethiosulfonate (2.22 g, 6.90 mmol). m.p. 162-164 °C; * ⁇ NMR (400 MHz, DMSO-d 6 ). ⁇ 3.92 (s, 2 H) , 5.95 (S, 2 H) , 6.75 (m, 4 H) , 7.53 (m, 3 H) , 7.79 (m, 2 H) .
  • Example 97 4-Hydroxy-3-[[ (2-methylphenyl)methyl]thio]-6-phenyl- 2H-pyran-2-one: The title compound was prepared by Method B using 4-hydroxy-6-phenyl-2H-pyran-2-one (1.00 g, 5.31 mmol), ethanol (15 mL) , IN sodium hydroxide (5.31 mL) , [ (2-methylphenyl)methyl] p- toluenethiosulfonate (1.55 g, 5.31 mmol). m.p. 176- 178 °C; ** H NMR (400 MHz, DMSO-d 6 ). ⁇ 2.42 (S, 3 H) , 3.99 (S, 2 H) , 6.74 (s, 1 H) , 709 (m, 4 H) , 7.53 (m, 3 H) , 7.79 (m, 2 H) .
  • Example 99 4-Hydroxy-3-[[ ( -methylphenyl)methyl]thio]-6-phenyl- 2H-pyran-2-one: The title compound was prepared by Method B using 4-hydroxy-6-phenyl-2H-pyran-2-one (1.00 g, 5.31 mmol), ethanol (15 mL) , IN sodium hydroxide. (5.31 mL) , [ (4-methylphenyl)methyl] p- toluenethiosulfonate (1.55 g, 5.31 mmol). m.p.
  • Example 100 6-[l,l -Biphenyl]-3-yl-4-hydroxy-3-[ (2- phenylethyl)thio]-2H-pyran-2-one :
  • the title compound was prepared by Method A using 3'-phenylacetophenone (2.00 q, 10.21 mmol), trimethylsilyltriflate (2.36 mL, 12.24 mmol), triethylamine (2.84 mL, 20.40 mmol), methylene chloride (26 mL) , and diethyl ester of [ (2- phenylethyl)thio]propanedioic acid (1.00 g, 3.37 mmol). m.p.
  • Example 101 4-Hydroxy-3-[[(4-methoxyphenyl)methyl]thio]-6-phenyl- 2H-pyran-2-one: The title compound was prepared by Method B using 4-hydroxy-6-phenyl-2H-pyran-2-one (1.00 g, 5.31 mmol), ethanol (15 mL) , IN sodium hydroxide (5.31 mL) , [ (4-methoxyphenyl)methyl] p- toluenethiosulfonate (2.21 g, 6.90 mmol). m.p.
  • Example 102 3-[2-Cyclohexyl-l-(cyclohexylthio)ethyl]-4-hydroxy-6- phenyl-2H-pyran-2-one, (+/-) :
  • the title compound was prepared by Method C using 4-hydroxy-6-phenyl-2H- pyran-2-one (1.00 g, 5.31 mmol), ethanol (10 mL) , cyclohexylmethyl carboxaIdehyde (0.735 g, 5.84 mmol), cyclohexylmercaptan (1.60 g, 13.8 mmol), piperdine (0.5 mL) , acetic acid (0.5mL) . m.p. dec.
  • Example 103 3-[l-[(2,6-Dimethylphenyl)thio]-3-methylbutyl]-4- hydroxy-6-phenyl-2H-pyran-2-one, (+/-) :
  • the title compound was prepared by Method C using 4-hydroxy-6- phenyl-2H-pyran-2-one (1.00 g, 5.31 mmol), ethanol (10 mL) , isovaleraldehyde (0.63 mL, 5.84 mmol), 2,6- dimethylthiophenol (1.90 q, 13.8 mmol), piperdine (0.5 mL) , acetic acid (0.5mL). m.p.
  • Example 104 3-[l-(Cyclohexylthio)-2-cycloprop lethyl]-4-hydroxy-6- phenyl-2H-pyran-2-one, (+/-) :
  • the title compound was prepared by Method C using 4-hydroxy-6-phenyl-2H- pyran-2-one (1.00 g, 5.31 mmol), ethanol (10 mL) , cyclopropylmethyl carboxaldehyde (0.67 g, 5.84 mmol), cyclohexylmercaptan (1.68 mL, 13.8 mmol), piperdine (0.5 mL) , acetic acid (0.5mL). m.p.
  • Example 105 3-[l-[ (2,6-Dichlorophenyl)thio]-3-methylbutyl]-4- hydroxy-6-phenyl-2H-pyran-2-one, (+/-) :
  • the title compound was prepared by Method C using 4-hydroxy-6- phenyl-2H-pyran-2-one (1.00 g, 5.31 mmol), ethanol (10 mL) , isovaleraldehyde (0.62 mL, 5.84 mmol), 2,6- dichlorothiophenol (2.74 g, 13.8 mmol), piperdine (.0.5 mL) , acetic acid (0.5mL). m.p.
  • Example 106 3-[l-(Cyclohexylthio)-3,3-dimethylbutyl]-4-hydroxy-6- phenyl-2H-pyran-2-one, (+/-) :
  • the title compound was prepared by Method C using 4-hydroxy-6-phenyl-2H- pyran-2-one (1.00 q, 5.31 mmol), ethanol (10 mL) , 3,3- dimethylbutanal (0.73 mL, 5.84 mmol), cyclohexylmercaptan (1.86 mL, 13.8 mmol) , piperdine (0.5 mL) , acetic acid (0.5mL). m.p.
  • Example 107 [ -[ -Hydroxy-2-oxo-3-[ (2-phenylethy1)thio]- 2H-pyran-6-yl]-2-methylphenoxy], acetic acid, ethyl ester:
  • the title compound was prepared by Method A using ethyl (4-acety1-2-methyIphenoxy)acetate (2.00 g, 8.47 mmol), trimethyl silyltriflate (3.92 mL, 20.33 mmol), triethylamine (4.72 mL, 33.88 mmol), methylene chloride (22 mL) , and diethyl ester of [ (2- phenylethyl)thio]propanedioic acid (1.00 g, 3.37 mmol).
  • Example 109 4-Hydroxy-3-[ (2-phenylethyl) hio]-6[4-(4- pyridinylmethoxy) henyl]-2H-pyran-2-one:
  • the title compound was prepared by Method A using 4'-(4- pyridinylmethoxy)acetophenone (2.00 g, 8.81 mmol), trimethylsilyltriflate (2.04 mL, 10.57 mmol), triethylamine (2.45 mL, 17.62 mmol), methylene chloride (22 mL) , and diethyl ester of [ (2- phenylethyl)thio]propanedioic acid (1.00 g, 3.37 mmol).
  • Example 110 3-[l-(Cyclopentylthio)-3-methylbutyl]-4-hydroxy-6- phenyl-2H-pyran-2-one (+/-) :
  • the title compound was prepared by Method C using 4-hydroxy-6-phenyl-2H- pyran-2-one (1.00 g, 5.31 mmol), ethanol (10 mL) , isovaleraldehyde (0.62 mL, 5.84 mmol), cyclopentylmercaptan (1.43 mL, 13.8 mmol), piperdine (0.5 mL) , acetic acid (0.5mL). m.p.
  • Example 112 3-[l-(Cyclohexylthio)-2-cyclopentylethyl]-4-hydroxy-6- phenyl-2H-pyran-2-one, (+/-) :
  • the title compound was prepared by Method C using 4-hydroxy-6-phenyl-2H- pyran-2-one (1.00 q, 5.31 mmol), ethanol (10 mL) , cyclopentylmethylcarboxaldehyde (0.65 g, 5.84 mmol), cyclohexylmercaptan (1.68 mL, 13.8 mmol), piperdine
  • Example 113 4-Hydroxy-6-(4-hydroxy-3,5-dimethylphenyl)-3- [ (phenylmethyl) hio]-2H-pyran-2-one: To a THF (10 mL) solution of 6-[3,5-dimethyl-4-[ [dimethyl(1,1- dimethylethyl)silyl]oxy]phenyl]-4-hydroxy-3-
  • Example 114 4-Hydroxy-6-phenyl-3-[[[3-(2- phenylethoxy)phenyl]methyl]thio]-2H-pyran-2-one :
  • the title compound was prepared by Method B using 4- hydroxy-6-phenyl-2H-pyran-2-one (1.00 g, 5.31 mmol), ethanol (15 mL) , IN sodium hydroxide (5.31 mL) , [3-(2- (phenylethoxy)phenyl]methyl p-toluenethiosulfonate (2.11 g, 5.31 mmol). m.p.
  • Example 115 4-Hydroxy-6-[4-(2-phenylethynyl)phenyl]-3-[(2- phenylethyl) hio]-2H-pyran-2-one:
  • the title compound was prepared by Method A using 4'-(2- phenethynyl)acetophenone (1.50 g, 6.81 mmol), trimethylsilyltriflate (1.57 mL, 8.17 mmol), triethylamine (1.89 mL, 13.62 mmol), methylene chloride (17 mL) , and diethyl ester of [ (2- phenylethyl)thio]propanedioic acid (1.00 g, 3.37 mmol). m.p.
  • Example 116 4-Hydroxy-6-[4-(2-phenylethyl)phenyl]-3-[(2- phenylethyl)thio]-2H-pyran-2-one:
  • the title compound was prepared by Method A using 4'-(2- phenethyl)acetophenone (1.50 g, 6.68 mmol), trimethylsilyltriflate (1.55 mL, 8.02 mmol), triethylamine (1.86 mL, 13.36 mmol), methylene chloride (17 mL) , and diethyl ester of [ (2- phenylethyl)thio]propanedioic acid (1.00 g, 3.37 mmol). m.p.
  • Example 117 3-[(Cyclohexylthio)phenylmethyl]-4-hydroxy-6-phenyl- 2H-pyran-2-one, (+/-) :
  • the title compound was prepared by Method C using 4-hydroxy-6-phenyl-2H- pyran-2-one (1.00 g, 5.31 mmol), ethanol (10 mL) , benzaldehyde (0.593 mL, 5.84 mmol), cyclohexylmercaptan (1.68 mL, 13.8 mmol), piperdine (0.5 mL) , acetic acid (0.5mL). m.p.
  • Example 119 3-[(Cyclohexylmethyl)thio]-4-hydroxy-6-phenyl-2H- pyran-2-one:
  • the title compound was prepared by Method B using 4-hydroxy-6-phenyl-2H-pyran-2-one (0.5 g, 2.66 mmol), ethanol (7 mL) , IN sodium hydroxide (2.66 mL) , cyclohexylmethyl-p-toluenethiosulfonate (0.756 g, 2.66 mmol). m.p.
  • Example 120 4-Hydroxy-3-[(2-phenylethyl)thio]-6-[3-methyl-4-(3- pyridinylmethoxy)phenyl]-2E-pyran-2-one:
  • the title compound was prepared by Method A using 3'-methy1-4'- (3-pyridinylmethoxy)acetophenone (2.0 g, 8.29 mmol), lithium bis(trimethylsilylamide (1.53 q, 9.13 mmol), chlorotrimethylsilane (1.54 g, 9.13 mmol) and diethyl ester of [2-(phenylethyl)thio]propanedioic acid (1.00 g, 3.37 mmol). m.p.
  • Example 121 6-(2,3-Dihydro-l,4-benzodioxin-6-yl)-4-hydroxy-3- [(phenylmethyl)thio]-2H-pyran-2-one:
  • the title compound was prepared by Method A using 1,4- benzodioxin-6-yl methyl etone (2.5 g, 14.25 mmol), lithium bis(trimethylsilylamide (2.35 g, 14.25 mmol), chlorotrimethylsilane (2.47 g, 14.25 mmol) and diethyl ester of [ (phenylmethyl)thio]propanedioic acid (1.00 g, 3.55 mmol). m.p.
  • Example 123 4-Hydroxy-3-[ (phenylmethyl)thio]-6-[3- (trifluoromethyl)phenyl]-2H-pyran-2-one: The title compound was prepared by Method A using the corresponding trimethylsilyl enol ether (9.8 mmol) and diethyl ester of [ (phenylmethyl)thio]propanedioic acid (2.76 g, 9.88 mmol). m.p.
  • Example 124 4-Hydroxy-3-[ (phenylmethyl)thio]-6-(2,3,4- trimethoxyphenyl)-2H-pyran-2-one: The title compound was prepared by Method A using 2',3',4'- trimethoxyacetophenone (1.5 q, 7.13 mmol), lithium bis(trimethylsilyl)amide (1.43 g, 8.56 mmol), chlorotrimethylsilane (1.8 mL, 10.67 mmol) and diethyl ester of [ (phenylmethyl)thio]propanedioic acid (1.00 g, 3.54 mmol) .
  • Example 125 N-[ -[ -Hydroxy-2-oxo-3-[(2-phenylethyl)thio]-2H- pyran-6-yl]phenyl]-benzenesulfonamide: The title compound was prepared by Method A using the corresponding benzenesulfonamide (3.0 g, 10.91 mmol), lithium bis(trimethylsilylamide (3.65 g, 21.82 mmol), chlorotrimethylsilane (3.68 mL, 21.82 mmol) and diethyl ester of [ (phenylethyl)thio]propanedioic acid (1.00 g, 3.37 mmol). m.p.
  • Example 126 6-[4-[ (3,5-Dimethyl-4-isoxazolyl)methoxy]phenyl]-4- hydroxy-3-[ (2-phenylethyl)thio]-2H-pyran-2-one:
  • the title compound was prepared by Method A using 4'-(3,5- dimethyl-4-isoxazolyl)acetophenone (1.65 g, 6.74 mmol), lithium bis(trimethylsilylamide (1.13 g, 6.74 mmol), chlorotrimethylsilane (l.l4mL, 6.74 mmol) and diethyl ester of [ (2-phenylethyl)thio]propanedioic acid (1.00 g, 3.37 mmol). m.p.
  • the title compound was prepared by Method C using 4- hydroxy-6-[3-methy1-4-(3-pyridinylmethoxy)phenyl]-2H- pyran-2-one (0.5 g, 1.62 mmol), benzaldehyde (0.189 q, 1.78 mmol), cyclohexylmercaptan (0.489 g, 4.212 mmol), piperidine, (0.5 mL) , acetic acid (0.5 mL) . m.p.
  • Example 128 2-[[(4-hydroxy-2-oxo-6-phenyl-2H-pyran-3- yl)thio]methyl]-benzoic acid methyl ester :
  • the title compound was prepared by Method B using 4-hydroxy-6- phenyl-2H-pyran-2-one (2.0 g, 10.63 mmol), [2- (carbomethoxy)phenyl]methyl p-toluenethiosulfonate (3.57 g, 10.63 mmol), IN NaOH (10.63mL), ethanol (20mL). m.p.
  • the title compound was prepared by Method C using 4- hydroxy-6-[1,4-benzodioxin-6-yl]-2H-pyran-2-one (l.0 q , 4.06 mmol), isovaleraldehyde (0.35 g, 4.06 mmol), cyclohexylmercaptan (0.944 g, 8.12 mmol), piperidine, (0.5 mL) , acetic acid (0.5 mL) . m.p. 161-162 °C; ** H
  • Example 131 4-Hydroxy-3-[(2-phenylethyl)thio]-6-[4-(lH-tetrazol-5- ylmethoxy)phenyl]-2H-pyran-2-one:
  • the title compound was prepared by using example 143 (0.5 g, 1.32 mmol) and trimethyltin azide (0.543 g, 2.64 mmol), toluene (lOmL) and ethanol (lOmL) at its reflux temperature for 24 ours. The solvents were evaporated. The residue was treated with IN HC1 and stirred at room temperature for 2 hours.
  • Example 132 4-Hydroxy-6-[3-aethyl-4-[ (2-pyridinyl)methoxy]phenyl]- 3-[ (2-phen leth l)thio]-2H-pyran-2-one:
  • the title compound was prepared by Method A using 4-(2- pyridinylmethoxy) -3-methylacetophenone (2.0 g, 8.29 mmol), trimethylsilyltrifluoromethylsulfonate (1.84 g, 8.29 mmol), triethylamine (1.68 g, 16.58mmol) and diethyl ester of [ (2-phenylethyl)thio]propanedioic acid (1.22 g, 4.15 mmol). m.p.
  • Example 134 4-Hydroxy-3-[l-[ (2-methoxyphenyl)thio]-3-methylbutyl]- 6-phenyl-2H-pyran-2-one (+/-) :
  • the title compound was prepared by Method C using 4-hydroxy-6-phenyl-2H- pyran-2-one (1.5 g, 7.98 mmol), isovaleraldehyde (0.69 g, 7.98 mmol), 2-methoxythiophenol (2.24 g, 15.96 mmol), piperidine, (1.0 mL) , acetic acid (1.0 mL) and ethanol (15mL) . m.p.
  • Example 135 4-Hydroxy-3-[l-[ (phenylmethyl)thio]-3-methylbutyl]-6- phenyl-2H-pyran-2-one (+/-): The title compound was prepared by Method C using 4-hydroxy-6-phenyl-2H- pyran-2-one (1.5 g, 7.98 mmol), isovaleraldehyde (0.69 g, 7.98 mmol), benzylmercaptan (1.98 g, 15.96 mmol), piperidine, (1.0 mL) , acetic acid (1.0 mL) . m.p.
  • Methyl ester of 3-[[4-[4-hydroxy-2-oxo-3-[(2- phenylethyl)thio]-2H-pyran-6-yl]phenoxy]methyl]- benzoic acid The title compound was prepared by Method A using 3-[[ (4-acetyl)phenoxy]methyl]benzoic acid methyl ester (2.0 g, 7.04 mmol), lithiumhexamethyldisilazane (2.36 g, 14.08 mmol), chlorotrimethylsilane (2.38 g, 14.08 mmol) and diethyl ester of [ (2-phenylethyl)thio]propanedioic acid (1.0 g, 3.05 mmol). m.p.
  • Example 138 6[4-[3,4-Dichlorophenylmethoxy]phenyl]-4-hydroxy-3- [(2-phenylethyl)thio]-2H-pyran-2-one:
  • the title compound was prepared by Method A using 4-[(3,4- dichloropheny1)methoxy]acetophenone (2.0 g, 6.80 mmol), lithium hexamethyldisilazide (2.28 g, 13.61 mmol), chlorotrimethylsilane (2.3 g, 13.61 mmol) and diethyl ester of [ (2-phenylethyl)thio]propanedioic acid (1.0 g, 3.40 mmol). m.p.
  • Example 139 3-[[ (4-hydroxy-2-oxo-6-phenyl-2H-pyran-3- yl)thio]methyl]-benzoic acid methylester:
  • the title compound was prepared by Method B using 4-hydroxy-6- phenyl-2H-pyran-2-one (2.0 g, 10.63 mmol), [3-
  • Methylester of 4-[[(4-hydroxy-2-oxo-6-phenyl-2H-pyran- 3-yl) hio] ethyl] enzoic acid The title compound was prepared by Method B using 4-hydroxy-6-phenyl- 2H-pyran-2-one (2.0 g, 10.63 mmol), [4- (carbornethoxy)phenyl]methyl p -toluenethiosulfonate (3.57 g, 10.63 mmol), IN NaOH (10.63mL), ethanol (20mL) . m.p.
  • the title compound was prepared by Method C using 4- hydroxy-6-phenyl-2H-pyran-2-one (1.5 g, 7.98 mmol), isovaleraldehyde (076 g, 8.78 mmol), cyclohexylmercaptan (2.04 g, 17.56 mmol), piperidine, (1.0 mL) , acetic acid (1.0 mL) and ethanol (20mL) .m.p.
  • Example 143 [4-[4-Hydroxy-2-oxo-3-[(2-phenylethyl) hio]-2H-pyran- 6-yl]phenoxy]acetonitrile: The title compound was prepared by Method A using the appropriate acetophenone (3.0 g, 17.12 mmol), trimethylsilyltrifluoromethylsulfonate (3.8 g, 17.12 mmol), triethylamine (3.46 q, 34.24mmol) and diethyl ester of [2-(phenylethyl)thio]propanedioic acid (2.53 g, 8.56 mmol). m.p.
  • the title compound was prepared by Method A using 1- phenyl-1-(trimethylsilyloxy)ethylene (1.24 g, 6.45 mmol),and diethyl ester of (2-isopropylphenyl)thio propanedioic acid (1.0 g, 3.23 mmol).
  • the title compound (0.053 q, m.p. 136-137 °C) was prepared by method B using 4-hydroxy-6-phenyl-2H- pyran-2-one (0.250 g, 1.33 mmol), eyelopropylmethyl-p- toluenethiosulfonate (0.585 g, 2.261 mmol), triethylamine (0.158 g, 1.46 mmol), sodium bicarbonate (0.110 g, 1.33 mmol), ethanol (10.0 mL) .
  • the title compound (0.024 g, m.p. 123-124 °C) was prepared by method B using 6-(3-chlorophenyl)-4- hydroxy-2H-pyran-2-one (0.250 q, 1.13 mmol), 4-phenyl- butyl-p-toluenethiosulfonate (0.45 g, 1.93 mmol), triethylamine (0.115 g, 1.13 mmol), sodium bicarbonate (0.094 g, 1.13 mmol), ethanol (5.0 mL) . ** H NMR (400 MHz , CDC1 3 ) ⁇ 7.848 - 7. 839 (m, 1 H) , 7 .729 (m, 1 H) ,
  • Example 147 4-Hydroxy-3-[(2-oxo-2-phenylethyl)thio]-6-phenyl-2H- pyran-2-one.
  • a solution of 4-hydroxy-3-mercapto-6- pheny1-2-pyrone (0.175, 0.840 mmol, prepared as in R.F. Harris, J.E. Dunbar, U.S. 3,818,046) in CH 2 C1 2 . (3.0 mL) under an N 2 atmosphere was treated with triethylamine (0.12 mL, 0.84 mmol) followed by bromoacetophenone (0.167 g, 0.840 mmol). The mixture was allowed to stir for 30 min. at ambient temperature then the solvent removed in vacuo.
  • Example 148 4-Hydroxy-3-[(2-phenylethan-2-ol)thio]-6-phenyl-2H- pyran-2-one.
  • Example 150 [4-[4-Hydroxy-2-oxo-3-(phenylthio)-2H-pyran-6- yl] henoxy]-acetic acid.
  • Example 151 [4-[4-Hydroxy-5-methyl-2-oxo-3-(phenylthio)-2H-pyran- 6-yl]phenoxy]-acetic acid.
  • the title compound (0.691 g, m.p. 194 - 197 °C) was prepared in a similar manner to that demonstrated in the preparation of [4- [4-hydroxy-2-oxo-3-(phenylthio)-2H-pyran-6- yl]phenoxy]-acetic acid using the following: Methyl- [4-(1-oxoethyl)phenoxy]-acetate (2.00 g, 8.81 mmol), triethylamine (3.68 mL, 26.4 mmol), trimethylsilyltriflate (2.38 mL, 12.3 mmol), dichloromethane (20.0 mL) , diethyl 2- (thiophenyl)propane-l,3-dioate (1.34 g, 5.00
  • Example 153 4-Hydroxy-3-[(phenylmethyl)thio]-6-(3-pyridinyl)-2H- pyran-2-one.
  • the title compound was prepared from the condensation of the trimethylsilyl enol ether of 3- acetyl pyridine and diethyl ester of [ (phenylmethyl)thio]propanedioic acid following the same procedure outlined in Method A; m.p. 183-184 °C.
  • Example 154 6-(2,6-Dimethyl-4-pyridinyl)-4-hydroxy-3- [(phenylmethyl)thio]-2H-pyran-2-one.
  • the title compound was prepared from the condensation of the trimethylsilyl enol ether of 4-acetyl-2,6- dimethylpyridine and the diethyl ester of [ (phenylmethyl)thio]propanedioic acid following the same procedure outlined in Method A; m.p. 88-90 °C.
  • Example 155 4-Hydroxy-3-[(phenylmethyl)thio]-6-(3-thienyl)-2H- pyran-2-one.
  • the title compound was prepared from the condensation of the trimethylsilyl enol ether of 3- acetylthiophene and the diethyl ester of [ (phenylmethyl)thio]propanedioic acid following the same procedure outlined in Method A; m.p. 150-151 °C.
  • Example 156 3-[ (2,6-Dimethylphenyl)methyl]thio]-4-hydroxy-6- phenyl-2H-pyran-2-one:
  • the title compound was prepared by Method B using 4-hydroxy-6-phenyl-2H- pyran-2-one (1.00 g, 5.31 mmol), ethanol (15 mL) , IN sodium hydroxide (5.31 mL) , (2,6-dimethylphenyl)methyl p-toluenethiosulfonate (1.62 g, 5.31 mmol). m.p.
  • Example 158 3-[l-[ (Cyclohexylmethyl)thio]-3-methylbutyl]-4- hydroxy-6-phenyl-2H-pyran-2-one, (+/-) :
  • the title compound was prepared by Method C using 4-hydroxy-6- phenyl-2H-pyran-2-one (1.00 q, 5.31 mmol), ethanol (10 mL) , isovaleraldehyde (0.462 mL, 5.84 mmol), cyclohexylmethylthiol (1.79 g, 13.8 mmol), piperidine (0.5 mL) , acetic acid (0.5 mL) . m.p.
  • Example 159 3 ⁇ [1 ⁇ [ (Cyclohexylmethyl)thio]phenylmethyl]-4-hydroxy- 6-phenyl-2H-pyran-2-one, (+/-) :
  • the title compound was prepared by Method c using 4-hydroxy-6-phenyl-2H- pyran-2-one (1.00 g, 5.31 mmol), ethanol (10 mL) , benzaldehyde (0.593 mL, 5.84 mmol), cyclohexylmethylthio1 (1.79 g, 13.8 mmol), piperidine (0.5 mL) , acetic acid (0.5mL). m.p.
  • Example 160 4-Hydroxy-6-[4-(2-hydrox ethoxy) henyl]-3-[(2- phenylethyl)thio]-2H-pyran-2-one: To a tetrahydrofuran (7 mL) solution of [4-[4-hydroxy-2- oxo-3[ (2-phenylethyl)thio]-2H-pyran-6-yl]- phenoxy]acetic acid, ethyl ester (0.30 g, 0.70 mmol) was added 2.0 M lithium borohydride (0.5 mL, 1.00. mmol) . The reaction was stirred overnight.
  • Example 161 [3-[4-Hydroxy-2-oxo-3-[(2-phenylethyl)thio]-2H-pyran -6-yl]phenoxy] acetic acid, ethyl ester:
  • the title compound was prepared by Method A using ethyl (3- acetyIphenoxy)acetate (2.00 g, 9.00 mmol), trimethyl silyltriflate (4.18 mL, 21.62 mmol), triethylamine (5.01 mL, 36.00 mmol), methylene chloride (23 mL) , and diethyl ester of [ (2-phenylethyl)thio]propanedioic acid (1.00 g, 3.37 mmol).
  • Example 162 4-Hydroxy-6-[4-[(5-methyl-3-phenyl-4- isoxazolyl)methoxy]phenyl]-3-[(2-phenylethyl)thio]-2H- pyran-2-one:
  • the title compound was prepared by Method A using 4'-[ (5-methyl-3-phenyl-4- isoxaoly)methoxy]acetophenone (2.00 g, 6.51 mmol), trimethylsilyl triflate (1.51 mL, 7.81 mmol), triethylamine (1.81 mL, 13.02 mmol), methylene chloride (16 mL) , and diethyl ester of [ (2- phenylethyl)thio]propanedioic acid (l.OOg, 3.37 mmol).
  • Example 163 6-(3,5-Dimethylphen l)-4-hydroxy-3-(phenylthio)-2H- pyran-2-one: The title compound was prepared by Method A using 3',5'-dimethylacetophenone (1.43 g, 9.70 mmol), trimethylsilyl triflate (2.24 mL, 11.64 mmol), triethylamine (2.70 mL, 19.40 mmol), methylene chloride (24 mL) , and diethyl ester of (phenylthio)- propanedioic acid (1.00 q, 7.46 mmol). m.p.
  • Example 164 3-[1-[Cyclopentylthio]-2-cyclopropylethyl]- -hydroxy- 6-phenyl-2H-pyran-2-one, (+/-) :
  • the title compound was prepared by Method C using 4-hydroxy-6-phenyl-2H- pyran-2-one (1.00 g, 5.31 mmol), ethanol (10 mL) , cyclopropylmethylcarboxaldehyde (0.892 g, 10.62 mmol), cyclopentyIthiol (1.43 mL, 13.8 mmol) , piperidine (0.5 mL) , acetic acid (0.5 mL) .
  • Example 165 N-[3-[4-Hydroxy-2-oxo-3-[(2-phenylethyl)thio]-2H- pyran-6-yl]phenyl]-4-methyl-benzenesulfonamide: The title compound was prepared by Method A using 3'-(p- toluenesulfonamide)acetophenone (1.38 g, 5.06 mmol), trimethylsilyl triflate (2.34 mL, 12.41 mmol), triethylamine (2.82 mL, 20.24 mmol) , methylene chloride (18 mL) , and diethyl ester of [ (2- phenylethyl)thio]propanedioic acid (1.00 g, 3.37 mmol).
  • Example 166 3-[Cyclopentyl(cyclopentylthio)methyl]-4-hydroxy-6- phenyl-2H-pyran-2-one, (+/-):
  • the title compound was prepared by Method C using 4-hydroxy-6-phenyl-2H- pyran-2-one (1.00 g, 5.31 mmol), ethanol (10 mL) , eye1opentanecarboxaIdehyde (0.780 g, 7.96 mmo1) , cyclopentylthiol(1.43 mL, 13.8 mmol) , piperidine (0.5 mL) , acetic acid (0.5 mL) .
  • Example 167 6-(l,l'-Biphen-3-yl)-4-hydroxy-3-[ (2-isopropylphenyl) thio]-2H-pyran-2-one:
  • the title compound was prepared by Method A using 3'-phenylacetophenone (0.946 g, 4.83 mmol), trimethylsilyl triflate (1.12 mL, 5.79 mmol), triethylamine (1.34 mL, 9.66 mmol), methylene chloride (17 mL) , and diethyl ester of [ (2- isopropylphenyl)thio]-propanedioic acid (1.00 g, 3.22 mmol). m.p.
  • Example 169 6-(3,5-Dimethylphenyl)-4-hydroxy-3-[ (2-isopropylphenyl) thio]-2H-pyran-2-one;
  • the title compound was prepared by Method A using 3',5'-dimethylacetophenone (0.714 g, 4.83 mmol) , trimethylsilyl triflate (1.12 mL, 5.79 mmol), triethylamine (1.34 mL, 9.66 mmol), methylene chloride (17 mL) , and diethyl ester of [ (2- isopropylphenyl)thio]propanedioic acid (l.OOg, 3.22 mmol) m.p.
  • Example 170 4-Hydroxy-6-(4-hydroxyphenyl)-3-[(2-isopropylphenyl) thio]-2H-pyran-2-one: The title compound was prepared by Method A using 4'-hydroxyacetophenone (0.657 q, A .83 mmol), trimethylsilyl triflate (2.05 mL, 10.62 mmol), triethylamine (2.69 mL, 19.32 mmol), methylene chloride (20 mL) , and diethyl ester of [ (2- isopropylpheny1)thio] ropanedioic acid (l.OOg, 3.22 mmol) m.p.
  • Example 171 3-[[2-(Cyclopropylmethyl)phenyl]thio]-4-hydroxy-6- phenyl-2H-pyran-2-one: The title compound was prepared by Method A using l-phenyl-1- (trimethylsilyloxy)ethylene (0.990 mL, 4.83 mmol), and diethyl ester of [[2-(cyclopropylmethyl)phenyl]thio] propanedioic acid (l.OOg, 3.10 mmol) m.p.
  • Example 172 4-Hydrojy-3-[(2-isopropylphenyl)thio]-6-[4-(pyridin- 3-ylmethoxy)phenyl]-2H-pyran-2-one: The title compound was prepared by Method A using 4'-(pyridin-3- ylmethoxy)acetophenone (1.09 g, 4.83 mmol), trimethylsilyl triflate (1.12 mL, 5.79 mmol), triethylamine (1.34 L, 9.66 mmol), methylene chloride (17 mL) , and diethyl ester of [ (2- isopropylphenyl)thio]-propanedioic acid (1.00 g, 3.22 mmol) m.p.
  • Example 174 4-[4-Hydroxy-5-[(2-isopropylphenyl)thio]-6-oxo-6H- pyran-2-yl]-phenoxy acetic acid: To a tetrahydrofuran (10 ml) solution of 4-[4-Hydroxy-5-[(2- isopropylphenyl)thio]-6-oxo-6H-pyran-2-yl]phenoxy acetic acid ethyl ester (0.319 g. 0.75 mmol) was added IN sodium hydroxide (1.80 mL, 1.81 mmol). The reaction was stirred for 1.5 h, and then water (10 ml) was added followed by acidification with cone. hydrochloric acid to pH 2.
  • the title compound was prepared by Method A using 4'- methoxyacetophenone (2.26 q, 15.1 mmol). trimethylsilyl triflate (3.5 mL, 18.1 mmol), triethylamine (4.26 mL, 30.6 mmol), methylene chloride (30 mL) , and diethyl ester of [ (2- isopropylphenyl)thio]propanedioic acid (3.11 g, 10.0 mmol) m.p.
  • the title compound was prepared by Method A using 3' ,4'-dichloroacetophenone ( 2.46 g, 12.8 mmol) , trimethylsilyl triflate (3.0 mL, 15.4 mmol), triethylamine (3.6 mL, 26.0 mmol), methylene chloride (30 mL) , and diethyl ester of [(2- isopropylphenyl)thio] propanedioic acid (4.0 g, 12.8 mmol) m.p.
  • the title compound was prepared by Method A using A ' - chloroacetophenone ( 2.33 g, 15.1 mmol), trimethylsilyl triflate (3.5 mL, 18.1 mmol), triethylamine (4.26 mL, 30.6 mmol), methylene chloride (30 mL) , and diethyl ester of [ (2- isopropylphenyl)thio] propanedioic acid (3.11 g, 10.0 mmol) m.p.
  • Example 179 4-[4-Hydroxy-5-[(2-isopropylphenyl)thio]-6-oxo-6H- pyran-2-yl]benzoic acid ethyl ester:
  • the title compound was prepared by Method A using ethyl 4- acetylbenzoate (2.93 g, 15.1 mmol), trimethylsilyl triflate (3.5 mL, 18.1 mmol), triethylamine (4.26 mL, 30.6 mmol), methylene chloride (30 mL) , and diethyl ester of [ (2-isopropylphenyl)thio]propanedioic acid (3.11 g, 10.0 mmol) m.p.
  • Example 180 4-Hydroxy-6-(3-hydroxyphenyl)-3-[(2- isopropylphenyl) hio]-2H-pyran-2-one:
  • the title compound was prepared by Method A using 3'- hydroxyacetophenone ( 2.06 g, 15.1 mmol), trimethylsilyl triflate (7.0 mL, 36.2 mmol), triethylamine (8.52 mL, 61.1 mmol), methylene chloride (30 mL) , and diethyl ester of [ (2- isopropylphenyl)thio] propanedioic acid (3.11 g, 10.0 mmol) m.p.
  • the title compound was prepared by Method A using trans-4-phenyl-3-buten-2-one ( 2.23 g, 15.1 mmol), trimethylsilyl triflate (3.5 mL, 18.1 mmol), triethylamine (4.26 mL, 30.6 mmol), methylene chloride (30 mL) , and diethyl ester of [ (2- isopropylphenyl)thio] propanedioic acid (3.11 q, 10.0 mmol) m.p.
  • the title compound was prepared by Method A using 4- acetylbiphenyl ( 3.06 g, 15.1 mmol), trimethylsilyl triflate (3.5 mL, 18.1 mmol), triethylamine (4.26 mL, 30.6 mmol), methylene chloride (30 mL) , and diethyl ester of [ (2-isopropylphenyl)thio]propanedioic acid (3.11 g, 10.0 mmol) m.p.
  • Example 183 6-(i,l'-Biphenyl-3-yl)-4-hydroxy-3-[(naphthalen-2- yl)thio]-2H-pyran-2-one The title compound was prepared by Method A using 3'-phenylacetophenone (2 q , 10.20 mmol), trimethylsilyl triflate (2.27 g, 10.20 mmol), triethylamine (2.06 g, 20.40 mmol), methylene chloride (20 mL) , and diethyl ester of [2-(naphthalen- 2-yl)thio]-propanedioic acid (1.62 g, 5.1 mmol). m.p.
  • Example 184 4-Hydroxy-3-[(naphthalen-l-yl)thio]-6-phenyl-2H-pyran- 2-one: The title compound was prepared by Method A using 1-phenyl-l-(trimethylsilyloxy)ethylene (1.95 g, 10.14 mmol) and diethyl ester of [ (1- naphthyl)thio]propanedioic acid (1.61g, 5.07 mmol). m.p.
  • Example 187 6-(l,l'-Biphenyl-3-yl)-4-hydroxy-3-[(2-isobutylphenyl) thio]-2H-pyran-2-one:
  • the title compound was prepared by Method A using 3'-phenylacetophenone (2 g, 10.20 mmol), trimethylsilyl triflate (2.27 q, 10.20 mmol), triethylamine (2.06 g, 20.40 mmol), methylene chloride (20 mL) , and diethyl ester of [ (2- isobutylphenyl)thio]propanedioic acid (1.14 g, 5.1 mmol). m.p.
  • Example 190 4-Hydroxy-3-[ (2-isopropylphenyl)thio]-6-(3- methylphenyl)-2H-pyran-2-one: The title compound was prepared by Method A using 3'-methylacetophenone (0.87 g, 6.46 mmol), trimethylsilyl triflate (1.44g, 6.46 mmol), triethylamine (0.653 q, 6.46 mmol), methylene chloride (20 mL) , and diethyl ester of [ (2- isopropylphenyl)thio]propanedioic acid (1.0 g, 3.23 mmol). m.p.
  • Example 193 6-(3,5-Dichlorophenyl)-4-hydroxy-3-[ (2- isopropylphenyl)thio]-2H-pyran-2-one:
  • the title compound was prepared by Method A using 3,5- dichloroacetophenone (2 g, 10.58 mmol), trimethylsilyl triflate (2.35 g, 10.58 mmol), triethylamine (2.14 g, 21.16 mmol), methylene chloride (20 mL) , and diethyl ester of [ (2-isopropylphenyl)thio]propanedioic acid (1.64 g, 5.29 mmol).
  • Example 194 3-[(2,6-Dimethylphenyl)thio]-4-hydroxy-6-phenyl-2H-. pyran-2-one: The title compound was prepared by Method A using l-phenyl-1-(trimethylsilyloxy)ethylene (1.95 g, 10.14 mmol) and diethyl ester of [(2,6- dimethylphenyl)thio]propanedioic acid (2.0 g, 6.8 mmol). m.p.
  • Example 195 4-Hydroxy-3-[(2-methylphenyl)thio]-6-phenyl-2H-pyran- 2-one: The title compound was prepared by Method A using l-phenyl-1-(trimethylsilyloxy)ethylene (1.95 g, 10.14 mmol) and diethyl ester of [ (2- methylphenyl)thio]propanedioic acid (1.43 g, 5.07 mmol). m.p.
  • Example 196 3-(2,6-Dichlorophenyl)thio]-4-hydroxy-6-phenyl-2H- pyran-2-one:
  • the title compound was prepared by Method A using l-phenyl-1-(trimethylsilyloxy)ethylene (1.72 q, 8.93 mmol) and diethyl ester of [(2,6- dichloropheny1)thio]propanedioic acid (1.5 g, 4.46 mmol). m.p.
  • Example 197 4-[5-(l-Cyclopentylthio-3-methylbutyl)-4-hydroxy-6- oxo-6H-pyran-2-yl] enzoic acid ethyl ester (+/-) :
  • the title compound was prepared by Method C using 4- hydroxy-6-(4'-carbethoxyphenyl)-2H-pyran-2-one (1.50 g, 5.77 mmol), ethanol (15 mL) , isovalaraldehyde (0.497 g, 5.77 mmol), cyclopentyIthiol (1.18 g, 11.54 mmol), piperidine (l.O mL) , acetic acid (l.O mL) . m.p.
  • Example 198 3-[[(Benzylthio)pyridin-3-yl]methyl]-4-hydroxy-6- phenyl-2H-pyran-2-one (+/-):
  • the title compound was prepared by Method C using 4-hydroxy-6-phenyl-2H- pyran-2-one (1.50 g, 7.98 mmol), ethanol (10 mL) , pyridine-3-carboxaldehyde (0.86 g, 7.98 mmol), benzylmercaptan (1.98g, 15.96 mmol), piperidine (0.5 mL) , acetic acid (0.5 mL) . m.p.
  • Example 199 3-(l-Cyclopentylthio-2-cyclopropylethyl)-6-(2,3- dihydrobenzo[l,4]dioxin-6-yl)-4-hydroxy-2H-pyran-2-one (+/-) :
  • the title compound was prepared by Method C using 4-hydroxy-6-(2,3-dihydrobenzo[l,4]dioxin-6-yl)- 2H-pyran-2-one (1.00 g, 4.06 mmol), ethanol (15 mL) , cyclopropylmethylcarboxaldehyde (0.34 g, 4.06 mmol), cyclopentylthiol (0.83 g, 8.12 mmol), piperidine (1.0 mL) , acetic acid (1.0 mL) .
  • Example 200 4-[[(4-Hydroxy-6-oxo-5-[(phenylethyl)thio]-6H-pyran-2- yl)-phenoxy]methyl] enzoic acid: To a dioxane (20 mL) solution of 4-[[4-hydroxy-2-oxo-3-[ (2- phenylethyl)thio]-2H-pyran-6-yl]phenoxy]methyl]benzoic acid methyl ester (0.25 g) was added 2N sodium hydroxide, followed by methanol to keep the reaction homogeneous. Reaction was stirred at room temperature for 24h. Solvents were evaporated. The residue was acidified with 3N hydrochloric acid.
  • Example 201 4-(4-Hydroxy-6-oxo-5-[(2-phenylethyl)thio]-6H-pyran-2- yl)benzoic acid ethyl ester: The title compound was prepared by Method A using 4-carboethoxy acetophenone (3 q, 15.61 mmol), trimethylsilyl triflate (3.47 g, 15.61 mmol), triethylamine (3.16 g, 31.22 mmol), methylene chloride (20 mL) , and diethyl ester of [2- (phenylethyl)thio]-propanedioic acid (2.31 g, 7.81 mmol). m.p.
  • Example 202 4-(4-Hydroxy-6-oxo-5-[(2-phenylethyl)thio]-6H-pyran-2- yl)benzoic acid: The compound 4-(4-hydroxy-6-oxo-5- (2-phenylethyl)thio-6H-pyran-2-yl)benzoic acid ethyl ester (0.2 g) was saponified as described in example 200. m.p.
  • Example 203 6-(2,3-Dihydrobenzo[1,4] ioxin-6-yl)-4-hydroxy-3-[(2- isopropylphenyl)thio]-2H-pyran-2-one:
  • the title compound was prepared by Method A using 1,4- benzodioxin-6-yl methyl ketone (2 g, 11.22 mmol), trimethylsilyl triflate (2.5 g, 11.22 mmol), triethylamine (2.27 q, 22. AA mmol), methylene chloride (20 mL) , and diethyl ester of [ (2- isopropylphenyl)thio]propanedioic acid (1.73 g, 5.61 mmol). m.p.
  • Example 204 3-( ⁇ -Benzylthio-3-methylbuty1)-6-(2,3- dihydrobenzo[l,4]dioxin-6-yl)-4-hydroxy-2H-pyran-2-one (+/-):
  • the title compound was prepared by Method C using 4-hydroxy-6-(2,3-dihydrobenzo[l,4]dioxin-6-yl)- 2H-pyran-2-one (1.00 g, 4.06 mmol), ethanol (15 mL) , isovaleraldehyde (0.35 g, 4.06 mmol), benzylmercaptan (1.0 g, 8.12 mmol), piperidine (0.5 mL) , acetic acid (0.5 mL) .
  • - ⁇ NMR 400 MHz, DMSO-d 6 ) ⁇ 0.78 (t, 6H) ,
  • Example 205 3-[[(Cyclohexylthio)pyridin-4-yl]methyl]-4-hydroxy-6- phenyl-2H-pyran-2-one(+/-) :
  • the title compound was prepared by Method C using 4-hydroxy-6-phenyl-2H- pyran-2-one (1.5 g, 7.98 mmol), ethanol (10 mL) , pyridine-4-carboxaldehyde (0.86 g, 7.98 mmol), cyclohexylthiol (1.86 g, 7.98 mmol), piperidine (0.5 mL) , acetic acid (0.5 mL) .
  • Example 206 3-[[ (Cyclohex lthio)pyridin-3-yl]methyl]-4-hydroxy-6- phenyl-2H-pyran-2-one (+/-) :
  • the title compound was prepared by Method C using 4-hydroxy-6-phenyl-2H- pyran-2-one (1.5 g, 7.98 mmol), ethanol (10 mL) , pyridine-3-carboxaIdehyde (0.86g, 7.98 mmol), cyclohexylthiol (1.86g, 7.98 mmol), piperidine (0.5 mL) , acetic acid ( 0. 5 mL) .
  • X H NMR 400 MHz , DMSO-d 6 ) ⁇ 5 1.
  • Example 207 4-[[(4-Hydroxy-2-oxo-6-phenyl-2H-pyran-3- yl) hio]methyl]benzoic acid: The title compound was prepared by the saponification of methyl ester of 4- [[ (4-hydroxy-2-oxo-6-phenyl-2H-pyran-3- yl)thio]methyl]benzoic acid (0.1 g) as described in Example 200. ** H NMR (400 MHz, DMSO-d 6 ) ⁇ * 4.06 (s, 2H) , 6.72 (S, IH) , 7.36 (d, 2H) , 7.58 (m, 3H) , 7.86 (m, 4H) .
  • Example 208 3-[[(4-Hydroxy-2-oxo-6-phenyl-2H-pyran-3- yl)thio]m ⁇ thyl]benzoic acid: The title compound was prepared by the saponification of methyl ester of 3- [[ (4-hydroxy-2-oxo-6-phenyl-2H-pyran-3- yl)thio]methyl]benzoic acid (0.1 g) as described in Example 200.
  • Example 209 2-[[(4-Hydroxy-2-oxo-6-phenyl-2H-pyran-3- yl)thio]methyl]benzoic acid: The title compound was prepared by the saponification of methyl ester of 2- [[ (4-hydroxy-2-oxo-6-phenyl-2H-pyran-3- yl)thio]methyl]benzoic acid (0.2 g) as described in Example 200.
  • Example 210 3-[(2-Chlorophenyl)thio]-4-hydroxy-6-phenyl-2H-pyran- 2-one: The title compound was prepared by Method A using l-phenyl-l-(trimethylsilylojcy)ethylene (1.95 g, 10.14 mmol) and diethyl ester of [ (2- chlorophenyl)thio]propanedioic acid (1.53 g, 5.07 mmol). m.p.
  • Example 212 6-(4-Benzyloxyphenyl)-4-hydroxy-3-[ (2-isopropyl ⁇ phenyl)thio]-2H-pyran-2-one:
  • the title compound was prepared by Method A using 4-benzyloxyacetophenone (0.3 g, 0.675 mmol), trimethylsilyl triflate (0.15 g, 0.675 mmol), triethylamine (0.14 g, 1.35 mmol), methylene chloride (20 mL) , and diethyl ester of [ (2- isopropylphenyl)thio]propanedioic acid (0.210 g, 0.675 mmol). m.p.
  • Example 216 3-[(2-Ethylphenyl)thio]-4-hydroxy-6-phenyl-2H-pyran-2- one:
  • the title compound was prepared by Method A using l-phenyl-l-(trimethylsilyloxy)ethylene (4.17 g, 21.72 mmol) and diethyl ester of [ (2- ethylphenyl)thio]propanedioic acid (1.5 g, 10.86 mmol). m.p. 190-192 °C; ** H NMR (400 MHz, DMSO-d 6 ) ⁇
  • Example 217 Acetic acid 3-[ (2-isopropylphenyl)thio]-2-oxo-6- phenyl-2H-pyran-4-yl ester: This compound was prepared by the treatment of sodium salt of 4-hydroxy-3-[2- isopropylphenyl)thio]-6-phenyl-2H-pyran-2-one (0.2 g, 0.59 mmol) with acety1 chloride (0.09 g, 1.18 mmol) as described in general procedure G. m.p.
  • Example 219 3-[3,5-Dimethylphenyl)thio]-4-hydroxy-6-phenyl-2H- pyran-2-one:
  • the title compound was prepared by Method A using l-phenyl-l-(trimethylsilyloxy)ethylene (1.3 g, 6.76 mmol) and diethyl ester of [(3,5- dimethylphenyl)thio]propanedioic acid (1.0 q, 3.38 mmol). m.p.
  • Example 220 6-[4-(Cyclohexylmethoxy)phenyl]-4-hydroxy-3-[(2- isopropylphen 1)thio]-2H-pyran-2-one:
  • the title compound was prepared by Method A using 4- cyclohexylmethoxy acetophenone (2.0 g, 8.61 mmol), trimethylsilyl triflate (1.91 g, 8.61 mmol), triethylamine (1.74 q , 17.22 mmol), methylene chloride (20 mL) , and diethyl ester of [ (2- isopropylphenyl)thio]propanedioic acid (4.0 g, 12.92 mmol). m.p. 187-188 °C; ** H NMR (400 MHZ, DMS0-d 6 ) -5.
  • Example 222 4-Hydroxy-3-[(2-isopropylphenyl)thio]-6-[4-(3- phenylpropoxy)phenyl]-2H-pyran-2-one: The title compound was prepared by Method A using 4- phenylpropyloxy acetophenone (2.0 g, 7.86 mmol), trimethylsilyl triflate (1.75 g, 7.86 mmol), triethylamine (1.59 g, 15.72 mmol) and diethyl ester of [ (2-isopropylphenyl)thio]-propanedioic acid (3.66 g, 11.79 mmol). m.p.
  • Example 223 3-[ (2-sec-But lphen l)thio]-4-hydroxy-6-phenyl-2H- pyran-2-one (+/-):
  • the title compound was prepared by Method A using l-phenyl-l-(trimethylsilyloxy)ethylene (1.0 g, 6.17 mmol) and diethyl ester of [ (2-sec- butylphenyl)thio]propanedioic acid (1.0 q, 3.09 mmol). m.p.
  • DTT Buffer 1.0 mM dithiothreitol (DTT) was prepared fresh daily in 0.1% polyethylene glycol (mw 8000) 80 mM NaOAc, 160 mM NaCl, 1.0 mM EDTA, and brought to pH 4.7 with HC1.
  • HIV-I Protease The enzyme is obtained from Bachem Bioscience Inc. The undiluted enzyme is thawed from -80 °C and diluted 50-fold with DTT buffer. The solution is always kept at O "C on ice water and used in the experiment within 20 minutes after thawing.
  • Enzyme substrate Substrate III from Bachem Bioscience Inc. is the undecapeptide H-His-Lys-Ala-Arg-Val-Leu-p- Nitrophenylalanine-Glu-Ala-Norleucine-Ser-NH2 (> 97 % purity) .
  • a 200 ⁇ ftf stock solution in DTT buffer is prepared and stored on ice. Substrate solution is prepared fresh daily.
  • DMSO dimethyl sulfoxide
  • reaction plate To each reaction well is added 20 ⁇ l of substrate (final concentration of 40 ⁇ M) , 50 ⁇ l of inhibitor .(at a concentration such that final dilution will produce the test concentration) and 20 ⁇ l of DTT buffer.
  • substrate final concentration of 40 ⁇ M
  • inhibitor at a concentration such that final dilution will produce the test concentration
  • DTT buffer 20 ⁇ l
  • the reaction is incubated for 5 minutes at 37 °C.
  • the reaction is stopped by placing the reaction plate on the shaker and adding 20 ⁇ l of 10% trifluoroacetic acid (TFA) and shaking for 10 seconds.
  • TFA trifluoroacetic acid
  • the amount of proteolysis is then determined by separation of noncleaved substrate and two cleaved products with reverse-phase HPLC, while measuring absorbance at 220 nm to determine the relative peak areas of the three components. The relative peak areas are used to calculate % conversion to product as a function of inhibitor concentration.
  • Test compounds were added to produce the desired concentration of drug and 0.2% DMSO in a final volume of 200 ⁇ l. Uninfected parallel cultures were maintained for XTT cytotoxicity assay at 7 days post infection. Cultures were tested for viral replication by reverse transcriptase assay at 4 and 7 days post infection.

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EP95900457A 1993-11-19 1994-10-26 Pyron derivate als protease inhibitoren und antivirusmittel Withdrawn EP0729466A1 (de)

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TW587079B (en) * 1998-09-25 2004-05-11 Almirall Prodesfarma Ag 2-phenylpyran-4-one derivatives
PE20011333A1 (es) 2000-03-16 2002-01-16 Almirall Prodesfarma Ag Derivados de 2-fenilpiran-4-ona como inhibidores de ciclooxigenasa 2
ES2844184T3 (es) * 2016-06-14 2021-07-21 Bristol Myers Squibb Co 4-hidroxi-3-sulfonilpiridin-2(1H)-onas como agonistas del receptor de APJ
KR102384668B1 (ko) * 2016-06-14 2022-04-07 브리스톨-마이어스 스큅 컴퍼니 Apj 효능제로서의 6-히드록시-5-(페닐/헤테로아릴술포닐)피리미딘-4(1h)-온

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FR3724M (fr) * 1963-12-04 1965-12-06 Marcel Perrault Médicament a base d'anisoyl-3 hydroxy-4 p. méthoxy-phényl-6α-pyrone.
US3818046A (en) * 1972-12-18 1974-06-18 Dow Chemical Co Sulfur-containing hydroxy pyrones and alkali metal salts thereof
DE4308451A1 (de) * 1992-09-10 1994-04-14 Bayer Ag 3-Aryl-pyron-Derivate
ZA938019B (en) * 1992-11-13 1995-04-28 Upjohn Co Pyran-2-ones and 5,6-dihydropyran-2-ones useful for treating HIV and other retroviruses
JP3372338B2 (ja) * 1994-02-14 2003-02-04 オリンパス光学工業株式会社 測距装置

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AU8127694A (en) 1995-06-06
BG100564A (bg) 1996-12-31
IL111671A0 (en) 1995-01-24
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