WO2000037454A1 - Verfahren zur herstellung von 3-isochromanon - Google Patents
Verfahren zur herstellung von 3-isochromanon Download PDFInfo
- Publication number
- WO2000037454A1 WO2000037454A1 PCT/EP1999/009544 EP9909544W WO0037454A1 WO 2000037454 A1 WO2000037454 A1 WO 2000037454A1 EP 9909544 W EP9909544 W EP 9909544W WO 0037454 A1 WO0037454 A1 WO 0037454A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- acid
- reaction
- isochromanone
- formula
- bromine
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D311/00—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings
- C07D311/02—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings ortho- or peri-condensed with carbocyclic rings or ring systems
- C07D311/76—Benzo[c]pyrans
Definitions
- the present invention relates to a process for the preparation of optionally substituted 3-isochromanone starting from 2-halomethylphenylacetonitrile.
- 3-isochromanone is an important intermediate in the production of special crop protection agents, in particular fungicides of the strobilurin type known from EP-A-0 278 595.
- fungicides of the strobilurin type known from EP-A-0 278 595.
- Various processes are known from the literature for the preparation of 3-isochromanone.
- 3-isochromanone On a laboratory scale, the representation of 3-isochromanone is possible, for example, via a Baeyer-Villiger oxidation of 2-indanone. From Synthesis 1973, 107 it is known to oxidize 2-indanone in the presence of hydrogen peroxide, sulfuric acid and acetic anhydride. The disadvantage here is that the 3-isochromanone in one
- 3-isochromanone can also be obtained from 2-methoxycarbonylmethylbenzoic acid by reaction with a) ethyl chloroformate in triethylamine and b) with sodium borohydride (Chem. Pharm. Bull. 16 (1968), 492, 496). Also by reaction from
- Another way of preparing 3-isochromanone comprises two stages: First, o-tolylacetic acid is reacted with N-bromosuccinimide (NBS) to form 2-bromomethylphenylacetic acid, and then this 2-bromomethylphenylacetic acid is ring-closed in a basic medium to form 3- Isochromanon (Zh. Org. Khim. 9 (1973), 2145).
- NBS N-bromosuccinimide
- Isochromanon Zh. Org. Khim. 9 (1973), 2145
- the process can be improved by reacting o-tolylacetic acid with sulfuryl chloride and azo-bis-isobutyronitrile (AIBN) as radical initiators in the first step.
- AIBN azo-bis-isobutyronitrile
- the 2-chloromethylphenylacetic acid formed is converted into 3-isochomanone using a base.
- the first step takes place in an inert solvent at temperatures of 50-90 ° C.
- conventional bases such as alkali or alkaline earth metal hydroxides and alkali metal carbonates can be used as bases be used.
- a disadvantage of this process is the low overall yields of 49 to 60%.
- the object of the present invention was to provide an improved process which enables the production of 3-isochomanone in a process-technically simple and safety-safe manner with high yields.
- R 1 , R 2 , R 3 and R 4 are the same or different and are H, halogen, OH or OR 5 , where R 5 is C r C 4 alkyl, or R 1 and R 2 or R 2 and R 3 or R 3 and R 4 together form a C3 or C ⁇ alkylene radical or a C 3 or C 4 alkenyl radical and X represents chlorine or bromine.
- Hydrochloric acid or hydrobromic acid is preferably used as the hydrohalic acid in the process according to the invention.
- R 1 , R 2 , R 3 and R 4 are preferably identical or different and stand for H or halogen, in particular chlorine or bromine.
- all four radicals R 1 to R 4 are hydrogen or one of the four radicals is chlorine or bromine, while the three remaining radicals are hydrogen.
- the reaction of the 2-halomethylphenylacetonitrile of the formula II with the hydrohalic acid is an acidic hydrolysis and thus takes place at a pH of 0-7, preferably 0.5-5, in particular 1.5-4.5.
- the reaction temperature is 70-150 ° C, preferably 80-120 ° C and in particular 90-110 ° C.
- the molar ratio of the 2-halomethylphenylacetonitrile of the formula II with the hydrohalic acid is an acidic hydrolysis and thus takes place at a pH of 0-7, preferably 0.5-5, in particular 1.5-4.5.
- the reaction temperature is 70-150 ° C, preferably 80-120 ° C and in particular 90-110 ° C.
- the ratio of hydrohalic acid to 2-halomethylphenylacetonitrile is (0.1-10): 1, preferably (0.5-5): 1 and in particular (3-5): 1.
- No solvent is required to carry out the reaction. If a solvent is used, preference is given to using the solvent which, after the reaction, is also used to extract the 3-isochromanone from the water phase.
- Organic solvents such as toluene, methylene chloride, chlorobenzene or fluorobenzene are usually used.
- 2-halomethylphenylacetic acid and, in equilibrium therewith, 2-hydroxymethylphenylacetic acid, which both cyclize to 3-isochromanone, are first formed from the 2-halomethylphenylacetonitrile. It is therefore important that the pH value of 0-7 is maintained during the course of the reaction. It has even proven to be particularly favorable to keep the pH value in the course of the reaction within the predetermined value range, i.e. to a pH of at most 7, preferably at most 5 and in particular at most 4.5, in order to obtain the 3-isochromanone quantitatively. This is achieved by diluting the system with water or partial neutralization with an alkali metal base, preferably NaOH or KOH.
- an alkali metal base preferably NaOH or KOH.
- reaction mixture vigorously, so that the shortest possible reaction time of usually 2-24 hours can be achieved.
- the reaction can be further accelerated by adding catalytic amounts of an alkali metal iodide, in particular potassium iodide, or hydroiodic acid.
- the process according to the invention is characterized in that it enables the production of 3-isochromanone in yields of at least 90%. Because of this high yield, undesirable by-products only arise in small amounts, in particular the formation of the biodegradable dibenzyl ethers is avoided.
- 2-halomethylphenylacetonitriles of the formula I can be prepared by photohalogenation of the corresponding 2-methylphenylacetonitriles in organic-aqueous systems at a pH from -1 to +7.
- This procedure is the subject of a German patent application filed on the same day.
- the photochlorination of 2-methylphenylacetonitrile is carried out at a temperature of -10 to + 30 ° C, while the corresponding photobromination takes place at +10 to + 60 ° C.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU30358/00A AU3035800A (en) | 1998-12-18 | 1999-12-07 | Method for producing 3-isochromanone |
GB0115218A GB2361475B (en) | 1998-12-18 | 1999-12-07 | Method for producing 3-isochromanone |
DE19982749T DE19982749D2 (de) | 1998-12-18 | 1999-12-07 | Verfahren zur Herstellung von 3-Isochromanon |
SE0101989A SE526012C2 (sv) | 1998-12-18 | 2001-06-06 | Förfarande för framställning av 3-isokromanon |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19858738.4 | 1998-12-18 | ||
DE1998158738 DE19858738C2 (de) | 1998-12-18 | 1998-12-18 | Verfahren zur Herstellung von 3-Isochromanon |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000037454A1 true WO2000037454A1 (de) | 2000-06-29 |
Family
ID=7891750
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1999/009544 WO2000037454A1 (de) | 1998-12-18 | 1999-12-07 | Verfahren zur herstellung von 3-isochromanon |
Country Status (5)
Country | Link |
---|---|
AU (1) | AU3035800A (de) |
DE (2) | DE19858738C2 (de) |
GB (1) | GB2361475B (de) |
SE (1) | SE526012C2 (de) |
WO (1) | WO2000037454A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1116720A1 (de) * | 1998-09-21 | 2001-07-18 | Showa Denko K.K. | Verfahren zur herstellung von isochromanonen und zwischenprodukten für deren herstellung |
CN104387375A (zh) * | 2014-09-24 | 2015-03-04 | 中国药科大学 | 硫化氢供体型异色满酮类衍生物、其制备方法及用途 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000017187A1 (fr) * | 1998-09-21 | 2000-03-30 | Showa Denko K.K. | Procede de preparation d'isochromanones et intermediaires utilises pour leur preparation |
-
1998
- 1998-12-18 DE DE1998158738 patent/DE19858738C2/de not_active Expired - Fee Related
-
1999
- 1999-12-07 GB GB0115218A patent/GB2361475B/en not_active Expired - Fee Related
- 1999-12-07 DE DE19982749T patent/DE19982749D2/de not_active Expired - Fee Related
- 1999-12-07 WO PCT/EP1999/009544 patent/WO2000037454A1/de active Application Filing
- 1999-12-07 AU AU30358/00A patent/AU3035800A/en not_active Abandoned
-
2001
- 2001-06-06 SE SE0101989A patent/SE526012C2/sv not_active IP Right Cessation
Non-Patent Citations (6)
Title |
---|
N. S. NARASIMHAN ET AL.: "Synthetic application of lithiation reactions - XVI. Syntheses of (+/-)-tetrahydropalmatine, (+/-)-canadine, (+/-)-stylopine and (+/-)-sinactine", TETRAHEDRON, vol. 39, no. 12, 1983, pages 1975 - 1982, XP000887123 * |
S. D. PATIL, R. S. MALI: "A Convenient Total Synthesis of (+/-)-Bharatamine & (+/-)-Isobharatamine", INDIAN J. CHEM. SECT. B, vol. 24, 1985, pages 360 - 362, XP000614056 * |
S. MURAHASHI: "Über einige neue Derivate des o-Xylols", SCI. PAP. INST. PHYS. CHEM. RES. JPN., vol. 30, 1936, pages 180 - 194, XP000885921 * |
S. P. KANAPURE ET AL.: "An improved synthesis of 7-methoxyisochroman-3-one", SYNTH. COMMUN., vol. 14, no. 13, 1984, pages 1205 - 1212, XP000885993 * |
S. P. KHANAPURE, E. R. BIEHL: "Preparation of 4-Alkyl and 4-Aryl Derivatives of (6-Acetoxymethyl)isochroman-3-one", J. ORG. CHEM., vol. 52, no. 7, 1987, pages 1333 - 1337, XP002109340 * |
S. P. KHANAPURE, E. R. BIEHL: "Preparation of Novel 4-Substituted 6-Methoxy-, 6,7-Dimethoxy-, and 6,7-(Methylendioxy)isochroman-3-ones. 2", J. ORG. CHEM., vol. 55, no. 5, 1990, pages 1471 - 1475, XP000885937 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1116720A1 (de) * | 1998-09-21 | 2001-07-18 | Showa Denko K.K. | Verfahren zur herstellung von isochromanonen und zwischenprodukten für deren herstellung |
EP1116720A4 (de) * | 1998-09-21 | 2002-09-25 | Showa Denko Kk | Verfahren zur herstellung von isochromanonen und zwischenprodukten für deren herstellung |
CN104387375A (zh) * | 2014-09-24 | 2015-03-04 | 中国药科大学 | 硫化氢供体型异色满酮类衍生物、其制备方法及用途 |
Also Published As
Publication number | Publication date |
---|---|
SE0101989L (sv) | 2001-06-06 |
SE526012C2 (sv) | 2005-06-14 |
GB2361475A (en) | 2001-10-24 |
DE19858738A1 (de) | 2000-06-21 |
DE19982749D2 (de) | 2002-01-24 |
SE0101989D0 (sv) | 2001-06-06 |
GB2361475B (en) | 2004-04-07 |
AU3035800A (en) | 2000-07-12 |
GB0115218D0 (en) | 2001-08-15 |
DE19858738C2 (de) | 2001-03-22 |
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