Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C253/00—Preparation of carboxylic acid nitriles
  • C07C253/14—Preparation of carboxylic acid nitriles by reaction of cyanides with halogen-containing compounds with replacement of halogen atoms by cyano groups
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C255/00—Carboxylic acid nitriles
  • C07C255/01—Carboxylic acid nitriles having cyano groups bound to acyclic carbon atoms
  • C07C255/32—Carboxylic acid nitriles having cyano groups bound to acyclic carbon atoms having cyano groups bound to acyclic carbon atoms of a carbon skeleton containing at least one six-membered aromatic ring
  • C07C255/34—Carboxylic acid nitriles having cyano groups bound to acyclic carbon atoms having cyano groups bound to acyclic carbon atoms of a carbon skeleton containing at least one six-membered aromatic ring with cyano groups linked to the six-membered aromatic ring, or to the condensed ring system containing that ring, by unsaturated carbon chains
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C303/00—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides
  • C07C303/26—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides of esters of sulfonic acids
  • C07C303/30—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides of esters of sulfonic acids by reactions not involving the formation of esterified sulfo groups
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C319/00—Preparation of thiols, sulfides, hydropolysulfides or polysulfides
  • C07C319/14—Preparation of thiols, sulfides, hydropolysulfides or polysulfides of sulfides
  • C07C319/20—Preparation of thiols, sulfides, hydropolysulfides or polysulfides of sulfides by reactions not involving the formation of sulfide groups
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D317/00—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms
  • C07D317/08—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3
  • C07D317/44—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3 ortho- or peri-condensed with carbocyclic rings or ring systems
  • C07D317/46—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3 ortho- or peri-condensed with carbocyclic rings or ring systems condensed with one six-membered ring
  • C07D317/48—Methylenedioxybenzenes or hydrogenated methylenedioxybenzenes, unsubstituted on the hetero ring
  • C07D317/50—Methylenedioxybenzenes or hydrogenated methylenedioxybenzenes, unsubstituted on the hetero ring with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to atoms of the carbocyclic ring
  • C07D317/58—Radicals substituted by nitrogen atoms
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D317/00—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms
  • C07D317/08—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3
  • C07D317/44—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3 ortho- or peri-condensed with carbocyclic rings or ring systems
  • C07D317/46—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3 ortho- or peri-condensed with carbocyclic rings or ring systems condensed with one six-membered ring
  • C07D317/48—Methylenedioxybenzenes or hydrogenated methylenedioxybenzenes, unsubstituted on the hetero ring
  • C07D317/50—Methylenedioxybenzenes or hydrogenated methylenedioxybenzenes, unsubstituted on the hetero ring with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to atoms of the carbocyclic ring
  • C07D317/60—Radicals substituted by carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D317/00—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms
  • C07D317/08—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3
  • C07D317/44—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3 ortho- or peri-condensed with carbocyclic rings or ring systems
  • C07D317/46—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3 ortho- or peri-condensed with carbocyclic rings or ring systems condensed with one six-membered ring
  • C07D317/48—Methylenedioxybenzenes or hydrogenated methylenedioxybenzenes, unsubstituted on the hetero ring
  • C07D317/62—Methylenedioxybenzenes or hydrogenated methylenedioxybenzenes, unsubstituted on the hetero ring with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to atoms of the carbocyclic ring
  • C07D317/68—Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen

Definitions

• the present invention relates to a cheaper and practical protocol for the preparation of compounds of formula A, its isomers and their structural analogues in a one pot and single step via hydrocyanation reaction of compound of general formula I with good yields.
• Aryl nitriles can be prepared by the cyanation of aryl halides with an excess of copper(I) cyanide in a polar high-boiling solvent such as DMF, nitrobenzene, or pyridine at reflux temperature using Rosenmund-von Braun Reaction.
• Alpha beta unsaturated nitriles are versatile reagents which have been used extensively in the synthesis of heterocycle compounds. Synthesis of cinnamonitrile by treating benzaldehyde with acetonitrile in presence of alkali is disclosed in Organic Syntheses, Coll. Vol. 7, p.108 (1990); Vol. 62, p.179 (1984).
• cinnamonitrile and their esters have wide range of industrial applications for example in cosmetic industry.
• cinnamonitriles Although few inventions have been made in the synthesis of cinnamonitrile they require multiple steps with consumption of large quantities of hazardous chemicals with less efficiency and narrow substrate scope. Therefore, there is a need in the art to provide an alternate and effective synthesis to provide a library of cinnamonitrile. Further it would be desirable have a process of synthesis of cinnamonitriles by a convenient single step one pot process. Specifically, it would be desirable to provide a simple process for the conversion of dibromovinyl benzenes to their corresponding cinnamonitriles.
• the main object of the present invention is to provide an effective one pot synthesis, single step for the preparation of cinnamonitrile derivatives via hydrocyanation reaction with good yields.
• R 1 is hydrogen
• R 2 is selected from H, OMe, OTs, OBn;
• R 3 is selected from H, OMe, OTs, OBn, N0 2 ;
• R 4 is selected from H, OMe, F
• R 5 is selected from H, N02, BR;
• R 5 is selected from H, N02, CN;
• R 2 and R 3 can together be selected as -0-CH 2 -0-; comprising the steps of reacting compound of formula I with CuCN in DMF, under reflux in presence of N 2 atmosphere to obtain the desired compound of formula A in the range of 50-90% yield.
• the said compound of formula I and CuCN are in the ratio of 1 :2 to 1:3.
• isomers of compound of formula A are trans and cis isomers in the ratio of 3:1 to 10:1.
• the reaction is carried out at a temperature ranging from 140 to 160 °C. In yet another embodiment of the present invention, the reaction is carried out for a time ranging from 10 to 15 hours.
• the instant invention provides one pot single step synthesis, of CuCN- mediated hydrocyanation reaction, for the preparation of cinnamonitrile derivatives.
• the CuCN- mediated hydrocyanation reaction according to the invention essentially makes use of the conditions prescribed for Rosenmund-von Braun Reaction.
• the process of the present invention is easier to adopt on industrial scale for preparation of library of cinnamonitrile derivatives as it involves a one pot hydrocyanation reaction.
• the process of the instant invention is cost effective when compared to the existing methods as it involves CuCN, a very cheaper reagent, easy to maintain and perform at higher scales, showed remarkably broad substrate scope and good functional group tolerance and do not cause much effluent generation.
• the procedure tolerates a series of functional groups, such as methoxyl, fluoro etc.
• cinnamonitrile derivative of formula (A) is represented as enlisted herein:
• R 1 is hydrogen
• R 3 is selected from H, OMe, OTs, Obn, N0 2 ;
• R 4 is selected from H, OMe, F
• R 5 is selected from H, N02, CN;
• R 2 and R 3 can together be selected as -O-CH 2 -O-;
• the compound of Formula I is
• R 1 is hydrogen
• R 2 is selected from H, OMe, OTs, OBn;
• R 3 is selected from H, OMe, OTs, OBn, N0 2
• R 4 is selected from H, OMe, F
• R 5 is selected from H, N02, BR ;
• R 2 and R 3 can together be selected as -O-CH
• the invention discloses preparation of cinnamonitrile derivatives, which process comprises treating substituted 2,2-dibromovinyl benzene with CuCN in DMF at 150 °C for 10- 15 hrs to obtain substituted cinnamonitrile derivative in a single step.
• the bromo vinyl benzene andCuCN are used in the ratio of 1 :2 to 1 :3 in the process described herein. The reaction is shown in scheme below:
• R is selected from F, H, Br, OMe, OTs, OBn, N0 2, -0-CH 2 -O-.
• a typical procedure for the preparation of 3-(2- cyano-4,5-dimethoxyphenyl)acrylonitrile by refluxing a stirred solution of 1 -bromo-2-(2,2- dibromovinyl)-4,5-dimethoxybenzene or l-bromo-2-ethynyl-4,5-dimethoxybenzene in DMF with the addition of CuCN under N 2 atmosphere for 12 h (monitored by TLC).
• the reaction mixture is cooled to room temperature followed by workup of the reaction mixture to obtain crude products which can be purified by column chromatography to get 3-(2-cyano-4,5-dimethoxyphenyl)acrylonitrile in 63 % yield.
• the present invention discloses preparation of a library of compounds of cinnamonitrile derivatives by employing the process of the present invention.
• the reactants and the compounds obtained by the process of the invention is described herein below in tables 1 .
• Solvents were purified and dried by standard procedures before use; petroleum ether of boiling range 60-80 °C was used. Melting points are uncorrected. Infrared spectra were recorded on Shimadzu FTIR- 8400 spectrometer. ⁇ NMR and 13 C NMR were recorded on Bruker AV-200, AV-400 & AV-500 NMR spectrometers, respectively. Elemental analysis was carried on a Carlo Erba CHNS-0 analyzer. Purification was done using column chromatography (230-400 mesh).
• the dibromoolefines l(a-n) (1 mmol) was taken in dry DMF (10 raL) and CuCN (3 mmol) was added to it and the entire solution refluxed under N 2 for 12 h (monitored by TLC). The reaction mixture was then cooled to room temperature, and diluted with water (30 raL) and EtOAc (25 mL). The organic layer was separated and the aqueous layer was extracted with EtOAc (3 x 20 mL). The combined organic extracts were washed with brine and dried over anhyd.
• O-cyanocinnamonitrile and their esters have wide range of industrial applications for example in cosmetic industry.

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