Indanones and Indenols from 2-Alkylcinnamaldehydes via the Intramolecular Friedel−Crafts Reaction of Geminal Diacetates
摘要:
When treated with Ac(2)O at rt in the presence of 4-6 mol% FeCl(3), 2-alkylcinnamaldehydes are converted to 2-alkyl-1H-inden-1-yl acetates through the intermediacy of gemdiacetates. Methanolysis of the indenyl acetates yields the corresponding indenols, Saponification yields 2-alkylindanones, providing, in effect, an intramolecular acylation employing catalytic levels of acid.
The present invention relates to a process for making indenol esters or ether from an α-substituted cinnamic aldehyde derivative such as an acetal or an acylal. Said reaction is promoted by the use of strong mineral acids, sulphonic acids, acidic zeolites or Lewis acids.
[EN] PROCESS FOR PRODUCING INDENOL ESTERS OR ETHERS<br/>[FR] PROCEDE D'ELABORATION D'ESTERS OU D'ETHERS D'INDENOL
申请人:FIRMENICH & CIE
公开号:WO2005113473A2
公开(公告)日:2005-12-01
The present invention relates to a process for making indenol esters or ether from an α-substituted cinnamic aldehyde derivative such as an acetal or an acylal. Said reaction is promoted by the use of strong mineral acids, sulphonic acids, acidic zeolites or Lewis acids.