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. This reaction is promoted by the use of strong mineral acids, sulphonic acids, acidic zeolites or Lewis acids.
Indanones and Indenols from 2-Alkylcinnamaldehydes via the Intramolecular Friedel−Crafts Reaction of Geminal Diacetates
作者:Gary B. Womack、John G. Angeles、Vincent E. Fanelli、Brinda Indradas、Roger L. Snowden、Philippe Sonnay
DOI:10.1021/jo900910b
日期:2009.8.7
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.
PROCESS FOR PRODUCING INDENOL ESTERS OR ETHERS
申请人:FIRMENICH SA
公开号:EP1756027A2
公开(公告)日:2007-02-28
US7250528B2
申请人:——
公开号:US7250528B2
公开(公告)日:2007-07-31
[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.