New cycloaliphatic unsaturated ketones and their use as perfuming and odour-modifying agents in the manufacture of perfumes and perfumed products, and as flavouring and taste-modifying agents in the preparation of foodstuffs in general and imitation flavours for foodstuffs, beverages, animal feeds, pharmaceutical preparations and tobacco products. Methods for the preparation of said cycloaliphatic unsaturated ketones.
Cycloaliphatic unsaturated ketones as odor and taste modifying agents in
申请人:Firmenich SA
公开号:US04187863A1
公开(公告)日:1980-02-12
New cycloaliphatic unsaturated ketones used as flavoring and taste modifying agents in tobacco products.
新的环状脂肪族不饱和酮被用作调味和改善烟草产品口感的剂。
Flavoring with cycloaliphatic unsaturated ketones
申请人:Firmenich SA
公开号:US04226892A1
公开(公告)日:1980-10-07
New cycloaliphatic unsaturated ketones and their use as perfuming and odor-modifying agents in the manufacture of perfumes and perfumed products, and as flavoring and taste-modifying agents in the preparation of foodstuffs in general and imitation flavors for foodstuffs, beverages, animal feeds, pharmaceutical preparations and tobacco products. Methods for the preparation of said cycloaliphatic unsaturated ketones.
作者:Valentina Merlini、Sylvain Gaillard、Alessio Porta、Giuseppe Zanoni、Giovanni Vidari、Steven P. Nolan
DOI:10.1016/j.tetlet.2011.01.010
日期:2011.3
A simple and convenient synthesis of a-ionone, an important component of flowers and fragrances, is reported. The key step in the formation of the a.,p-unsaturated ketone moiety involves an NHC-Au-1 catalyzed Meyer-Schuster-like rearrangement of readily prepared propargylic esters. The complex [Au(IPr)}(2)(mu-OH)][BF4] proved to be the most efficient catalyst leading to a-ionone in 70% yield from a propargylic benzoate. This optimized procedure represents a valuable and attractive alternative to classical methods leading to alpha,beta-unsaturated ketones, such as the Wittig or aldol reactions. (C) 2011 Elsevier Ltd. All rights reserved.
STORK, G.;BAINE, N. H., J. AMER. CHEM. SOC., 1982, 104, N 8, 2321-2323