[EN] PREPARATION OF 3,3-DIALKXOY-1-METHYLENEPROPYL ARENES<br/>[FR] PRÉPARATION DE 3,3-DIALKOXY-1-MÉTHYLÈNEPROPYL ARÈNES
申请人:LONZA AG
公开号:WO2012150281A1
公开(公告)日:2012-11-08
The invention discloses a method for the preparation of 3,3-dialkxoy-1-methylenepropyl arenes from crotonaldehyde and aryldiazonium salts, and intermediates for the preparation of perfumes.
[EN] PREPARATION OF 4,4-DIALKOXY-1-BUTEN-1-YLARENES<br/>[FR] PRÉPARATION DE 4,4-DIALCOXY-1-BUTÈNE-1-YLARÈNES
申请人:LONZA AG
公开号:WO2012150280A3
公开(公告)日:2013-01-10
Direct C-4 arylation of crotonaldehyde with arenediazonium tetrafluoroborates
作者:Florencio Zaragoza、Verena Heinze
DOI:10.1016/j.tetlet.2011.07.005
日期:2011.9
Arenediazonium tetrafluoroborates react with crotonaldehyde (2-butenal) in methanol in the presence of catalytic amounts of Pd(OAc)(2) to yield mainly 4,4-dimethoxy-1-butenylarenes. In most of the examples studied, small amounts of an isomeric byproduct were formed, presumably 3,3-dimethoxy-1-methylene-propylarenes. Because crotonaldehyde and arenediazonium salts are cheap and readily available, this reaction is a convenient access to protected 4-arylbutenals. (C) 2011 Elsevier Ltd. All rights reserved.