PROCESS FOR PRODUCING OPTICALLY ACTIVE 4-CHLORO-3-HYDROXYBUTANAL COMPOUND
申请人:Hayashi Yujiro
公开号:US20130217901A1
公开(公告)日:2013-08-22
The invention relates to a method of producing optically active 4-chloro-3-hydroxybutanal compound (2) by reacting chloroacetaldehyde with aldehyde compound (1) in the presence of optically active pyrrolidine compound (5).
wherein each symbol is as defined in the specification.
Process for producing chiral hydroxyaldehyde compounds
申请人:Mitsui Chemicals, Inc.
公开号:US07402710B2
公开(公告)日:2008-07-22
An industrial process for producing hydroxyaldehydes efficiently, by solving the problems of conventional DERA, such as low stability against aldehydes, low catalytic activity for aldol condensation, and the difficulty of controlling the number of acetaldehyde molecules to be condensed, is provided.
According to the process, aldol condensation of a substituted or unsubstituted aliphatic aldehyde compound having 2 to 6 carbon atoms with acetaldehyde is conducted by using D-2-deoxyribose-5-phosphate aldolase which is highly stable against aldehydes and has high catalytic activity for aldol condensation, whereby a hydroxyaldehyde compound having the number of carbon atoms increased by two or four can be produced.
Diarylprolinol with Trifluoromethyl Substituents and Diphenylprolinol‐Derived Perfluoroalkanesulfonamide as Organocatalysts in the Cross‐Aldol Reaction of Aldehydes
作者:Yujiro Hayashi、Masashi Tomikawa、Naoki Mori
DOI:10.1002/adsc.202200266
日期:2022.10.4
different aldehydes is a synthetically relevant reaction. Diarylprolinol catalyst with trifluoromethyl substituents and sulfonamide catalyst derived from diphenylprolinol are organocatalysts for the cross-aldol reaction. The reactivity and stereoselectivity of these two catalysts were compared in the asymmetric cross-aldol reactions of propanal and acetaldehyde as nucleophilic aldehydes and several