Generation of chromioenamines by reduction of O-acetyloximes with chromium(ii) and their application
作者:Kazuhiko Takai、Noriko Katsura、Yuji Kunisada
DOI:10.1039/b105357b
日期:——
Chromioenamines can be generated by treatment of O-acetyloximes with chromium(II) via two steps of one-electron reduction and successive isomerization, and the species react with aldehydes to give gamma-amino alcohols after reduction with LiAlH4.
FeCl<sub>3</sub>·6H<sub>2</sub>O-Catalyzed Mukaiyama-Aldol Type Reactions of Enolizable Aldehydes and Acetals
作者:Alejandra Rodríguez-Gimeno、Ana B. Cuenca、Jesús Gil-Tomás、Mercedes Medio-Simón、Andrea Olmos、Gregorio Asensio
DOI:10.1021/jo501498a
日期:2014.9.5
stable catalyst, lead to β-methoxycarbonyl compounds with nearly quantitative yields. The methodology is extended to the parent aldehydes as starting materials, leading to the corresponding aldols with lower yields, but efficiently. Different alkyl and aryl substituted acetals and aldehydes have been tested in the reaction with linear and cyclic silyl enolethers. Reactions are carried out in an open air
Tandem Application of C–C Bond-Forming Reactions with Reductive Ozonolysis
作者:Rachel Willand-Charnley、Patrick H. Dussault
DOI:10.1021/jo3015775
日期:2013.1.4
Several variants of reductiveozonolysis, defined here as the in situ generation of aldehydes or ketones during ozonolytic cleavage of alkenes, are demonstrated to work effectively in tandem with a number of C–C bond-forming reactions. For reactions involving basic nucleophiles (1,2-addition of Grignard reagents, Wittig or Horner–Emmons olefinations, and directed aldol reactions of lithium enolates)
The Chemistry of Trichlorosilyl Enolates. 2. Highly-Selective Asymmetric Aldol Additions of Ketone Enolates
作者:Scott E. Denmark、Ken-Tsung Wong、Robert A. Stavenger
DOI:10.1021/ja9636698
日期:1997.3.1
problem, namely, the invention/discovery of asuitable chiral Lewis acid catalyst to effect the reaction betweenan enoxysilane derivative and an aldehyde, Scheme 1 (X ) Me).In a recent Communication we have described a conceptuallydistinct approach which employs chiral Lewis bases (phos-phoramides) in combination with trichlorosilyl enolates, Scheme1(X)Cl).
A catalytic amount of KF.18-crown-6 complex is effective as a soluble fluoride source to activate an asymmetric Sakurai-Hosomi allylation with BINAP and silver(I) triflate catalyst. The allylation of a variety of aromatic, alpha,beta-unsaturated and aliphatic aldehydes with allylic trimethoxysilane resulted in high yields and remarkable enantioselectivities. In addition, the asymmetric Mukaiyama-type