dialkoxyboranes derived from thioesters were found to be stereoconvergent: both Z and E enolates give syn aldol condensation products. The thioester additions to chiral aldehydes were studied. Internal selectivity (syn) was usually very high, while the relative stereoselectivity ranged from poor to good, depending on the specific aldehyde used. The aldol products were transformed to known compounds for correlation
Nucleophilic Addition of α-Metallated Carbamates to Planar Chiral Cationic η<sup>3</sup>-Allylmolybdenum Complexes: A Stereochemical Study
作者:Philip Kocienski、John Christopher、Richard Bell、Bernhard Otto
DOI:10.1055/s-2004-834917
日期:——
Chiral α-(O-carbamoyl)alkyl- and α-(N-carbamoyl)alkylcopper(I) reagents derived from (-)-sparteine-mediated asymmetric lithiation of hindered carbamates react with cationic η 3 -allylmolybdenum complexes with retention of configuration.
衍生自 (-)-sparteine 介导的受阻氨基甲酸酯不对称锂化的手性 α-(O-氨基甲酰基)烷基-和 α-(N-氨基甲酰基)烷基铜 (I) 试剂与阳离子 η 3 -烯丙基钼配合物反应,并保留构型。
Acyclic stereoselection. 2. Synthesis of 3-hydroxy-2-methyl- and 3-hydroxy-2,4-dimethylcarboxylic acids
作者:Charles T. Buse、Clayton H. Heathcock
DOI:10.1021/ja00466a085
日期:1977.11
Acyclic stereoselection. 50. New stereoselective propanal/propanoic acid synthons for aldol reactions
作者:Ichiro Mori、Kazuaki Ishihara、Clayton H. Heathcock