作者:John Fawcett、Stuart House、Paul R. Jenkins、Nicholas J. Lawrence、David R. Russell
DOI:10.1039/p19930000067
日期:——
LDA and allowed to react with acetaldehyde, isobutyraldehyde, and trimethylacetaldehyde to give β-hydroxy sulfoxides with moderate diastereoselectivity. The sulfoxide 1 gave the best selectivity with the larger aldehyde. The same diastereoselectivity, within experimental error, is observed in the reactions with trimethylacetaldehyde of both E-1 and Z-1 giving 85:15 and 84:16 mixtures of 2c and 3c respectively;
用LDA使纯手性甲基对甲苯磺酸对亚磺酸酯或亚磺酰基恶唑烷二酮8a和9a处理乙烯基格氏试剂合成一系列高手性乙烯基亚砜,使其与乙醛,异丁醛和三甲基乙醛反应生成β-羟基亚砜中度非对映选择性。亚砜1与较大的醛具有最佳的选择性。在与E - 1和Z - 1的三甲基乙醛反应中观察到相同的非对映选择性,得到2c和3c的85:15和84:16混合物分别; 显然,乙烯基的几何形状不会影响选择性。