Asymmetric synthesis of vicinal thioether alcohols by diastereoselective 1,2-addition of carbon nucleophiles to enantiomerically enriched α-sulfenylated aldehydes
作者:Dieter Enders、Olivier Piva、Frank Burkamp
DOI:10.1016/0040-4020(95)01040-8
日期:1996.2
Optically active α-sulfenylated aldehydes , readily available by asymmetric alkylation of α-sulfenylated acetaldehyde-SAMP-hydrazones followed by chemoselective oxidative removal of the chiral auxiliary, can be transformed into vicinal thioether alcohols 2, 5 and 6 by diastereoselective 1,2-addition using various carbon nucleophiles. The final compounds are obtained with high enantiomeric- (ee = 80
光学活性α-亚磺酰醛,由α-亚磺酰乙醛-SAMP-腙,接着化学选择性氧化除去手性助剂的不对称烷基化现成的,可转化为连位硫醚醇2,5和6通过非对映选择性1,2-加成使用各种碳亲核试剂。得到的最终化合物具有较高的对映体(ee = 80 – 97%)和非对映体过量(de = 88> 95%),化学收率很好(51 – 88%)。