作者:Wolfgang Oppolzer、Jean-Pierre Barras
DOI:10.1002/hlca.19870700703
日期:1987.11.4
Pure (E)- or (Z)-enoylsultams 2 were Oxidized with OsO4/N-Methylmorpholine N-oxide in a stereospecific and highly π-face-selective manner. Acetalization of the resulting 1,2-diols furnished, after purification, the stable, crystalline acetals 6 in >99% d.e. and in 63–74% overall yield from 2. Reductive or hydrolytic cleavage of 6 gave enantiomerically pure alcohols 8 or carboxylic acids 9 with recovery
用OsO 4 / N-甲基吗啉N-氧化物以立体有择且高度π面选择性的方式将纯净的(E)-或(Z)-烯酰基阿磺酰胺2氧化。纯化后得到的1,2-二醇的缩醛化反应提供了稳定的结晶乙缩醛6,其> 99%de的产率为63-74%,总产率为2。6的还原或水解裂解得到对映体纯的醇8或羧酸9,同时回收了苏丹助剂1。