diastereo- and regio-selectivity. 31 P NMR studies showed the formation of an intermediate hemiacetal and rapid formation of the organomercurial upon addition of mercuric trifluoroacetate. However, the oxymercuration was reversible, and attempts to remove the excess aldehyde often led to recovery of the starting material. Fortunately, reduction of the organomercurial intermediate with sodium cyanoborohydride
用
三氟乙酸汞在醛溶液中处理烯丙基羟基
膦酸酯,然后还原有机
汞中间体,得到环状
缩醛衍
生物。该反应显示出高的非对映选择性和区域选择性。31 P NMR 研究表明,加入
三氟乙酸汞后,中间体
半缩醛的形成和有机
汞醛的快速形成。然而,氧
汞化是可逆的,并且试图去除过量的醛通常会导致原材料的回收。幸运的是,在醛的存在下用
氰基硼氢化钠还原有机
汞中间体导致了更高的重现性产率。