Highly enantioselective quaternary carbon formation (96% enantiomeric excess) is achieved by the Pummerer-type reaction of a chiral vinylic sulphoxide with allylmagnesium bromide; this method is applied to the synthesis of (–)-sibirine.
手性
乙烯基亚砜与
烯丙基溴化镁的Pummerer型反应可实现高度对映选择性的季碳形成(对映体过量96%)。此方法适用于(-)-sibirine的合成。