Intramolecular Michael-Type Additions to Vinyl Bissulfoxides: Enantioselective Synthesis of Chiral Aldehydes
作者:Joachim Podlech、Timo Gehring、Alexander Rothenberger
DOI:10.1055/s-2008-1067176
日期:2008.8
The diastereoselective auxiliary-based intramolecular Michael-type additions to alkylidene bissulfoxides derived from dithiane and dithiolane were investigated. Utilization of substrates bearing N- and O-nucleophilic functions led to the formation of the respective cyclic substrates with selectivities ranging from 51:49 to 85:15. Cleavage of the bissulfoxide moiety by a two-step sequence yielded chiral
研究了衍生自二噻烷和二硫杂环戊烷的亚烷基双亚砜的非对映选择性辅助分子内迈克尔型加成。利用具有 N- 和 O- 亲核功能的底物导致形成各自的环状底物,其选择性范围为 51:49 至 85:15。通过两步序列裂解双亚砜部分产生手性甲醛。通过该方法获得的对映体纯化合物,例如四氢吡喃-2-甲醛和高哌啶醛,很难通过其他途径获得。目标分子的两种对映异构体都是可用的,因为立体化学信息是通过容易获得的 D-和 L-酒石酸二乙酯引入的。