Asymmetric synthesis of 1-azaspiro[4.5]decanes via intramolecular dipolar cycloaddition of nitrones containing the bornane-10,2-sultam chiral auxiliary
作者:Mark C Bagley、Wolfgang Oppolzer
DOI:10.1016/s0957-4166(00)00205-6
日期:2000.6
3-dipolar cycloaddition of a cyclic nitrone, prepared by an asymmetric electrophilic enolate hydroxyamination using the (2R)-bornane-10,2-sultam chiral auxiliary, proceeds to give bridged and fused cycloadducts with total diastereocontrol. Reduction of the fused isoxazolidine provides a 1-azaspiro[4.5]decane as a potential intermediate in the asymmetric synthesis of the cylindricine alkaloids.
通过不对称的亲电子烯醇式羟基胺化反应,使用(2 R)-降冰片烷-10,2-杜仲手性助剂制备的环内硝基化合物,通过分子内的1,3-偶极环加成反应得到桥联和稠合的环加合物,并具有总的非对映异构控制。还原的稠合的异恶唑烷的还原提供了1-azaspiro [4.5]癸烷,作为潜在的中间体,其不对称合成cylindricine生物碱。