The first chiral synthesis of (–)-oncinotine 1 in natural form has been achieved starting from the protected (S)-N-benzyloxycarbonyl-2-piperidylacetaldehyde 3 based on a new route involving 17-membered ring formation via iminium cyclization, which establishes the 17R absolute configuration of natural 1.
( - ) -的第一手性合成oncinotine 1天然形式已经实现从受保护的(起始小号) - ñ -苄氧羰基-2- piperidylacetaldehyde 3基于涉及17-元环形成一个新的路由经由
亚胺环化,它建立自然的17 R绝对构型1。