Diastereoselective synthesis of pitavastatin calcium via bismuth-catalyzed two-component hemiacetal/oxa-Michael addition reaction
作者:Fangjun Xiong、Haifeng Wang、Lingjie Yan、Lingjun Xu、Yuan Tao、Yan Wu、Fener Chen
DOI:10.1039/c5ob01148e
日期:——
An efficient and concise asymmetric synthesis of pitavastatin calcium (1) starting from commercially available (S)-epichlorohydrin is described. A convergent C1 + C6 route allowed for the assembly of the pitavastatin C7 side chain via a Wittig reaction between phosphonium salt 2 and the enantiomerically pure C6-formyl side chain 3. The 1,3-syn-diol acetal motif in 3 was established with excellent stereo
描述了从商业上可获得的(S)-表氯醇开始的匹伐他汀钙(1)的有效,简明的不对称合成。会聚Ç 1条+ C 6路线允许的组件中的匹伐他汀的C 7侧链经由鏻盐之间的维悌希反应2和对映体纯Ç 6 -甲酰基侧链3。1,3-顺式在二醇缩醛基序3是由非对映选择性铋促进的双组分半缩醛/氧杂迈克尔加成反应具有优良的立体声控制建立(小号)-α,β-不饱和酮4与乙醛