Diastereodivergent Synthesis of α-Chiral Tertiary Azides through Catalytic Asymmetric Michael Addition
作者:Pei-Gang Ding、Xiao-Si Hu、Jin-Sheng Yu、Jian Zhou
DOI:10.1021/acs.orglett.0c03178
日期:2020.11.6
A diastereodivergent synthesis of α-chiral tertiary azides through catalytic enantioselective Michael addition of α-azido indanones to β,γ-unsaturated α-ketoesters is described. The merger of a newly designed bifunctional phosphoramide C4b and hexafluoroisopropanol (HFIP) affords syn-adducts, whereas the use of thiourea C6a provides anti-adducts without the aid of HFIP. Notably, additive HFIP proves
描述了通过将α-叠氮基茚满酮催化对映选择性迈克尔加成到β,γ-不饱和α-酮酸酯上的非对映异构合成α-手性叔叠氮化物。新设计的双功能磷酰胺C4b和六氟异丙醇(HFIP)的合并提供了顺加合物,而硫脲C6a的使用无需HFIP即可提供反加合物。值得注意的是,事实证明,添加剂HFIP是实现非对映选择性逆转的关键控制元素。产物易于转化为对映体富集的螺N-杂环。