Direct Catalytic Asymmetric Vinylogous Conjugate Addition of Unsaturated Butyrolactones to α,β-Unsaturated Thioamides
作者:Liang Yin、Hisashi Takada、Shaoquan Lin、Naoya Kumagai、Masakatsu Shibasaki
DOI:10.1002/anie.201402332
日期:2014.5.19
Soft Lewis acid/Brønsted base cooperative catalysts have enabled direct catalytic asymmetric vinylogous conjugate addition of α,β‐ and β,γ‐unsaturated butyrolactones to α,β‐unsaturated thioamides with perfect atom economy. When using α‐angelica lactone and its derivatives as pronucleophiles, as little as 0.5 mol % catalyst loading was sufficient to complete the reaction necessary to construct consecutive
软路易斯酸/布朗斯台德碱协同催化剂已使α,β-和β,γ-不饱和丁内酯直接催化不对称乙烯基共轭加成到α,β-不饱和硫代酰胺中,具有完美的原子经济性。当使用α-当归内酯及其衍生物作为亲核试剂时,低至0.5 mol%的催化剂负载量足以完成以高度非对映和对映选择性的方式构建连续的三和四取代的立体异构中心所必需的反应。