Asymmetric Synthesis of 2,3,4-Trisubstituted Functionalised Tetrahydrofurans via an Organocatalytic Michael Addition as Key Step
作者:Dieter Enders、Chuan Wang、Andreas Greb
DOI:10.1002/adsc.200900879
日期:——
The organocatalytic Michael addition of various aldehydes to (2E,4E)‐ethyl 5‐nitropenta‐2,4‐dienoate has been achieved under the catalysis of diphenylprolinol trimethylsilyl ether furnishing the products in good to excellent yields (61–94%) and high stereoselectivities (dr up to >98:2, ee=97 to >99%). Starting from these Michael adducts, 2,3,4‐trisubstituted functionalized tetrahydrofurans are available
在二苯基脯氨醇三甲基甲硅烷基醚的催化下,已经实现了将各种醛有机催化迈克尔加成到(2 E,4 E)-乙基5-硝基戊-2-2,4-二烯酸酯中,从而提供了良好的产率(61-94%)和高立体选择性(dr高达> 98:2,ee = 97至> 99%)。从这些迈克尔加合物开始,可通过以下两个步骤获得2,3,4-三取代的官能化四氢呋喃:还原醛,然后分子内添加氧杂-迈克尔,收率好(54-76%)和立体选择性(DR最高> 95 :5,ee = 97至> 99%)。