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 organocatalyticMichaeladdition 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