1,2-bis(phenylsulfonyl)alkenes as versatile groups in organic synthesis: The preparation of alkyl- and aryl-substituted norbornadienes via the Diels-Alder cycloaddition - Grignard reaction - desulfonylation sequence
作者:Ugo Azzena、Sergio Cossu、Ottorino De Lucchi、Giovanni Melloni
DOI:10.1016/s0040-4039(00)99595-9
日期:——
A syntheticmethodology for the preparation of the formal Diels-Alder cycloadducts of alkyl- and aryl-substituted acetylenes which exemplifies the utility of bis(phenylsulfonyl)alkenes 1 in organic synthesis is presented. The procedure entails [4+2]-cycloaddition of (E)-1,2-bis(phenylsulfonyl)-1-chloroethylene (4), Grignard reaction and desulfonylation; each step occurs in high yield.