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 synthetic methodology 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.
提出了一种制备烷基和芳基取代的乙炔的正式Diels-Alder环加合物的合成方法,该方法例举了双(苯磺酰基)烯烃1在有机合成中的用途。该方法需要(E)-1,2-双(苯磺酰基)-1-氯乙烯(4)的[4 + 2]-环加成,格氏反应和脱磺酰化;每个步骤均以高收率进行。