1,3-Rearrangement of allylic sulphones: Rearrangement-cyclisation of allylic 4-pentenyl sulphones
作者:Eifion D. Phillips、Gordon H. Whitham
DOI:10.1016/s0040-4039(00)60462-8
日期:1993.4
Allylic alkyl sulphones CH2:CHC(Me)2SO2R (RMe, Et, iPr, tBu, CH2SiMe3, CH2CH2SiMe3, and CH2CH(OH)Me underwent 1,3-rearrangement on treatment with benzoyl peroxide in tBuOH. 1,3-Rearrangement did not occur in cases (RCH2Ph, CH2COMe) where the intermediate sulphonyl radical RSO2· could undergo loss of sulphur dioxide to form a resonance-stabilised alkyl radical. Allylic 4-pentenyl sulphones undergo
烯丙基烷基砜CH 2:CHC(Me)2 SO 2 R(RMe,Et,i Pr,t Bu,CH 2 SiMe 3,CH 2 CH 2 SiMe 3和CH 2 CH(OH)Me经过1,治疗3重排与过氧化苯甲酰的tBuOH。1,3-重排没有发生的情况下(RCH 2 PH,CH 2 COME),其中所述中间磺酰基团RSO 2·可能会损失二氧化硫而形成共振稳定的烷基。烯丙基4-戊烯基砜会发生重排,并伴有中间基团的环化作用,如果烯丙基砜在β位置带有吸电子基团,则该过程会更有效。