作者:Oliver B. Sutcliffe、Richard C. Storr、Thomas L. Gilchrist、Paul Rafferty
DOI:10.1039/b103250j
日期:——
The transient 1-azafulvenium methides 24, 26 and 28 generated by thermal extrusion of sulfur dioxide from pyrrolo[1,2-c][1,3]thiazole 2,2-dioxide 20 (R = Me), 22 and 23 undergo sigmatropic [1,8]H shifts and the 1-acyl derivatives 30 electrocyclise to give novel pyrrolo[1,2-c][1,3]oxazines 32. The analogous 1,2-diazafulvenium methide 36 has been intercepted in [8π + 2π] cycloadditions with electron-rich
瞬态1- azafulvenium甲基化物24,26和28由热产生的挤压 的 二氧化硫由吡咯并[1,2- c ] [1,3]噻唑2,2-二氧化物20(R = Me),22和23进行σ[1,8] H位移和1-酰基衍生物30的电环化,从而制得新的吡咯并[1,2- c ] [1,3]恶嗪32。在富含电子的甲硅烷基化的[8π+2π]环加成反应中已拦截了类似的1,2-二氮杂富烯酸甲酯36乙炔给出加合物37 – 40。Frontier MO理论部分解释了此行为。