The photochemical reactions of α,β,γ,δ -unsaturated diazo compounds at low temperature
作者:Ian R. Robertson、John T Sharp
DOI:10.1016/s0040-4020(01)82435-2
日期:1984.1
The α,β:γ,δ-unsaturated tosylhydrazone lithium salts (4) undergo photolysis at −60°C to give vinylcyclopropenes (10) and [l,2]diazeto[l,4-a] pyrroles (11) and/or (12). The formation of (11, X=H) establishes the intermediacy of (8, X=H) in the formation of the 3-1,2-diazepine (9). The diazoalkene (5, X=Me) showed opposite electrocyclisation periselectivity to its thermal cyclisation and gave (11, X=Me)
α,β:γ,δ不饱和甲苯磺酸hydr锂盐(4)在-60°C下进行光解,得到乙烯基环丙烯(10)和[l,2]二氮杂[1,4-a]吡咯(11)和/或(12)。(11,X = H)的形成在3--1,2-二氮杂dia(9)的形成中建立了(8,X = H)的中间体。重氮烯烃(5,X = Me)显示出与其热环化相反的电环化选择性,得到(11,X = Me)(8,X = Me),而不是吡唑(2)和(3)。