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)