A new conjugated addition of trialkyl phosphites and alkylidenephosphoranes to 3-ω-azideoacetyl coumarin synthesis of some 1,2,3,4-triazaphospholes, triazoles, and azido-coumarin derivatives
作者:Ashraf A. Sediek、Abeer A. Shaddy、Wafaa M. Abdou
DOI:10.1002/jhet.743
日期:2011.11
A new and efficient conjugate addition of trimethyl and triethyl phosphites to 3‐ω‐azidoacetylcoumarin (1) has been studied. The reaction proceeded smoothly at r.t. furnishing 1,2,3,4‐triazaphosphole coumarin derivatives 4a, 4b in ∼75% yields. Linear substituted triazoles 10b, 11a were also obtained from the reactions of 1 with α‐keto ylides, acetyl‐ and benzoylmethylene triphenylphosphoranes. Contrary