Reactions of 7-methoxyimino-4-methylchromene-2,8-dione with phosphines. Preparation of N-substituted 7-amino-8-hydroxy-4-methyl-2H-[1]-benzopyran-2-ones
作者:Demetrios N. Nicolaides、Raed Wajih Awad、Konstantinos E. Litinas、Elizabeth Malamidou-Xenikaki
DOI:10.1016/0040-4020(96)00923-4
日期:1996.11
7-Methoxyimino-4-methylchromene-2,8-dione 2 reacts with triarylphosphines 1(a-d) to give the unexpected 7-arylamino-8-hydroxy-4-methyl-2H-[1]-benzopyran-2-ones 7(a-d) and methyl diarylphosphinates 8(a-d) in high yields. The reaction of 2 with trialkylphosphines 1(e,f) as well as with diphenylphosphine 15 leads to the formation of the N-dialkylphosphinoyl derivatives 11, 12, 14 and the N-diphenylphosphinoyl