Formation of carbon-carbon single bonds from isocyanates and cyclic pentaoxyphosphoranes—VI
作者:F. Ramirez、C.D. Telefus、V.A.V. Prasad
DOI:10.1016/0040-4020(75)80188-8
日期:1975.1
4,5-dimethyl-2,2,2-trimethoxy-2,2-dihydro-1,3,2-dioxaphospholene with carbomethoxy, carbopropoxy and N,N-diphenylcarbamyl isocyanates yields, respectively, 2-methoxy-, 2-propoxy- and 2- diphenylamino-5-acetyl-5-methyl-2-oxazolin-4-one. The reaction with carbophenoxy isocyanate gives two products in a proportion which depends on experimental conditions: 2-phenoxy-5-acetyl-5-methyl-2-oxalin-4-one (1:1
4,5-二甲基-2,2,2-三甲氧基-2,2-二氢-1,3,2-二氧杂膦与碳甲氧基,碳丙氧基和N,N-二苯基氨基甲酰基异氰酸酯的反应分别产生2-甲氧基-, 2-丙氧基和2-二苯基氨基-5-乙酰基-5-甲基-2-恶唑啉-4-酮。与异氰酸苯甲氧基酯的反应产生的两种产物的比例取决于实验条件:2-苯氧基-5-乙酰基-5-甲基-2-草酸-4-酮(化学计量比为1:1)和1,3-二苯甲氧基-5 -乙酰基-5-甲基-乙内酰脲(化学计量比1:2)。将2-取代的4-恶唑酮水解为5-乙酰基-5-甲基-恶唑烷-2,4-二酮。2-烷氧基-4-恶唑酮的烷基迁移至相邻的氮,得到3-烷基-5-乙酰基-5-甲基恶唑烷-2,4-二酮。二氧杂磷腈与2-取代的2-噻唑啉4反应,