Studies on Conjugated Nitriles. VII. Lewis Acid-Promoted Reaction of Active Methylene Compounds with Diethyl Phosphorocyanidate; Preparation of .ALPHA.,.BETA.-Unsaturated .ALPHA.-Aminophosphonates.
作者:Masanori SAKAMOTO、Yasumichi FUKUDA、Taeko KAMIYAMA、Tomomi KAWASAKI
DOI:10.1248/cpb.42.1919
日期:——
Reaction of diethyl phosphorocyanidate (DEPC) with dimethyl malonate (1a) and ethyl cyanoacetate (1b) in the presence of zinc chloride and triethylamine resulted in selective addition of 1a, b to the cyano group of DEPC to give α, β-unsaturated α-aminophosphonates (2a, b). In contrast, similar treatment of enolizable methyl acetoacetate (1c) and acetylacetone (1d) with DEPC gave the corresponding enolphosphates (4c, d) as a result of nucleophilic displacement on the phosphorus atom of DEPC. Conversion of the resulting α-aminophosphonate (2a) to uracil-6-phosphonates (6a, b) was achieved by treatment with phenyl isocyanate (5a) and isothiocyanate (5b), respectively.
在氯化锌和三乙胺存在的情况下,二乙基磷酰氯(DEPC)与丙二酸二甲酯(1a)和氰乙酸乙酯(1b)反应,导致1a、b选择性加成到DEPC的氰基上,生成α、β-不饱和α-氨基膦酸酯(2a、b)。相比之下,对可烯化的甲基乙酰乙酸酯(1c)和乙酰丙酮(1d)进行类似处理,在DEPC的磷原子上发生亲核置换,生成相应的烯醇磷酸酯(4c、d)。通过分别用苯基异氰酸酯(5a)和异硫氰酸酯(5b)处理,将生成的α-氨基膦酸酯(2a)转化为尿嘧啶-6-磷酸酯(6a、b)。