Synthesis and spectral properties of diethyl organylchalcogenoalkyl(alkyl)malonates, RX(CH2)nCR′(COOC2H5)2, and 5-alkyl-5-(organylchalcogenoalkyl)barbiturates, RX(CH2)nO (X = Se, Te)
作者:Robert A. Grigsby、Kurt J. Irgolic、Furn F. Knapp
DOI:10.1016/0022-328x(83)87161-7
日期:1983.12
Barbiturates substituted at the 5-position with organyltelluroalkyl or organylselenoalkyl groups were prepared by ring annulation of appropriately substituted diethyl malonates with urea or thiourea. The substituted diethyl malonates [phenyl-tellurobutyl(ethyl), i-propyltelluropropyl(ethyl), i-propyltelluropropyl(allyl), i-propylselenopropyl(ethyl), and phenylselenohexyl(methyl) were prepared in 55–91%
通过用尿素或硫脲环环取代适当取代的丙二酸二乙酯来制备在5-位被有机基碲烷基或有机基硒代烷基取代的巴比妥酸酯。丙二酸二乙酯的取代基[苯基-碲基丁基(乙基),异丙基-碲基丙基(乙基),异丙基-碲基丙基(烯丙基),异丙基硒代丙基(乙基)和苯基硒基己基(甲基)通过二乙基反应制备,产率为55-91%在乙醇/苯中,ω-溴烷基(烷基)丙二酸酯与有机碲灵酸酯或-硒酸酯(RXNa; XSe,Te)。通过NaBH 4还原二碲化物(R 2 Te 2)或二硒化物(R 2 Se 2)在乙醇/苯中。ω-溴代烷基(烷基)丙二酸酯是通过使丙二酸(烷基)与α,ω-二溴代烷烃反应而制得的。在叔丁醇钾存在下,二甲基有机基硫代烷基烷基(烷基)丙二酸酯与过量的脲或硫脲在二甲亚砜中的缩合得到5-有机基硫代烷基-5-烷基巴比妥酸酯或-硫代巴比妥酸酯。得到以下巴比妥酸盐,产率为28-84%:苯基碲丁基(乙基),熔点100°C;异丙基碲丙基(乙基),mp