Synthesis of 5-Alkyl(aryl)-2-alkylsulfanyl(alkoxy)-4-hydroxy-6H-1,3-oxazin-6-ones
作者:B. Yu. Lalaev、I. P. Yakovlev、V. E. Zakhs
DOI:10.1007/s11176-005-0245-7
日期:2005.3
Alkyl carbamates and S-alkyl thiocarbamates react with substituted malonyl dichlorides in boiling benzene to give the corresponding 2,5-substituted 4-hydroxy-6H-1,3-oxazin-6-ones. The reaction of S-methyl thiocarbamate with unsubstituted malonyl dichloride in boiling diethyl ether or benzene leads to formation of S-methyl (3-methylsulfanylaminocarbonyl-3-oxopropionyl)thiocarbamate and is not accompanied by cyclization, whereas in boiling toluene 4-hydroxy-2-methylsulfanyl-6H-1,3-oxazin-6-one is obtained.
烷基 carbamate 和 S-烷基 thiocarbamate 与取代的马洛尼尔二氯化物在沸腾的苯中反应,生成相应的 2,5-取代的 4-羟基-6H-1,3-氧唑-6-酮。S-甲基 thiocarbamate 与未取代的马洛尼尔二氯化物在沸腾的二乙醚或苯中反应,生成 S-甲基 (3-甲基硫氨基碳酰基-3-氧代丙酰基) thiocarbamate,且不伴随环化;而在沸腾的甲苯中则获得 4-羟基-2-甲基硫基-6H-1,3-氧唑-6-酮。