A metal- and catalyst-free reductive alkylation protocol for the one-pot synthesis of 5-monoalkylbarbiturates from barbituric acids and aldehydes using the in situ generated chemoselective reducing agent 2-phenyl-2,3-dihydrobenzo[ d ]thiazole from 2-aminothiophenol and benzaldehyde is described. The notable advantages of the protocol are operational simplicity, mild reaction conditions, high yield, short reaction time, and simple workup and purification process which make it highly attractive.

中文翻译：

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2-苯基-2,3-二氢苯并[d]噻唑：一种温和、高效、高活性的原位化学选择性还原剂，用于在水中一锅法合成 5-单烷基巴比妥酸盐

使用原位生成的化学选择性还原剂 2-苯基-2,3-二氢苯并[d]噻唑从巴比妥酸和醛一锅合成 5-单烷基巴比妥酸酯的无金属和无催化剂还原烷基化方案并描述了苯甲醛。该协议的显着优点是操作简单、反应条件温和、收率高、反应时间短、后处理和纯化过程简单，使其极具吸引力。