作者:Ken-ichi Nunami、Kiwamu Hiramatsu、Kimiaki Hayashi、Kazuo Matsumoto
DOI:10.1016/s0040-4020(01)86052-x
日期:1988.1
β-Functionalized α,β-unsaturated amino acids were synthesized by an addition-elimination pathway. Reaction of methyl β-bromo-α-formylaminoacrylates (3a-e), which were prepared by the condensation of methyl isocyanoacetate (1) with aldehydes followed by bromination, with thiols gave β-alkylthio-α, β-unsaturated amino acid derivatives (6a-f). The reaction of (3a) with sodium azide resulted in the formation
通过加成消除途径合成了β-官能化的α,β-不饱和氨基酸。通过将异氰基乙酸甲酯(1)与醛缩合,然后溴化与硫醇反应制得的β-溴-α-甲酰基氨基丙烯酸甲酯(3a-e)反应,得到β-烷硫基-α,β-不饱和氨基酸衍生物( 6a-f)。(3a)与叠氮化钠的反应导致形成2-氧代咪唑啉衍生物(4)。另一方面,通过由(3a和3d),分别用苄醇和苄胺,然后进行酸性水合。