Stereocontrolled Synthesis of<i>anti</i>-α-Hydroxy-β-Amino and<i>anti</i>-α,β-Diamino Acid Derivatives by Epoxidation of 1-Arylthio-1-nitroalkenes
作者:Richard F. W. Jackson、Lydia Ambroise、Estelle Dumez、Andrea Szeki
DOI:10.1055/s-2002-34851
日期:——
Epoxidation of 1-tolylthio-1-nitroalkenes containing an allylic Boc-protected amino group yields cis-oxazolidinones 13, formed by intramolecular trapping of the presumed intermediate epoxides by the carbamate group. Epoxidation of the analogous Z- or Fmoc-protected derivatives yields the corresponding syn-epoxides which, although they cannot be isolated, can be trapped with aqueous ammonia, or more efficiently benzylamine, to give stereoisomerically pure anti-α,β-diamino acid derivatives.
含有烯丙基叔丁氧羰基保护氨基的 1-甲苯硫基-1-硝基烯烃发生环氧化反应,生成顺式噁唑烷酮 13,这是假定的中间环氧化物被氨基甲酸酯基团分子内捕获而形成的。类似的 Z- 或 Fmoc 保护衍生物的环氧化反应会产生相应的合成环氧化物,虽然这些合成环氧化物无法分离,但可以用水性氨或更有效的苄胺进行捕获,从而得到立体异构纯的反δ,δ²-二氨基酸衍生物。