Synthesis of Enantiopure Amino Polyols and Pyrrolidine Derivatives from 5-Bromo-1,2-oxazin-4-ones
作者:Hans-Ulrich Reissig、Robert Pulz、Wolfgang Schade
DOI:10.1055/s-2003-37121
日期:——
Diastereoselective electrophilic bromination of 3,6-dihydro-2H-1,2-oxazines syn-1 and anti-1 led to 5-bromo-1,2-oxazin-4-ones 2a and 3a, respectively. Reduction furnished 1,2-oxazin-4-ones 4 and 6 which could be transformed into enantiopure amino and imino sugar derivatives. Nucleophilic substitution of the bromo functionality gave amino substituted 1,2-oxazines 10. They were converted into diamino substituted sugar derivatives.
对 3,6-二氢-2H-1,2-恶嗪 syn-1 和 anti-1 进行非对映选择性亲电溴化反应后,分别得到 5-溴-1,2-恶嗪-4-酮 2a 和 3a。 还原生成的 1,2-恶嗪-4-酮 4 和 6 可转化为不对映纯的氨基和亚氨基糖衍生物。溴官能团的亲核取代反应产生了氨基取代的 1,2-噁嗪 10。它们被转化为二氨基取代的糖衍生物。