Highly stereoselective directed reactions and an efficient synthesis of azafuranoses from a chiral aziridine
作者:Hogyu Lee、Jun Hee Kim、Won Koo Lee、Jaeheung Cho、Wonwoo Nam、Jaedeok Lee、Hyun-Joon Ha
DOI:10.1039/c3ob27390c
日期:——
natural product (+)-2,5-imino-2,5,6-trideoxy-gulo-heptitol and its C(3)-epimer, were elaborated from a commercially available enantiomerically pure (2R)-hydroxymethylaziridine by highly stereoselective directed reactions in more than 61% overall yield. At first, the nucleophile 2-trimethylsilyloxyfuran was directed to (2R)-aziridine-2-carboxaldehyde by ZnBr2 to yield the unusual anti-addition product
从市场上可买到的对映异构体中精心制备了多羟基化的吡咯烷,例如以天然产物(+)-2,5-亚氨基-2,5,6-三苯氧基-古洛糖醇为代表的生物学上重要的氮杂呋喃糖酶及其C(3)-顶基通过高度立体选择性的定向反应可得到纯净的(2 R)-羟甲基氮丙啶,总收率超过61%。首先,将亲核试剂2-三甲基甲硅烷基氧基呋喃直接用于(2 R)-氮丙啶-2-甲醛ZnBr 2通过螯合控制的转变,以单一异构体的形式产生不寻常的抗加成产物。的开环氮丙啶然后偶联物加成以产生顺式融合自行车,在所需的还原操作后将其转化为靶分子。