Regio- and stereoselective cyclizations of dianhydro sugar alcohols catalyzed by a chiral (salen)CoIII complex
作者:Toshifumi Satoh、Tomoko Imai、Satoshi Umeda、Katsuyuki Tsuda、Hisaho Hashimoto、Toyoji Kakuchi
DOI:10.1016/j.carres.2005.09.003
日期:2005.12
4-di- O -methyl- l -iditol ( 7 ), respectively. The cyclization of 3 and 5 is a novel method for obtaining 1,6-anhydro-3,4-di- O -methyl- d -mannitol ( 11 ) and a stereoselective route to 1,5-anhydro-3- O -methyl- l -arabinitol ( 13 ). It is proposed that the reaction occurs via endo -selective cyclization of an epoxy alcohol produced by the endo -selective ring-opening of one of the two epoxide moieties
摘要(salen)Co III OAc((R,R)-1和(S,S)-1)催化手性二脱水糖1,2:5,6-dianhydro-3,4-di-O的环化反应-甲基-d-葡萄糖醇(2),1,2:5,6-双脱水-3,4-二-O-甲基-d-甘露糖醇(3),1,2:5,6-双脱水-3,4 -二-O-甲基-1-ID醇(4)和1,2:4,5-二脱水-3-O-甲基-1-阿拉伯糖醇(5)是合成脱水醛糖醇的简便方法。使用(R,R)-1和(S,S)-1的2环化非对映选择性地形成2,5-脱水-3,4-二-O-甲基-d-甘露醇(6)和2,5-分别为脱水的3,4-二-O-甲基-1-ID-醇(7)。3和5的环化是获得1,6-脱水-3,4-二-O-甲基-d-甘露糖醇(11)的新方法和对1,5-脱水3-O-甲基的立体选择路线-l-阿拉伯糖醇(13)。