An approach to branched-chain amino sugars, particularly derivatives of l-vancosamine (3-amino-2,3,6-trideoxy-3-C-methyl-l-lyxo-hexose) and its d enantiomer, via the cyanohydrin route
作者:John S. Brimacombe、Annalee S. Mengech、Khandker M.M. Rahman、Leslie C.N. Tucker
DOI:10.1016/0008-6215(82)84003-2
日期:1982.12
procedures into methyl 3-acetamido-2,3,6-trideoxy-3- C -methyl-α- d - arabino -hexopyranoside, which was transformed into methyl N -acetyl-α- d -vancosaminide on inversion of the configuration at C-4. A related approach employing methyl 2,6-dideoxy-4- O -methoxymethyl-α- l - erythro -hexopyranosid-3-ulose gave the kinetic cyanohydrin and thence, via the spiro-aziridine 27 , methyl 3-acetamido-2,3,6-trideoxy-3-
摘要在平衡条件下,将4,6- O-亚苄基-2-脱氧-α-d-赤-己吡喃糖苷-3- ulose与氰化钾反应,首先得到4,6- O-亚苄基-3-C-甲基。氰基-2-脱氧-α-d-核糖-己吡喃糖苷(7),由于它缓慢还原为热力学稳定的d-阿拉伯糖异构体,可以直接从反应混合物中结晶出来。可以通过公开的方法将衍生自动力学产物7的甲磺酸酯转化为甲基3-乙酰氨基-2,3,6-三苯氧基-3-C-甲基-α-d-阿拉伯糖-己吡喃糖苷,然后将其转化为甲基N-乙酰基-α-d -vancosaminide在C-4处的构型反转。使用甲基2,6-二脱氧-4-O-甲氧基甲基-α-1-赤藓-己吡喃糖苷-3-ulose的相关方法给出了动力学氰醇,因此,通过螺-氮丙啶27,