Methyl 4,6-di-O-p-toluenesulfonyl-α-D-threo-hex-2-enopyranoside 4b reacts with methylamine at room temperature to displace the allylic sulfonate only, and the ethyl urethane of the resulting 4-N-methylamino sugar is cyclized with iodonium ion to give the 2-iodo-oxazolidinone, 13. This substance, upon treatment with sodium iodide in acetone, gives the 2,6-diiodide 14a. Deiodination, followed by base hydrolysis, gives the cis-hydroxyamino precursor, which upon N-acetylation and O-methylation affords the previously known holacosaminide 1b.
甲基4,6-二-O-p-
甲苯磺酰基-α-D-左-己-2-烯基
吡喃苷4b在室温下与
甲胺反应,只置换烯
丙基磺酸酯,所得的4-N-甲基
氨基糖的乙基
脲醚与
碘离子环化形成2-
碘-
噁唑烷酮13。该物质经过在
丙酮中与
碘化钠处理后,得到2,6-二
碘代14a。去
碘化后,经碱
水解得到顺式-
羟胺前体,经N-乙酰化和O-甲基化后得到已知的holacosaminide 1b。