An Efficient Preparation of Isosteric Phosphonate Analogues of Sphingolipids by Opening of Oxirane and Cyclic Sulfamidate Intermediates with α-Lithiated Alkylphosphonic Esters
作者:Chaode Sun、Robert Bittman
DOI:10.1021/jo0487404
日期:2004.10.1
group was introduced via regioselective ring-opening reactions of oxirane 12 and cyclic sulfamidate 22 with lithium dialkyl methylphosphonate, affording 13 and 23, respectively. The synthesis of 1 was completed by SN2 displacement of chloromesylate intermediate 14b with azide ion, followed by conversion of the resulting azido group to a NHBoc group and deprotection. The synthesis of 2 was completed by
d -赤- (2小号,3 - [R,4 ê)-Sphingosine -1-膦酸酯(1),天然存在的鞘氨醇-1-磷酸(等排膦酸酯类似物1A)和d -核糖-phytosphingosine -1-膦酸酯(2),的电子等排膦酸酯类似物d -核糖-phytosphingosine -1-磷酸(2A),合成开始用甲基2,3- ö异亚丙基d -glycerate(4)和d -核糖-phytosphingosine(3), 分别。从4开始的8个步骤中形成了环氧乙烷12,从3开始的5个步骤中形成了环状氨基磺酸酯22。通过环氧乙烷12和环状氨基磺酸酯22与二烷基甲基膦酸锂的区域选择性开环反应引入膦酸酯基,分别得到13和23。1的合成通过用叠氮化物离子用S N 2置换氯甲磺酸酯中间体14b,然后将所得的叠氮基团转化为NHBoc基团并脱保护而完成。合成2通过切割缩醛,N-苄基和烷基膦酸酯基团完成。