Total synthesis of 2' -deoxytoyocamycin, 2'-deoxysangivamycin and related 7-β--arabinofuranosylpyrrolo[2,3-]pyrimidines ring closure of pyrrole precursors prepared by the stereospecific sodium salt glycosylation procedure
作者:Kandasamy Ramasamy、Roland K. Robins、Ganapathi R. Revankar
DOI:10.1016/s0040-4020(01)96068-5
日期:1986.1
total synthesis of 2'-deoxytoyocamycin () and 2'-deoxysangivamycin (). Similar glycosylation of the sodium salt of with 1-chloro-2,3,5-tri--benzyl-α--arabinofuranose () furnished the corresponding blocked nucleoside (), which on ring closure, debromination/debenzylation gave 4-amino-7-β--arabinofuranosylpyrrolo[2,3-]pyrimidine-5-carboxamide (). The synthetic utility of this glycosylation procedure for
首次完成了完全芳香的吡咯,2-溴-(或乙硫基)-5-乙氧基亚甲基氨基-吡咯-3、4-二碳腈(和)的立体有择的高产糖基化反应。用1-氯-2-脱氧-3.5-二-甲苯甲酰基-α--赤型五呋喃糖()或用其处理的钠盐仅产生相应的具有β-端基异构构型(和)的封闭核苷,其在环上闭合和进一步的官能团转化提供了2'-脱氧代霉素()和2'-脱氧桑格霉素()的总合成。1-氯-2,3,5-三-苄基-α-呋喃糖的钠盐的类似糖基化作用()提供相应的封闭核苷(),其在闭环时脱溴/去苄基化,得到4-氨基-7-β-阿拉伯呋喃糖基吡咯并[2,3- ]嘧啶-5-甲酰胺()。已证明该糖基化方法可用于其他饱和吡咯,吡咯-3-甲腈()和3,4-吡咯二羧酸二乙酯()的合成实用性。