A versatile intermediate for the synthesis of 3′-substituted 2′,3′-didehydro-2′,3′-dideoxyadenosine (d4A): preparation of 3′-C-stannyl-d4A via radical-mediated desulfonylative stannylation
作者:Sayoko Onuma、Hiroki Kumamoto、Misono Kawato、Hiromichi Tanaka
DOI:10.1016/s0040-4020(02)00153-9
日期:2002.3
furanosyl]-N6-pivaloyladenine (14): ring opening with NaSPh, oxidation of the 3′-C-phenylthio group, removal of the N6-pivaloyl group, 2′-O-mesylation, elimination of methanesulfonic acid, and tin radical-mediated substitution of the 3′-C-benzenesulfonyl group. The overall yield of this approach was 55% from 14. The synthetic utility of 5′-O-(tert-butyldimethylsilyl)-3′-C-tributylstannyl-d4A (18) thus
描述了一种用于将三丁基锡烷基引入2',3'-二氢-2',3'-二脱氧腺苷(2:d4A)的3'-位的方法。Bu 3 SnOMe与d4A的烷氧基转移以及随后的阴离子O→ C苯乙烯基转移产生3'-C-三丁基锡烷基-d4A(5),但收率低。另一种途径涉及从9- [2,3-脱水-5- O-(叔丁基二甲基甲硅烷基)-β-d-呋喃呋喃糖基] -N 6-吡咯并丙二胺(14)开始的几种反应:用NaSPh开环,氧化3′- C-苯硫基,除去N 6-新戊酰基,2′- O甲磺酸化,消除甲磺酸和锡自由基介导的3'- C-苯磺酰基取代。该方法的总产率为14的55%。5'-的合成效用ø - (叔丁基二甲基)-3'- Ç -tributylstannyl-D4A(18)如此得到的简要地由一些3'-取代的类似物(制备例示19 - 23:I,BR, Ph,乙烯基和苯基乙炔基)。