An efficient route to synthesize cycloalkyl substituted purine nucleosides was developed. This metal-free C-H activation was accomplished by tBuOOtBu initiated radical reaction. By adjusting the amount of tBuOOtBu and reaction...
A highly regioselective Minisci reaction with the decarboxylative alkylation of purinenucleosides under mild conditions was developed. With 5 mol % AgNO3 as a catalyst and (NH4)2S2O8 as an oxidant, a series of purinenucleosides including ribosyl, deoxyribosyl, arabinosyl purinenucleosides worked well with primary, secondary, and tertiary aliphatic carboxylic acids.
开发了在温和条件下具有嘌呤核苷脱羧烷基化的高度区域选择性Minisci反应。以5 mol%的AgNO 3为催化剂,以(NH 4)2 S 2 O 8为氧化剂,一系列嘌呤核苷,包括核糖基,脱氧核糖基,阿拉伯糖基嘌呤核苷,与伯,仲和叔脂肪族羧酸配合得很好。
Light, metal‐free regioselective<scp>C<sup>6</sup>‐H</scp>alkylation of purines and purine nucleosides with alcohols
A metal-, light-free radical alkylation reaction of purines and nucleosides has been achieved with readily available alcohols (1°, 2°, 3°) as the alkyl radical sources enabled by oxalates, which does not need any catalysts, N2 protection, and protecting groups. Although there are three potential active C(sp2)H bonds and four interferential nitrogen atoms in the purine motif, the reaction still shows
以草酸盐为烷基自由基源,以易得的醇(1°、2°、3°)实现了嘌呤和核苷的金属、光自由基烷基化反应,不需要任何催化剂、N 2保护和保护基团。尽管嘌呤基序中存在3个潜在的活性C( sp 2 ) H键和4个干扰氮原子,但该反应在C 6 H位上仍然表现出优异的区域选择性,并且不存在多烷基化问题。此外,该方法表现出广泛的功能组耐受性,并且可扩展至克级,可应用于后期 C 嘌呤的 H 烷基化合成具有抗 CEM 活性的 6-环戊基星云碱,从而证明了其实用性。
Regio-controlled radical substitution of 9-substituted purines
作者:Laurent Désaubry、Jean-Jacques Bourguignon
DOI:10.1016/0040-4039(95)01647-z
日期:1995.10
9-benzylpurine undergoes facile radical alkylation and acylation under standard Minisci's conditions affording regioselectively 6-substituted derivatives.