CC Cross‐Coupling Reactions of<i>O</i><sup>6</sup>‐Alkyl‐2‐Haloinosine Derivatives and a One‐Pot Cross‐Coupling/<i>O</i><sup>6</sup>‐Deprotection Procedure
作者:Venkateshwarlu Gurram、Narender Pottabathini、Ramesh Garlapati、Avinash B. Chaudhary、Balaram Patro、Mahesh K. Lakshman
DOI:10.1002/asia.201200093
日期:2012.8
CC cross‐coupling and O6‐deprotection could be accomplished in a single step. Thus, inosine 2‐chloro‐O6‐allylinosine was chosen as the substrate and, after re‐evaluation of the cross‐coupling conditions with 2‐chloro‐O6‐methylinosine as a model substrate, one‐step CC cross‐coupling/deprotection reactions were performed with the O6‐allyl analogue. These reactions are the first such examples of a one‐pot
研究了O 6 -烷基-2-溴-和2-氯肌苷衍生物与芳基-、杂芳基-和烷基硼酸的C C交叉偶联反应条件。使用甲硅烷基保护的 2-溴-O 6-甲基肌苷进行优化实验,确定 [PdCl 2 (dcpf)]/K 3 PO 4在 1,4-二恶烷中是这些反应的最佳条件 (dcpf=1,1 '-双(二环己基膦)二茂铁)。尝试O 6 去甲基化以及用胺取代 C-6 甲氧基均不成功,这导致考虑 Pd 可裂解基团,例如 C C 交叉偶联和O6-脱保护可以一步完成。因此,选择肌苷 2-氯-O 6 -烯丙基肌苷作为底物,并在以 2-氯-O 6 -甲基肌苷为模型底物重新评估交叉偶联条件后,一步 C C 交叉-用O 6 -烯丙基类似物进行偶联/去保护反应。这些反应是在 C C 交叉偶联条件下对嘌呤核苷进行修饰和脱保护的单锅程序的第一个例子。