Highly Efficient and Broad-Scope Protocol for the Preparation of 7-Substituted 6-Halopurines via N9-Boc-Protected 7,8-Dihydropurines
作者:Dalimil Dvořák、Vladislav Kotek、Tomáš Tobrman
DOI:10.1055/s-0031-1290068
日期:2012.2
9-Boc-6-chloropurine, which can be obtained in high yield, is nearly quantitatively reduced with the THFËBH3 complex. The obtained 9-Boc-7,8-dihydropurine derivative is more stable compared to the corresponding 9-tritylpurine and can be smoothly N7-alkylated, acylated, or it can serve as an N-nucleophile in conjugate additions. Deprotection with trifluoroacetic acid followed by MnO2 oxidation affords the N7-substituted purines in high yields. The whole sequence of alkylation, deprotection, and oxidation can be done with crude intermediates using chromatography only for the purification of the final N7-substituted purine.
高产率可获得的9-Boc-6-氯嘌呤几乎可以定量地被THF-BH3复合物还原。所得到的9-Boc-7,8-二氢嘌呤衍生物相比于相应的9-三苯甲基嘌呤更加稳定,并且可以顺利地进行N7-烷基化、酰基化或作为N-亲核试剂参与共轭加成。使用三氟乙酸脱保护后,再经MnO2氧化,可获得高产率的N7-取代嘌呤。整个烷基化、脱保护和氧化的序列可以在使用色谱法仅对最终的N7-取代嘌呤进行纯化的条件下,利用粗中间体完成。