An unexpected cyclization discovered during the synthesis of 8-substituted purines from a 4,5-diaminopyrimidine
作者:Qun Dang、Robert M. Rydzewski、Daniel K. Cashion、Mark D. Erion
DOI:10.1016/j.tetlet.2008.01.095
日期:2008.3
(2) to 6-chloro-8-[1-(3-bromo)propyl]-9-phenethylpurine (1) under standard cyclization conditions did not give the targeted product. Instead, an unexpected cyclization occurred to give 6-chloro-5-[1-(3-hydroxy)propyl]-9-phenethylpurine (3), which can be viewed as a hydrolysis product of the resulting halide. The cyclization reaction was optimized and compound 3 was prepared in excellent yield. A mechanism