Palladium-Catalyzed Allylic Coupling of 1,2,3-Triazolo[4,5-<i>d</i>]pyrimidines (8-Azapurines)
作者:Michael J. Konkel、Robert Vince
DOI:10.1021/jo960815j
日期:1996.1.1
salt of 7-amino-1,2,3-triazolo[4,5-d]pyrimidine (8-azaadenine, 1) with allylic phosphates or carbonates resulted in mixtures of 2- and 3-substituted 1,2,3-triazolopyrimidines, which were separated by chromatography. 1-Substituted triazolopyrimidines were not isolated from these reactions. Regioselectivity (and stereoselectivity) was also observed for substitution of the allylic moiety when more than
钯催化的7-氨基-1,2,3-三唑并[4,5-d]嘧啶钠盐(8-氮杂腺嘌呤,1)与烯丙基磷酸盐或碳酸盐的偶合反应产生2-和3-的混合物取代的1,2,3-三唑并嘧啶,用色谱法分离。从这些反应中没有分离出1-取代的三唑并嘧啶。当反应中可能有不止一种异构体时,还观察到区域选择性(和立体选择性)对烯丙基部分的取代。使用5-氨基-1,2,3-三唑并[4,5-d]嘧啶-7-酮(8-氮杂鸟嘌呤,2)代替8-氮杂腺嘌呤,也会产生混合物。3-烯丙基-1,2,3-三唑并[4,5-d]嘧啶的交替合成证实了这些化合物的结构。