Catalytic hydrogenation causes C-benzyl bond cleavage in 6-amino-7,7-dibenzyl-2,4-dimethoxy-7H-pyrrolo[3,2-d]pyrimidine: an example indicating novel route to 6-amino-7-benzyl-5H-pyrrolo-[3,2-d]pyrimidines and related compounds
作者:Miroslav Otmar、Milena Masojídková、Miloš Buděšínský、Antonín Holý
DOI:10.1016/s0040-4020(98)83028-7
日期:1998.3
4-dimethoxy-5H-pyrrolo[3,2-d]pyrimidine (8) and 6-amino-7,7-dibenzyl-2,4-dimethoxy-7H-pyrrolo[3,2-d]pyrimidine (10) were prepared by reductive cyclization of the corresponding 6-(1-cyanoalkyl)-5-nitropyrimidines. Catalytic hydrogenation of compound 10 causes a CC bond cleavage between carbon C-7 and one of the geminal benzyl groups. It leads to the formation of 6-amino-7-benzyl-2,4-dimethoxy-5H-pyrrolo[3,2-d]pyrimidine
7-苄基-2,4-二甲氧基-5 H-吡咯并[3,2- d ]嘧啶(8)和6-氨基-7,7-二苄基-2,4-二甲氧基-7 H-吡咯并[3,2 - d ]嘧啶(10)通过相应的6-(1-氰基烷基)的还原性环化制备-5- nitropyrimidines。化合物10的催化加氢导致碳C-7与双苄基苄基之一之间的CC键断裂。其导致形成6-氨基-7-苄基-2,4-二甲氧基-5 H-吡咯并[3,2- d ]嘧啶(12),其被空气自然氧化为6-氨基-7-苄基- 2,4-二甲氧基-7-羟基-7 H-吡咯并[3,2- d]嘧啶(13)。