ALBERT, A., J. CHEM. SOC. PERKIN TRANS., 1981, N 8, 2344-2351
作者:ALBERT, A.
DOI:——
日期:——
v-Triazolo[4,5-d]pyrimidines (8-azapurines). Part 24. The 3-alkyl derivatives
作者:Adrien Albert
DOI:10.1039/p19810002344
日期:——
4-Methylamino-1,2,3-triazole-5-carboxamide (2e) and its 3-benzyl derivative (2b) were cyclized with hydrochloric acid and triethyl orthoformate to give 3-methyl-8-azapurin-6(1H)-one (1c) and its 9-benzyl derivative (1b). The reaction mechanism is discussed. The 8-azapurinone (1c) was converted by phosphorus pentasulphide into 3-methyl-8-azapurine-6(1H)-thione (9) and an extraordinary by-product, 5-amino-1