A new one-step synthesis of 8-aminopurine nucleoside analogs from 6-(glycosylamino)-5-nitrosopyrimidines
摘要:
The reaction of 6-[[beta-D-(per-O-acetyl)glycopyranosyl]amino]-5-nitrosopyrimidines (1) with POCl3/formamide furnished 8-amino-9-[(per-O-acetyl)glycopyranosyl]purines (2) in good yield. In this reaction formamide seems to play a double role, as the source of the C(8)-amino group of the purine and as the agent responsible for the reduction of the C(5)-nitroso group of the pyrimidine to a hydroxylamino group. A mechanism which reflects this belief is presented. Chemical evidence that supports the mechanism is provided.
A new one-step synthesis of 8-aminopurine nucleoside analogs from 6-(glycosylamino)-5-nitrosopyrimidines
作者:Manuel Melguizo、Manuel Nogueras、Adolfo Sanchez
DOI:10.1021/jo00028a031
日期:1992.1
The reaction of 6-[[beta-D-(per-O-acetyl)glycopyranosyl]amino]-5-nitrosopyrimidines (1) with POCl3/formamide furnished 8-amino-9-[(per-O-acetyl)glycopyranosyl]purines (2) in good yield. In this reaction formamide seems to play a double role, as the source of the C(8)-amino group of the purine and as the agent responsible for the reduction of the C(5)-nitroso group of the pyrimidine to a hydroxylamino group. A mechanism which reflects this belief is presented. Chemical evidence that supports the mechanism is provided.
Novel Procedure for Selective C-Nitrosation of Aminopyrimidine Derivatives Under Neutral Conditions. Scope and Synthetic Applications
作者:Antonio Marchal、Manuel Melguizo、Manuel Nogueras、Adolfo Sánchez、John N. Low
DOI:10.1055/s-2002-19760
日期:——
A novel simple method, based on treatment with isoamyl nitrite (IAN) in DMSO without any added acid, to produce selective C(5)-nitrosation of aminopyrimidine derivatives is described. It proved to be suitable for a multigram scale and applicable to a larger range of pyrimidine derivatives, including amino-dialkoxypyrimidines, than the procedures previously known. Its scope is analyzed and some example on the usefulness of the newly prepared substances as intermediates in the synthesis of fused heterobicyclic derivatives of potential biological interest is presented.