Azines and Azoles: CXXII. New Regioselective Synthesis of 1-Substituted 6-Alkyluracils
作者:V. N. Yuskovets、A. V. Moskvin、L. E. Mikhailov、B. A. Ivin
DOI:10.1007/s11176-005-0185-2
日期:2005.1
Readily available 5-acyl-4-hydroxy-3,6-dihydro-2H-1,3-thiazine-2,6-diones with primary alkyl- and arylamines in mild conditions (boiling in propan-2-ol) to give Schiff bases. In more rigid conditions (boiling in DMF), the reaction is accompanied by COS liberation and provides 1-substituted 6-alkyluracils. This previously unknown reaction possesses a considerable synthetic potential and can be considered as a new, general, and regioselective synthetic approach to 1-substituted 6-alkyluracils.
现成的 5-酰基-4-羟基-3,6-二氢-2H-1,3-噻嗪-2,6-二酮与伯烷基和芳基胺在温和条件下(在丙-2-醇中沸腾)反应生成希夫碱。在更严格的条件下(在 DMF 中沸腾),反应伴随着 COS 的释放,生成 1-取代的 6-烷基尿嘧啶。这一之前未知的反应具有相当大的合成潜力,可被视为 1-取代的 6-烷基尿嘧啶的一种新的、通用和区域选择性合成方法。