Pyrimidine Derivatives. VIII. One-Step Synthesis of 3,4-Dihydro-pyrimido(6,1-c)(1,4)oxazine Derivatives by Reactions of 5-Bromo-1-(2-bromoethyl)-6-bromomethyl-2,4(1H,3H)-pyrimidinedione with Sodium Alkoxides and 2-Nitropropane.
作者:Toshio KINOSHITA、Miho UGA、Youko TANIMOTO、Kiyomi OHISHI、Sunao FURUKAWA
DOI:10.1248/cpb.40.2668
日期:——
The reaction of 5-bromo-1-(2-bromoethyl)-6-bromomethyl-3-methyl-2, 4(1H, 3H)-pyrimidinedione (1) with the sodium alkoxide/2-nitropropane system and that of the dinitrate (2) of 5-bromo-1-(2-hydroxyethyl)-6-hydroxymethyl-3-methyl-2, 4(1H, 3H)-pyrimidinedione with sodium alkoxide provide convenient routes to a wide range of 3, 4-dihydro-pyrimido[6, 1-c][1, 4]oxazine derivatives (3) in excellent yields.
5-溴-1-(2-溴乙基)-6-溴甲基-3-甲基-2,4(1H,3H)-嘧啶二酮(1)与醇钠/2-硝基丙烷体系以及5-溴-1-(2-羟乙基)-6-羟甲基-3-甲基-2,4(1H,3H)-嘧啶二酮二硝酸盐(2)与醇钠的反应为一系列3,4-二氢-嘧啶并[6,1-c][1,4]恶嗪衍生物(3)提供了简便的合成途径,且收率极高。