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。