The Synthesis of Some New Quinazolone Derivatives of Potential Biological Activity
作者:A. A. El-Barbary、A. Z. Abou El-Ezz、A. M. Sharaf、C. Nielsen
DOI:10.1080/10426500500543834
日期:2006.8.1
The reaction of 5 with ethyl bromobutyrate, chloroacetyl chloride, phenacyl chloride, and phenyl isocyanate yielded compounds 8 , 9 , 11 , and 12 . The coupling of 5 with (2,3,4,6-tetra-O-acetyl-α -D-gluopyranosyl)bromide( ABG ) in DMF at r.t. gave 3-amino-6,8-dibromo-2-(2′,3′,4′,6′-tetra-O-acetyl-β-D-glucopyranosyl)thioxo-2,3-dihydro-1H-quinazolin-4-one ( 14 ). The deblocking of 14 in sodium methoxide
3-氨基-6,8-二溴-2-硫代-2,3-二氢-1H-喹唑啉-4-酮(5)与氯甲酸乙酯和/或氯乙酸乙酯回流得到化合物6和7。5 与溴丁酸乙酯、氯乙酰氯、苯甲酰氯和异氰酸苯酯反应生成化合物 8、9、11 和 12。5与(2,3,4,6-四-O-乙酰基-α-D-吡喃葡萄糖基)溴化物(ABG)在DMF中在室温下偶联得到3-氨基-6,8-二溴-2-(2' ,3',4',6'-四-O-乙酰基-β-D-吡喃葡萄糖基)thioxo-2,3-dihydro-1H-quinazolin-4-one (14)。14 在甲醇钠中的解封得到 5。3-氨基-6,8-二溴-2-甲硫基-3H-喹唑啉-4-酮(16)通过在甲醇中与甲基碘一起搅拌5制备。用水合肼处理16得到4。4 与醛缩合得到 3,5-二溴-2-芳基氨基苯甲酸酰肼 (18a-c)。18a与乙酸酐回流得到3-(亚苄基氨基)-6,8-二溴-2-甲基-3H-喹唑啉-4-酮(19)。腙