The synthesis of ethyl 2-[(2,2-dibenzoyl)ethenyl]amino-3-dimethyl-aminopropenoate and its application to the synthesis of fused 3-aminopyran-2-ones and 3-aminoazolo- and -azinopyrimidin-4(4<i>H</i>)-ones
作者:Gorazd Soršak、Branko Stanovnik、Simona GoliČ Grdadolnik
DOI:10.1002/jhet.5570350606
日期:1998.11
Ethyl 2-[(2,2-dibenzoyl)ethenyl]amino-3-dimethylaminopropenoate (3) was prepared from dibenzoylmethane (1) in two steps, and used as a reagent for preparation of fused substituted 3-aminopyranones 12–15 in over 90% yield, quinolizin-4-one 16 in over 79% yield, and fused pyrimidin-4-ones 17–19 in 40–50% yield. Deprotection of (2,2-dibenzoyl)ethenyl group with either diethylamine or hydrazine hydrate
乙基2 - [(2,2-二苯甲酰基)乙烯基]氨基-3- dimethylaminopropenoate(3)由二苯甲酰基甲烷(制备1)在两个步骤中,并且用作用于制备稠合的取代的3- aminopyranones的试剂12-15在经产率为90%,喹啉嗪4酮16的产率超过79%,熔融嘧啶4酮17-19的产率为40-50%。用二乙胺或水合肼对(2,2-二苯甲酰基)乙烯基进行脱保护,分别得到游离氨基化合物20、21和22,产率分别为35%,91%和71%。