Methyl and Phenylmethyl 2-Acetyl-3-{[2-(dimethylamino)-1-(methoxycarbonyl)ethenyl]amino}prop-2-enoate in the Synthesis of heterocyclic systems: Preparation of 3-amino-4H-pyrido-[1,2-a]pyrimidin-4-ones
作者:Lovro Seli?、Simona Goli? Grdadolnik、Branko Stanovnik
DOI:10.1002/hlca.19970800811
日期:1997.12.15
Methyl 2-acetyl-3-[2-(dimethylamino)-1-(methoxycarbonyl)ethenyl]amino}prop-2-enoate (4) and phenyl-methyl 2-acetyl-3-[2-(dimethylamino)-1(methoxycarbonyl)ethenyl]amino}prop-2-enoate (5) were prepared in three steps from the corresponding acetoacetic esters, and used as reagents for the preparation of N3-protected 3-amino-4H-pyrido[1,2-a]pyrimidin-4-ones 10–12, 5H-thiazolo[3,2-a]pyrimidin-5-one 13
2-乙酰基-3-[[2-(二甲基氨基)-1-(甲氧基羰基)乙烯基]氨基}丙-2-烯酸酯(4)和苯基甲基2-乙酰基-3-[2-(二甲基氨基)-分三步从相应的乙酰乙酸酯制备1(甲氧基羰基)乙烯基]氨基}丙-2-烯酸酯(5),并用作制备N 3保护的3-氨基-4H-吡啶基的试剂[1,2] -一个]嘧啶-4-酮10 - 12,5 ħ -噻唑并[3,2-一个]嘧啶-5-酮13,4 ħ -吡啶并[1,2-一个] -吡啶-4-酮19和2 H -1-苯并吡喃-2-酮20 –23。自由3-氨基-4- ħ -吡啶并[1,2-一个]嘧啶-4-酮24 - 26从制备10 - 12通过除去2-(甲氧基羰基)-3-氧代丁-1-烯基或3-通过各种方法将氧代-2-[((苯基-甲氧基)羰基] but-1-envl作为N-保护基。