作者:Baldev Singh、George Y. Lesher、Ruth P. Brundage
DOI:10.1055/s-1991-26604
日期:——
Reaction of 3-aminocrotononitrile (2) with methyl methacrylate (3) and methyl 2-propynolate (9) led to the formation of 1,4,5, 6-tetrahydro-2,5-dimethyl-6-oxo-3-pyridinecarbonitrile (4) and 1, 6-dihydro-2-methyl-6-oxo-3-pyridinecarbonitrile (10), respectively. Condensation of 4 with Bredereck's reagent [bis(dimethylamino)-tert-butoxymethane], and that of 6-methoxy-2-methyl-3-pyridinecarbonitrile (12) with N,N-dimethylacetamide dimethyl acetal gave the corresponding enamines 5 and 13 which in turn were cyclized with hydrogen bromide to bromonaphthyridinones 6 and 14, respectively. Debromination of 6 followed by dehydrogenation gave 3-methyl-1,6-naphthyridin-2(1H)-one (8). Debromination of 14 with catalytic reduction gave 7-methyl-1, 6-naphthyridin-2(1H)-one (15)
3-aminocrotononitrile (2) 与甲基丙烯酸甲酯 (3) 和 2-丙炔酸甲酯 (9) 反应,分别生成 1,4,5,6-四氢-2,5-二甲基-6-氧代-3-吡啶甲腈 (4) 和 1,6-二氢-2-甲基-6-氧代-3-吡啶甲腈 (10)。 4 与 Bredereck 试剂[双(二甲基氨基)-叔丁氧基甲烷]缩合,以及 6-甲氧基-2-甲基-3-吡啶甲腈(12)与 N,N-二甲基乙酰胺二甲基缩醛缩合,得到相应的烯胺 5 和 13,再与溴化氢环化,分别得到溴萘啶酮 6 和 14。6 脱溴后脱氢得到 3-甲基-1,6-萘啶-2(1H)-酮(8)。 14 在催化还原作用下脱溴,得到 7-甲基-1,6-萘啶-2(1H)-酮 (15)