Synthesis and Some Reactions of Ethyl (2-Alkylimino-1,2-dihydro-1-azaazulen-1-yl)acetates
作者:Noritaka Abe、Yasutaka Fukumoto、Hiroyuki Fujii、Akikazu Kakehi
DOI:10.3987/com-01-s(k)14
日期:——
Ethyl (2-alkylimino-1,2-dihydro-1-azaazulen-1-yl)acetates (3) were synthesized from 2-alkylamino-1-ethoxycarbonylmethyl-1-azaazulenium salts, which were produced from 2-alkylamino-1-azaazulenes with ethyl bromoacetate. Reaction of 3 with acid anhydrides gave the mesoionic anhydro-3-acyl-1-alkyl-2-hydroxy-1,3a-diazacyclopent[a]azulenium hydroxide. Polar cycloaddition of 3 with methyl propiolate gave
(2-烷基亚氨基-1,2-二氢-1-azaazulen-1-yl) 乙酸乙酯 (3) 由 2-烷基氨基-1-乙氧基羰基甲基-1-azaazulenium 盐合成,该盐由 2-烷基氨基-1-制备氮杂唑烯与溴乙酸乙酯。3 与酸酐反应得到中间离子 anhydro-3-acyl-1-alkyl-2-hydroxy-1,3a-diazacyclopent[a]azulenium 氢氧化物。3 与丙炔酸甲酯的极性环加成得到 2-烷基-1-氧代-1,2-二氢-2,9b-二氮杂茚并[3,3a,4,5-bcd]azulene-8-carboxylate 和 3-乙基 5- 2-烷基氨基-2a-氮杂苯并[cd]azulene-3,5-二羧酸甲酯。