Synthesis of 1-(4-thiazolyl)azulenes: Reactions of bromoacetyl-substituted azulenes with thioamides, thioureas, and thiosemicarbazones
作者:Hiromi Takao、Dao-Lin Wang、Shigeru Kikuchi、Kimiaki Imafuku
DOI:10.1002/jhet.5570410512
日期:2004.9
1-(Bromoacetyl)-3-methylazulene (1a) and methyl 3-(bromoacetyl)azulene-1-carboxylate (1b) reacted with thioamides 3a,b and thioureas 3c,d in boiling ethanol to give the corresponding (4-thiazolyl)azulenes 4a-d and 5a-d in good yields, respectively. The reactions of dibromoacetyl-substituted azulene (2) also gave (4-thiazolyl) azulenes 5a-d in lower yields and the azulene 2 was recovered. By heating
1-(溴乙酰基)-3-甲基氮杂烯(1a)和3-(溴乙酰基)氮杂-1-羧酸甲酯(1b)与硫酰胺3a,b和硫脲3c,d在沸腾的乙醇中反应生成相应的(4-噻唑基)天青石4a-d和5a-d分别以良好的产率。二溴乙酰基取代的甘菊环的反应(2)也得到(4-噻唑基)薁图5a-d较低的产率和甘菊环2被回收。通过在100%磷酸中加热化合物5a-d,消除酯基,得到1-(4-噻唑基)azulenes 6a-d。化合物1a,b与硫代半咔唑7a-f反应,通过它们的氢化物以中等至高收率得到[(2-亚烷基肼基肼基)噻唑-4-基] azulenes 8a-f和9a-f。