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
Synthesis of 1-(2-benzofurancarbonyl)azulenes using 1-(bromoacetyl)azulenes as new building blocks
作者:Satoko Yamashiro、Kimiaki Imafuku
DOI:10.1002/jhet.5570390411
日期:2002.7
afford 1-acetyl-3-bromoazulene (3) and 3-bromo-1-(bromoacetyl)azulene (4). In a similar manner, 3-methyl-, 3-ethyl-, 3-propyl-, and 3-methoxycarbonyl-substituted 1-acetylazulenes 2a-d gave the corresponding 3-substituted 1-(bromoacetyl)azulenes 5a-d as major products and 1-(dibromoacetyl)azulenes 6a-d as minor ones. The 1-(bromoacetyl)azulenes 5a-d are useful as new building blocks. Compounds 5a-d reacted