An efficient ultrasonic-assisted synthesis of the thiazolo[2,3-b] quinazoline and thiazolo[3,2-a] pyrimidine derivatives
作者:Ali Darehkordi、Jabber Reentan、Mahin Ramezani
DOI:10.1007/s13738-012-0169-1
日期:2013.6
with aromatic aldehyde (1) and thiourea (3) in the presence of modified montmorinollite nanostructure or HCl as a catalyst under heating and solvent-free conditions produced 7-benzylidene-4-aryl-3,4,6,7-tetrahydro-1H cyclopenta[d]pyrimidine-2(5H)-thione or 8-benzylidene-4-aryl-3,4,5,6,7,8 hexahydroquinazoline-2(1H)-thione (4). Compound 4 was utilized as a key intermediate for the synthesis of new thiazolo[2
摘要在改性的蒙脱石纳米结构或盐酸作为催化剂的情况下,在加热和无溶剂条件下,用芳族醛(1)和硫脲(3)处理环己酮或环戊酮(2),生成7-苄叉基-4-芳基-3,4 ,6,7-四氢-1 H环戊[ d ]嘧啶-2(5 H)-硫酮或8-亚苄基-4-芳基-3,4,5,6,7,8六氢喹唑啉-2(1 H)-硫酮(4)。化合物4被用作合成新的噻唑并[2,3- b ]喹唑啉和噻唑并[3,2- a ]嘧啶衍生物的关键中间体(5a –5o)通过两种不同的方法通过与二乙基二甲基乙炔基二甲酸二甲酯和乙炔二甲酸二甲酯的反应:(a)在环境温度下在超声辐射下以甲醇为溶剂;(b)在室温下于甲醇中作溶剂(常规磁力搅拌)。超声辅助合成在室温下短的反应时间(30-50分钟)内可提供出色的产率(87-95%)。通过UV-Vis,IR和NMR光谱和元素分析对新合成化合物的化学结构进行了表征。