Synthesis of novel heterocyclic fused 1,3-diazabuta-1,3-dienes and accompanying rearrangements in their cycloaddition reactions with ketenes: synthesis of heterocyclic fused pyrimidinone derivatives
作者:S Jayakumar、Parvesh Singh、Mohinder P Mahajan
DOI:10.1016/j.tet.2004.02.023
日期:2004.5
The reactions of 1,3-diazabuta-1,3-dienes 1 with 2-aminothiophenol have been shown to result in excellent yields of N-benzothiazol-2-yl-N′-aryl benzamidines 2. Their regioselective [4+2] cycloadditions with various ketenes are shown to yield novel benzothiazolo pyrimidinones 4. A similar and convenient protocol for the synthesis of bisthiosubstituted 1,3-diazabuta-1,3-dienes 8 and 9 and interesting
1,3- diazabuta-1,3-二烯反应1与2-氨基苯硫酚已经显示出导致优异的产率ñ -苯并噻唑-2-基- Ñ ' -芳基苯甲脒2。他们的区域选择性与各种烯酮的[4 + 2]环加成反应显示出新型的苯并噻唑并嘧啶酮4。描述了合成双硫代取代的1,3-二氮杂丁-1,3-二烯8和9的相似且方便的方案,以及伴随其[4 + 2]环加成与许多烯酮的有趣重排。