Microwave-assisted synthesis and diels-alder reactions of 1,3-azaphospholo[5,1-a]isoquinolines
作者:Raj K. Bansal、Anshu Dandia、Nidhi Gupta、Dheeraj Jain
DOI:10.1002/hc.10193
日期:——
The application of microwave technique has been extended successfully for the first time to the synthesis of a representative class of azaphospholes, viz. 1,3-bis(alkoxycarbonyl)-1,3-azaphospholo[5,1-a]isoquinolines (2), which occurs rapidly giving higher yields. Stereoselectivity is observed in the reaction with 2,3-dimethyl-1,3-butadiene, and isoprene reacts regioselectively as well. 1-Methyl-3-ethoxycarbonyl-1
微波技术的应用首次成功扩展到具有代表性的氮杂磷化合物的合成,即。1,3-双(烷氧基羰基)-1,3-氮杂磷并[5,1-a]异喹啉(2),发生迅速,产率更高。在与 2,3-二甲基-1,3-丁二烯的反应中观察到立体选择性,异戊二烯也具有区域选择性反应。1-Methyl-3-ethoxycarbonyl-1,3-azaphospholo[1,5-a] 吡啶 (4) 对 [2+4] 环加成保持惰性。半经验 PM3 计算支持在后一种情况下不发生 Diels-Alder 反应。© 2003 Wiley Periodicals, Inc. 杂原子化学 14:560–563, 2003; 在线发表于 Wiley InterScience (www.interscience.wiley.com)。DOI 10.1002/hc.10193