Enantioselective synthesis of functionalized fluorinated dihydropyrano [2,3-c]pyrazoles catalyzed by a simple bifunctional diaminocyclohexane-thiourea
作者:Hong-Fei Zhang、Zheng-Qing Ye、Gang Zhao
DOI:10.1016/j.cclet.2014.01.034
日期:2014.4
Abstract Enantioselectivesynthesis of functionalized fluorinated dihydropyrano[2,3-c]pyrazoles has been achieved via a diaminocyclohexane-thiourea catalyzed cascade Michael addition and Thorpe-Ziegler type cyclization in high yields (up to 98%) with moderate to good enantioselectivity (up to 90% ee ).