Highly Stereoselective Metal-Free Hydrogenations of Pyrrolo[1,2-<i>a</i>]quinoxalines
作者:Xiaoqin Liu、Ting Liu、Wei Meng、Haifeng Du
DOI:10.1021/acs.orglett.8b02364
日期:2018.9.21
A metal-free hydrogenation of pyrrolo[1,2-a]quinoxalines has been successfully realized by using the combination of B(C6F5)3 and tris(4-methoxyphenyl)phosphine to furnish the corresponding 1,2,3,3a,4,5-hexahydropyrrolo[1,2-a]quinoxalines in 59–99% yields. For 4-aryl-substituted pyrrolo[1,2-a]quinoxalines, high cis selectivities were obtained, but trans-selectivities were achieved for the 4-methyl-substituted
通过结合使用B(C 6 F 5)3和三(4-甲氧基苯基)膦来提供相应的1,2,3,成功地实现了吡咯并[1,2- a ]喹喔啉的无金属加氢, 3a,4,5-六氢吡咯并[1,2- a ]喹喔啉的产率为59-99%。对于4-芳基取代的吡咯并[1,2- a ]喹喔啉,获得了高的顺式选择性,但是对于4-甲基取代的底物却获得了反式选择性。