Carbene-Catalyzed [4 + 2] Cycloadditions of Vinyl Enolate and (in Situ Generated) Imines for Enantioselective Synthesis of Quaternary α-Amino Phosphonates
作者:Jun Sun、Chengli Mou、Zhongyao Wang、Fangcheng He、Jian Wu、Yonggui Robin Chi
DOI:10.1021/acs.orglett.8b02707
日期:2018.9.21
A carbene-catalyzed enantioselective addition of enals to five-membered cyclic imines is developed. The reaction gives chiral quaternary α-amino phosphonates bearing tetrasubstituted carbon centers with excellent enantioselectivities. The imine substrates can be generated in situ from the corresponding amines under an oxidative condition that is compatible with the carbene catalysis. Thus, a one-pot
开发了烯类向五元环状亚胺的卡宾催化对映体选择性加成反应。该反应得到具有优异对映选择性的带有四取代碳中心的手性季α-氨基膦酸酯。亚胺底物可以在与卡宾催化相容的氧化条件下由相应的胺原位产生。因此,在保留高对映选择性的情况下,也实现了烯醛和胺之间的一锅法交叉脱氢偶联(CDC)反应。该方法提供了对氨基膦酸酯的快速对映选择性途径,在药物和农药中具有潜在的应用前景。