Enantioselective hydrophosphonylation ofN-Boc imines using chiral guanidine-thiourea catalysts

The enantioselective hydrophosphonylation ofN-Boc imines was investigated using a new family of pseudo-symmetric guanidine-thiourea catalysts, providing α-amino phosphonates in moderate to high yields with good enantioselectivity. The catalyst was heterogenized by polymerization with styrene and the resulting catalyst was applied to reactions under continuous-flow conditions. ? The Royal Society of Chemistry 2021.