Michael's a square: An easily prepared squaramide catalyst that promotes the highly enantioselective Michael addition reaction of diphenyl phosphite to a range of nitroalkenes is described. This method leads to chiral β-nitro phosphonates, which are precursors to biologically active β-amino phosphonic acids.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 49:1 (30 Nov. 2009): 153-56.