[EN] A NEW ORGANOCATALYTIC SYNTHESIS OF CHIRAL PYRAZOLIDINES AND THEIR ANALOGUES [FR] NOUVELLE SYNTHÈSE ORGANOCATALYTIQUE DE PYRAZOLIDINES CHIRALES ET DE LEURS ANALOGUES
A tandem reaction of in situ generated a-amino aldehydes with dimethyloxosulfonium methylide under Corey-Chaykovsky reaction conditions proceeds efficiently to give 4-hydroxypyrazolidine derivatives in high yields with excellent enantio- and diastereoselectivities. This organocatalytic sequential method provides for the efficient synthesis of anti-1,2-aminoalcohols, structural subunits present in several bioactive molecules as well.