Organocatalytic enantioselective synthesis of 2,3-dihydropyridazines
作者:Maitane Fernández、Jose L. Vicario、Efraím Reyes、Luisa Carrillo、Dolores Badía
DOI:10.1039/c2cc17370k
日期:——
We have developed an efficient procedure for the easy and straightforward preparation of functionalized dihydropyridazines as highly enantiopure materials by reaction of pyruvaldehyde 2-tosyl hydrazone with a variety of α,β-unsaturated aldehydes using a chiral secondary amine as catalyst. The overall process consists of a cascade reaction involving an initial aza-Michael reaction, in which the stereocentre is installed, followed by an intramolecular aldol reaction/dehydration step.