Radical-mediated cyclization of norephedrine derived alpha-iodoamides 1 was found to be highly stereoselective (greater-than-or-equal-to 97:3) favouring diastereoisomer 2. Transition state modelling with a force field developed ad hoc, nicely predicts the stereochemical results.
Stereoselective radical-mediated cyclization of norephdrine derived α-iodoamides: synthesis of enantiopure pyrrolidines and trandition state modelling1
Radical-mediated cyclization of norephedrine derived α-iodoamides 1 was found to be highly stereoselective (≥97:3) favouring diastereoisomer 2. Bicyclic lactams 2 were transformed in high yields into enantiomerically pure pyrrolidines 10. Transition state modelling with a force developed ad hoc nicely predicts the stereochemical results.