Diastereoselective α-Hydroxylation of N-tert-Butanesulfinyl Imidates and N′-tert-Butanesulfinyl Amidines with Molecular Oxygen
2018
Diastereoselective α-hydroxylation using molecular oxygen has been achieved with chiral α-alkyl N-tert-butanesulfinyl imidates and α-aryl N′-tert-butanesulfinyl amidines. The aza-enolates generated from deprotonation of imidates/amidines can be intercepted by O2 with excellent diastereocontrol and subsequently transformed into α-hydroxylation products in the presence of the reductant trimethyl phosphite.
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