Diastereoselective Synthesis of β-Heteroaryl <i>syn</i>-α-Methyl-β-Amino Acid Derivatives via a Double Chiral Auxiliary Approach
作者:Jianwei Bian、David Blakemore、Joseph S. Warmus、Jianmin Sun、Matthew Corbett、Colin R. Rose、Bruce M. Bechle
DOI:10.1021/ol3033785
日期:2013.2.1
The addition of the SuperQuat enolate to five- and six-membered heterocyclic tert-butyl sulfinimines led to a high syn-selectivity of up to 99:1 in good to excellent yields. The reaction Is tentatively proposed to proceed through an open-chain transition state with the presence of an alpha-heteroatom on the sulfinimine leading to high diastereoselectivities. The adducts were derivatized to beta-amino esters and amides in a facile manner.
Vereinfachter Zugang zu 5-unsubstituierten 4H-1,2,4-Triazol-3-carbaldehyden