An efficientsynthesis of racemic and both enantiomeric forms of heteroaryl substituted γ- and δ-lactone derivatives derived fromallyl and homoallylalcohol backbones has been accomplished via ring closing metathesis reaction. 2-Heteroaryl substituted allyl and homoallylalcohols have been efficiently resolved through enzymatic method with high ee (97–99%) and known stereochemistry. Antimicrobial
Zn-ProPhenol Catalyzed Enantio- and Diastereoselective Direct Vinylogous Mannich Reactions between α,β- and β,γ-Butenolides and Aldimines
作者:Barry M. Trost、Elumalai Gnanamani、Jacob S. Tracy、Christopher A. Kalnmals
DOI:10.1021/jacs.7b11361
日期:2017.12.20
We report a Zn-ProPhenol catalyzedreaction between butenolides and imines to obtain tetrasubstituted vinylogous Mannich products in good yield and diastereoselectivity with excellent enantioselectivity (97 to >99.5% ee). Notably, both α,β- and β,γ-butenolides can be utilized as nucleophiles in this transformation. The imine partner bears the synthetically versatile N-Cbz group, avoiding the use of