Asymmetric tandem Mannich-Michael reactions of amino acid ester imines with Danishefsky's diene
摘要:
Imines 1 derived from aromatic, aliphatic, and functionalized aldehydes and various amino acid esters react with Danishefsky's diene under Lewis acid catalysis via a tandem Mannich-Michael mechanism to give cyclic 6-substituted 2,3-didehydro-4-piperidinones in good to high yields and with diastereomeric ratios reaching from 92:8 up to 97:3. The chiral auxiliary is removed by conversion of the alpha-C atom of the amino acid into an acetalic center, employing a Curtius reaction as the key step. For the elucidation of the absolute configuration, the alkaloids (S)-coniine and (R)-delta-coniceine are synthesized from the enaminones 5i and 5r.
Highly Enantioselective Catalytic Addition of Grignard Reagents to N‐Heterocyclic Acceptors
作者:Yafei Guo、Syuzanna R. Harutyunyan
DOI:10.1002/anie.201906237
日期:2019.9.9
greatly sought after because of their significance in medicinal chemistry. Described here is the first general catalytic methodology to access a wide variety of chiral 2‐ and 4‐substituted tetrahydro‐quinolones, dihydro‐4‐pyridones, and piperidones with excellent yields and enantioselectivities, utilizing a single catalyst system.