Enantioselective Distal Functionalization of 3-Cyano-4-methylcoumarins through Direct Vinylogous Conjugate Addition to Maleimides
作者:Sanjay Singh、Ravi Saini、Ravi P. Singh
DOI:10.1021/acs.joc.2c02142
日期:——
An unprecedented organocatalyzed asymmetric vinylogousMichael reaction between 3-cyano-4-methylcoumarins and maleimides with an excellent enantiomeric ratio (up to 99.5:0.5) and yield (up to 95%) is reported. This remarkable selectivity is attributed to the hydrogen bonding ability of l-tert-leucine-derived amine thiourea catalyst. The versatility, practical applicability, and scalability are demonstrated