N-Heterocyclic Carbene-Catalyzed Michael Additions of 1,3-Dicarbonyl Compounds
作者:Thomas Boddaert、Yoann Coquerel、Jean Rodriguez
DOI:10.1002/chem.201002538
日期:2011.2.11
A study of the organocatalyticactivity of N‐heterocyclic carbenes (NHCs) in the Michaeladdition of 1,3‐dicarbonyl compounds has allowed us to identify 1,3‐bis(2,6‐diisopropylphenyl)imidazol‐2‐ylidene (IPr) as an excellent catalyst for this transformation (up to 99 % yield with a 2.5 mol % catalyst loading), and the reaction was found to be of broad scope. Two early applications of this unprecedented
The beneficial effect of microwave irradiation versus classical thermal conditions is demonstrated through a series of comparative cross-metathesis reactions.