1148001-01-7Relevant articles and documents
Asymmetric dimerization of disubstituted ketenes catalyzed by N-heterocyclic carbenes
Lv, Hui,Zhang, Yan-Rong,Huang, Xue-Liang,Ye, Song
, p. 2715 - 2718 (2008)
A series of chiral N-heterocyclic carbenes (NHCs), derived from L-pyrogutamic acid, were found to be efficient catalysts for the asymmetric dimerization of alkylarylketenes to give the corresponding α-quaternary β-alkylidenyl-β-lactones in good yields with up to 97% ee. A chiral NHC with a proximal hydroxy group is superior in comparison with the corresponding NHC with its hydroxy group protected.