【题名】:Organocatalytic Asymmetric Tandem Michael Addition−Hemiacetalization: A Route to Chiral Dihydrocoumarins, Chromanes, and 4H-Chromenes 【期刊】:J. Org. Chem., 【年、卷、期、起止页码】:2010, 75 (20), pp 6900–6907 【全文链接】: http://pubs.acs.org/doi/abs/10.1021/jo101446d?source=chemport&journalCode=joceah