Michael-type Addition of 1,8-Diazabicyclo[5.4.0]undec-7-ene to Dimethyl Acetylenedicarboxylate
Ma, L. and David Dolphin
J. Chem. Soc., Chem. Commun.
Michael reaction of DBU with dimethyl acetylenedicarboxylate and subsequent intramolecular condensation of the adduct gives a tricyclic derivative; a mechanism for its formation is proposed and an X-ray crystal structure is presented.