Year 2005, Month 6 (Section Brief Communications, Page 1537)
Stereoselective synthesis of spiro derivatives of
2,4-dimethyl-2,3,4,4a,5,6-hexahydro-6H-benzo[c]quinolizine
E. V. Deeva, T. V. Glukhareva, N. A. Zybina, and Yu. Yu. Morzherin*
The reactions of 2-(3,5-dimethylpiperidino)benzaldehyde with Meldrum´s acid and cyclohexane-1,3-dione occur as a tandem of the Knoevenagel condensation and cyclization promoted by the tert-amino effect. The cyclization yields only one isomer with the axial hydrogen
atoms in positions 4 and 4a of the benzoquinolizine ring.
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