Tacamonine has been synthesized in 3.2% overall yield from cyclohexanone-4-carboxylic acid ethyleneacetal. The tetrahydro-beta-carboline intermediate was submitted to a Mannich reaction to provide a bridged ring system embodying latent branches of the quinolizidine portion. The final stages included fragmentation and Grignard reaction. (C) 2002 Published by Elsevier Science Ltd.
Tacamonine has been synthesized in 3.2% overall yield from cyclohexanone-4-carboxylic acid ethyleneacetal. The tetrahydro-beta-carboline intermediate was submitted to a Mannich reaction to provide a bridged ring system embodying latent branches of the quinolizidine portion. The final stages included fragmentation and Grignard reaction. (C) 2002 Published by Elsevier Science Ltd.