Efficient and Chirally Specific Synthesis of Phenanthro-Indolizidine Alkaloids by Parham-Type Cycloacylation
作者:Ziwen Wang、Zheng Li、Kailiang Wang、Qingmin Wang
DOI:10.1002/ejoc.200900920
日期:2010.1
A concise, efficient and modular route involving Parham-type cycloacylation as the key step has been used to synthesize six enantiopure phenanthro-indolizidine alkaloids 1a-c. The preparation of enantiomericallypure tylophora alkaloids and their seco analogues on a large-scale is now feasible. The alcohol intermediates 8a-c, which are difficult to prepare by other synthetic methodologies, have been
Highly efficient synthesis of phenanthroquinolizidine alkaloids via Parham-type cycliacylation
作者:Ziwen Wang、Qingmin Wang
DOI:10.1016/j.tetlet.2009.12.135
日期:2010.3
A concise and efficient route involving Parham-type cycliacylation as the key step has been used to synthesize phenanthroquinolizidine alkaloids 1a-c and 2a-c. Among the products, 1b-(S), 1b-(R), 2a-(14S,15S), 2a-(14aR,15R), and 2b were synthesized for the first time. (C) 2010 Elsevier Ltd. All rights reserved.