Highly efficient synthesis of phenanthroquinolizidine alkaloids via Parham-type cycliacylation
摘要:
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.
Total Synthesis of Phenanthro-Quinolizidine Alkaloids: (±)-Cryptopleurine, (±)-Boehmeriasin A, (±)-Boehmeriasin B and (±)-Hydroxycryptopleurine
作者:Mingbo Cui、Qingmin Wang
DOI:10.1002/ejoc.200900834
日期:2009.11
The first synthesis of (±)-boehmeriasin A and B and a concise synthesis of (±)-cryptopleurine and (±)-hydroxycryptopleurine are described. The piperidine ring of these alkaloids was constructed by the coupling of the phenanthrene ring with 2-bromopyridine through a nucleophilic substitution reaction and subsequent reduction of the resulting pyridyl ketone. The first crystal structure of a phenanthro-quinolizidine