BF3·Et2O catalyzed diastereoselective nucleophilic reactions of 3-silyloxypiperidine N,O-acetal with silyl enol ether and application to the asymmetric synthesis of (+)-febrifugine
作者:Ru-Cheng Liu、Wei Huang、Jing-Yi Ma、Bang-Guo Wei、Guo-Qiang Lin
DOI:10.1016/j.tetlet.2009.04.097
日期:2009.7
The asymmetric BF3 center dot Et2O catalyzed nucleophilic reactions of 3-silyloxypiperidine N,O-acetal 10 with silyl enol ethers derived from ketones are described. (+)-Febrifugine 1, an antimalarial alkaloid, was successfully synthesized based on this nucleophilic substitution. In addition, N,O-acetal 10 was synthesized from L-benzyl glutamate in 11 steps. (C) 2009 Elsevier Ltd. All rights reserved.
Asymmetric Synthesis of AntimalarialAlkaloids (+)-Febrifugine and (+)-Isofebrifugine
作者:Pei-Qiang Huang、Bang-Guo Wei、Yuan-Ping Ruan
DOI:10.1055/s-2003-40988
日期:——
Diastereoselective α-amidoalkylation of N,O-acetal,derivated from controlled regio and diastereoselective reductionof (S)-N-(4-methoxybenzyl)-3-silyloxyglutarimideprovided two diastereomeric 6-allyl-5-silyloxy-2-piperidinonesin 76:24 selectivity. The transformation of the major diastereomerinto a known advanced intermediate allowed the synthesis of (+)-febrifugineand (+)-isofebrifugine.
A concise enantioselective synthesis of (+)-febrifugine
作者:Lourdusamy Emmanuvel、Dayanand A. Kamble、Arumugam Sudalai
DOI:10.1016/j.tetasy.2008.11.024
日期:2009.1
A short enantioselective synthesis of (+)-febrifugine, a potent antimalarial alkaloid, has been described based on the regioselective asymmetric dihydroxylation of a 1,4-dienic ester as the key step. The strategy also involves chemoselective [3,3]-sigmatropic rearrangement of 1,5-hexadiene-3-ol and intramolecular lactamization of azidolactone for the construction of piperidine core. (C) 2008 Elsevier Ltd. All rights reserved.