Stereoselective synthesis of swainsonines from pyridines
作者:Gerres Heimgärtner、Dirk Raatz、Oliver Reiser
DOI:10.1016/j.tet.2004.10.086
日期:2005.1
efficient synthesis of (−)-swainsonine and (−)-2,8a-di-epi-swainsonine was developed starting from readily available 2-pyridinecarbaldehyde and 3-hydroxypyridine. In particular, it was demonstrated that the mixture of simple indolizidines, i.e. lentiginosine and epi-lentiginosine, being readily available by a number of different synthetic routes, can be directly converted to swainsonine.
Stereoselective synthesis of (+)- and (−)-lentiginosine
作者:Mk Gurjar、Lakshmi Ghosh、M Syamala、V Jayasree
DOI:10.1016/s0040-4039(00)78520-0
日期:1994.11
Simple routes to (1,2,8a)- and (1,2,8a)-lentiginosine have been described, based on Sharpless asymmetric dihydroxylation, starting from ()- and ()-pipecolinic acids.
An expedient total synthesis of optically active piperidine and indolizidine alkaloids (−)-β-conhydrine and (−)-lentiginosine
作者:Ahmed Kamal、Saidi Reddy Vangala
DOI:10.1016/j.tet.2010.11.011
日期:2011.2
Attempts directed toward the stereocontroled total synthesis of piperidine and indolizidine alkaloids resulted in the synthesis of (−)-β-conhydrine 1 and (−)-lentiginosine 3. The synthesis of 1 and 3 were developed from protected d-mannitol as the chiral precursor, which involved nucleophilic addition and azide nucleophilic substitution, Barbier allylation, ring closing metathesis, and Sharpless asymmetric