Short syntheses of enantiopure calystegine B2, B3, and B4
作者:Philip R. Skaanderup、Robert Madsen
DOI:10.1039/b102353p
日期:——
Calystegine B2, B3, and B4 have been prepared in 5 steps from the benzyl protected methyl 6-iodoglycopyranosides of glucose, galactose and mannose, respectively, by using a zinc-mediated domino reaction followed by ring-closing olefin metathesis as the key steps.
A short and efficient synthesis of (+)-calystegine B 2
作者:François-Didier Boyer、Issam Hanna
DOI:10.1016/s0040-4039(00)02262-0
日期:2001.2
A short synthesis of (+)-calysteginc B-2 from (D)-glucose has been achieved, which involves as the key step a triple domino zinc-mediated reductive ring-opening, imine formation and allylation reaction of 6-iodoglucopyranose, (C) 2001 Elsevier Science Ltd. All rights reserved.
A Short Synthetic Route to the Calystegine Alkaloids
作者:Philip R. Skaanderup、Robert Madsen
DOI:10.1021/jo020645c
日期:2003.3.1
An efficient strategy is described for the synthesis of enantiopure calystegine alkaloids. The key step employs a zinc-mediated fragmentation of benzyl-protected methyl 6-iodo-glycosides followed by in situ formation of the benzyl imine and Barbier-type allylation with zinc, magnesium, or indium metal. Stereochemistry in the pivotal allylation is controlled by the choice of the metal. The functionalized