Diastereoselective synthesis of new polyhydroxylated indolizidines from ( l)-glutamic acid
A diastereoselective synthesis of two new swainsonine's analogues 1a and 1b with the piperidine ring fused to a phenyl nucleus at C6-C7, namely (1 R, 2 S, 10 R, 10a R)-(+)-1,2,10-trihydroxy-1,2,3,5,10,10a-hexahydrobenzo[ f] indolizine ( 1a ) and (1 S, 2 R, 10 R, 10a R)-(+)-1,2,10-trihydroxy-1,...
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Published in | Tetrahedron Vol. 61; no. 20; pp. 4743 - 4754 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier Ltd
01.05.2005
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Subjects | |
Online Access | Get full text |
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Summary: | A diastereoselective synthesis of two new swainsonine's analogues
1a
and
1b
with the piperidine ring fused to a phenyl nucleus at C6-C7, namely (1
R, 2
S, 10
R, 10a
R)-(+)-1,2,10-trihydroxy-1,2,3,5,10,10a-hexahydrobenzo[
f] indolizine (
1a
) and (1
S, 2
R, 10
R, 10a
R)-(+)-1,2,10-trihydroxy-1, 2, 3, 5, 10, 10a-hexahydrobenzo[
f] indolizine (
1b
), is described. Throughout this work, the effectiveness of the tricyclic indolizidine dione
5
, readily available in three steps from the cheap
l-glutamic acid, as an attractive platform for chemo- and stereodivergent transformations is illustrated. The key steps involved totally diastereoselective ketone reduction of compound
5
and catalytic
cis-dihydroxylation of the unsaturated amide
10
. The synthetic strategy also allowed for the diastereoselective synthesis of benzoanalogues of the 1,8a-di-
epi-lentiginosine
3a
((1
R, 2
S, 10a
R)-(+)-1,2-dihydroxy-1, 2, 3, 5, 10, 10a-hexahydrobenzo[
f]indolizine) and 2,8a-di-
epi-lentiginosine
3b
((1
S, 2
R, 10a
R)-(+)-1,2-dihydroxy-1,2,3,5,10,10a-hexahydrobenzo[
f]indolizine).
Graphical Abstract |
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ISSN: | 0040-4020 1464-5416 |
DOI: | 10.1016/j.tet.2005.03.029 |