Protecting-group-free catalytic asymmetric total synthesis of (−)-rosmarinecine
The protecting-group-free asymmetric total synthesis of (−)-rosmarinecine was achieved in only four steps from the commercially available (±)-3-hydroxypyrrolidine hydrochloride (2a). The key steps include the direct oxidation of (±)-2a to (±)-3-hydroxy-1-pyrroline N-oxide (1a) using the Davis reagen...
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Published in | Tetrahedron Vol. 68; no. 36; pp. 7295 - 7301 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
OXFORD
Elsevier Ltd
09.09.2012
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | The protecting-group-free asymmetric total synthesis of (−)-rosmarinecine was achieved in only four steps from the commercially available (±)-3-hydroxypyrrolidine hydrochloride (2a). The key steps include the direct oxidation of (±)-2a to (±)-3-hydroxy-1-pyrroline N-oxide (1a) using the Davis reagent and the domino reaction; viz., the lipase-catalyzed dynamic kinetic resolution of (±)-1a with 1-ethoxyvinyl ethyl maleate followed by the intramolecular [3+2] dipolar cycloaddition reaction of the generated optically active ester. Some insights into the mechanism of the racemization of the optically active 1a, observed during the enzymatic process, were also obtained.
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Bibliography: | KAKEN ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0040-4020 1464-5416 |
DOI: | 10.1016/j.tet.2012.06.095 |