Enantioselective Construction of a 2,8-Dioxabicyclo[3.2.1]octane Ring System via [2,3]-Sigmatropic Rearrangement of Oxonium Ylide Using Chiral Dirhodium(II) Carboxylates

Enantioselective Construction of a 2,8-Dioxabicyclo[3.2.1]octane Ring System via [2,3]-Sigmatropic Rearrangement of Oxonium Ylide Using Chiral Dirhodium(II) Carboxylates

Dirhodium(II) tetrakis[N-tetrafluorophthaloyl-(S)-tert-leucinate], Rh2(S-TFPTTL)4, is an exceptionally efficient catalyst for enantioselective tandem cyclic oxonium ylide formation and [2,3]-sigmatropic rearrangement from α-diazo-β-ketoester bearing cyclic allylic acetal functionality, providing the...

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Veröffentlicht in:Chemistry letters 2009-05, Vol.38 (5), p.488-489
Hauptverfasser: Shimada, Naoyuki, Nakamura, Seiichi, Anada, Masahiro, Shiro, Motoo, Hashimoto, Shunichi
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container_end_page 489
container_issue 5
container_start_page 488
container_title Chemistry letters
container_volume 38
creator Shimada, Naoyuki
Nakamura, Seiichi
Anada, Masahiro
Shiro, Motoo
Hashimoto, Shunichi
description Dirhodium(II) tetrakis[N-tetrafluorophthaloyl-(S)-tert-leucinate], Rh2(S-TFPTTL)4, is an exceptionally efficient catalyst for enantioselective tandem cyclic oxonium ylide formation and [2,3]-sigmatropic rearrangement from α-diazo-β-ketoester bearing cyclic allylic acetal functionality, providing the 2,8-dioxabicyclo[3.2.1]octane core structure of zaragozic acids in up to 93% ee.
doi_str_mv 10.1246/cl.2009.488
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title Enantioselective Construction of a 2,8-Dioxabicyclo[3.2.1]octane Ring System via [2,3]-Sigmatropic Rearrangement of Oxonium Ylide Using Chiral Dirhodium(II) Carboxylates
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