Benfatti F, de Nanteuil F, Waser J. Catalytic enantiospecific [3+2] annulation of aminocyclopropanes with ketones.
Chemistry 2012;
18:4844-9. [PMID:
22422718 DOI:
10.1002/chem.201103971]
[Citation(s) in RCA: 100] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2011] [Revised: 02/04/2012] [Indexed: 11/11/2022]
Abstract
An almost familiar ring: The first enantiospecific [3+2] annulation of donor-acceptor aminocyclopropanes with ketones is reported (see scheme; Phth=phthaloyl). The reaction is catalysed by tin(IV) chloride (5 mol %) at -78 °C and gives aminotetrahydrofurans bearing a quaternary C5 atom in high yield, diastereoselectivity and enantiospecificity (see scheme).
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