Brown JA, Chudasama V, Giles ME, Gill DM, Keegan PS, Kerr WJ, Munday RH, Griffin K, Watts A. E- and Z-stereoselectivity in the preparation of enamides from glycidyl sulfonamides and carbamates.
Org Biomol Chem 2012;
10:509-11. [PMID:
22124587 DOI:
10.1039/c1ob06569f]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Treatment of glycidyl sulfonamides with LDA delivers the corresponding enesulfonamide with good selectivity for the E-isomer, whereas the corresponding carbamates exhibit selectivity for the Z-enecarbamate. An E1cB elimination mechanism proceeding from a substrate-base chelate complex is advanced as rationalisation of the latter set of Z-selective outcomes.
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