Klepp J, Bousfield T, Cummins H, Legendre SVAM, Camp JE, Greatrex BW. Oxa-Michael-initiated cascade reactions of levoglucosenone.
Beilstein J Org Chem 2022;
18:1457-1462. [PMID:
36300013 PMCID:
PMC9577383 DOI:
10.3762/bjoc.18.151]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2022] [Accepted: 09/30/2022] [Indexed: 11/23/2022] Open
Abstract
The reactions of aromatic aldehydes and levoglucosenone promoted by methoxide gives bridged α,β-unsaturated ketones, formed by a series of oxa-Michael-initiated cascade reactions in yields of up to 91% (14 examples). A complex series of equilibria operate during the reaction, and the formation of the bridged species is thermodynamically favored, except in the case of 5-methylfurfural and pyrrole-2-carboxaldehyde. This is the first report detailing this type of aldol/Michael cascade involving oxa-Michael initiation.
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