Vepreva A, Yanovich A, Dar’in D, Kantin G, Bunev A, Krasavin M. A novel spirocyclic scaffold accessed via tandem Claisen rearrangement/intramolecular oxa-Michael addition.
Beilstein J Org Chem 2022;
18:1649-1655. [PMID:
36570564 PMCID:
PMC9749547 DOI:
10.3762/bjoc.18.177]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Accepted: 11/11/2022] [Indexed: 12/12/2022] Open
Abstract
A straightforward access to novel spiro[benzofuran-2,3'-pyrrolidine]-2',5'-diones based on the Rh2(esp)2-catalyzed insertion of carbenes derived from diazo arylidene succinimides (DAS) into the O-H bond of phenols is described. The initial adducts underwent a thermally promoted Claisen rearrangement followed by DABCO-catalyzed intramolecular 5-exo-trig oxa-Michael addition.
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