Ueda M, Uenoyama Y, Terasoma N, Doi S, Kobayashi S, Ryu I, Murphy JA. A construction of 4,4-spirocyclic γ-lactams by tandem radical cyclization with carbon monoxide.
Beilstein J Org Chem 2013;
9:1340-5. [PMID:
23946829 PMCID:
PMC3740707 DOI:
10.3762/bjoc.9.151]
[Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2013] [Accepted: 06/17/2013] [Indexed: 11/23/2022] Open
Abstract
A straightforward synthesis of 4,4-spirocyclic indol γ-lactams by tandem radical cyclization of iodoaryl allyl azides with CO was achieved. The reaction of iodoaryl allyl azides, TTMSS and AIBN under CO pressure (80 atm) in THF at 80 °C gave the desired 4,4-spirocyclic indoline, benzofuran, and oxindole γ-lactams in moderate to good yields.
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