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DOI: 10.1055/s-0033-1340509
Scalable Synthesis of Strained Cyclooctyne Derivatives
Publication History
Received: 28 October 2013
Accepted after revision: 09 December 2013
Publication Date:
10 January 2014 (online)
Abstract
Modifications to the Popik synthesis of aza-dibenzocyclooctyne (DIBAC) derivatives are described, which avoids tedious purifications and dramatically improves the yield. A new and analogous route to biarylazacyclooctynone (BARAC) through an amide disconnection was also attempted. The BARAC derivatives prepared were found to be unstable under the conditions employed, undergoing a known rearrangement. Finally, the synthesis of a difluoro-DIBAC derivative with a second-order rate constant intermediate between DIBAC and BARAC derivatives (0.50 M–1) is described. While more difficult to synthesize, this molecule was found to be considerably more stable than any BARAC derivatives that were prepared.
Supporting Information
- for this article is available online at http://www.thieme-connect.com/ejournals/toc/synthesis.
- Supporting Information
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