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Synthesis 2016; 48(04): 512-519
DOI: 10.1055/s-0035-1561276
DOI: 10.1055/s-0035-1561276
feature
Gold(I)-Catalyzed Stereospecific [4+3]-Cycloaddition Reaction of 1-(Alk-1-ynyl)cyclopropyl Ketones with Nitrones: A Modular Entry to Enantioenriched 5,7-Fused Bicyclic Furo[3,4-d][1,2]oxazepines
Further Information
Publication History
Received: 12 October 2015
Accepted after revision: 06 November 2015
Publication Date:
11 January 2016 (online)
Abstract
In our previous study, a gold(I)-catalyzed stereoselective formal [4+3]-cycloaddition reaction of 1-(alk-1-ynyl)cyclopropyl ketones with nitrones was found to afford 5,7-fused bicyclic furo[3,4-d][1,2]oxazepines in good to excellent yields with high diastereoselectivity catalyzed by (triphenylphosphine)gold(I) triflate. In order to gain insight into the mechanism of this [4+3] cycloaddition process, an enantioselective version used a MeO-DTBM-BIPHEP derived gold(I) complex as the catalyst, which resulted in the kinetic resolution of the 1-(alk-1-ynyl)cyclopropyl ketones, affording the recovered ketones in high yield with excellent enantioselectivity. An interesting chirality transfer was observed in the gold(I)-catalyzed [4+3] cycloaddition of optically active 1-(alk-1-ynyl)cyclopropyl ketones with nitrones, indicating the reaction undergoes a stereospecific SN2-type ring-opening of the cyclopropane.
Supporting Information
- Supporting information for this article is available online at http://dx.doi.org/10.1055/s-0035-1561276.
- Supporting Information
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