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. Author manuscript; available in PMC: 2017 Aug 8.
Published in final edited form as: Org Lett. 2012 Feb 24;14(6):1394–1397. doi: 10.1021/ol300105q

Scheme 2. Scope of the Cyclopropanation of Natural Products Bearing Electron-Poor Alkenes with Alkynyl Sulfonium 10.a.

Scheme 2

aDiastereomeric ratios were determined by 1H NMR (500 MHz); the relative stereochemistry was not confirmed (with exception of 15) but where indicated is based on conformational considerations of the natural product substrate.