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. 2006 May 1;62(18):4573-4583.
doi: 10.1016/j.tet.2006.02.042.

Surveying approaches to the formation of carbon-carbon bonds between a pyran and an adjacent ring

Jeffrey D Frein  1 , Tomislav Rovis
Affiliations

Surveying approaches to the formation of carbon-carbon bonds between a pyran and an adjacent ring

Jeffrey D Frein et al. Tetrahedron. .

Abstract

We have examined several methods for the stereoselective formation of carbon-carbon bonds between contiguous rings where a stereogenic center is already present. The approaches investigated were a [1,3] oxygen to carbon rearrangement of cyclic vinyl acetals, an intermolecular enolsilane addition into an in situ generated oxocarbenium ion, an intramolecular conjugate addition of tethered alkoxy enones, and epimerization of several α-pyranyl cycloalkanones. These routes have been found to be complementary in several cases and have enabled formation of both the trans:anti and cis:anti stereoisomers in good to excellent yields and varying diastereoselectivities. We have proven C2-C2' relative stereochemistry of 1-2 via a chemical correlation.

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