Henry Rzepa's Blog Chemistry with a twist

November 23, 2015

A tutorial problem in stereoelectronic control. The Tiffeneau-Demjanov rearrangement as part of a prostaglandin synthesis.

Filed under: Interesting chemistry,reaction mechanism — Tags: , , , — Henry Rzepa @ 11:33 am

This reaction emerged a few years ago (thanks Alan!) as a tutorial problem in organic chemistry, in which students had to devise a mechanism for the reaction and use this to predict the stereochemical outcome at the two chiral centres indicated with *.  It originates in a brief report from R. B. Woodward’s group in 1973 describing a prostaglandin synthesis,[1] the stereochemical outcome being crucial. Here I take a look at this mechanism using computation.

(more…)

References

  1. R.B. Woodward, J. Gosteli, I. Ernest, R.J. Friary, G. Nestler, H. Raman, R. Sitrin, C. Suter, and J.K. Whitesell, "Novel synthesis of prostaglandin F2.alpha.", Journal of the American Chemical Society, vol. 95, pp. 6853-6855, 1973. http://dx.doi.org/10.1021/ja00801a066

Powered by WordPress