Synthesis of 4-Methyldienoates Using a Vinylogous Horner−Wadsworth−Emmons Reagent. Application to the Synthesis of Trichostatic Acid
作者:John T. Markiewicz、Douglas J. Schauer、Joakim Löfstedt、Steven J. Corden、Olaf Wiest、Paul Helquist
DOI:10.1021/jo902422y
日期:2010.3.19
The utility of the unsaturatedphosphonate 1 as a vinylogous Horner−Wadsworth−Emmons reagent was explored in reactions with aldehydes affording 4-methyldienoate esters. Factors that affect E/Z selectivity were studied. A simplified synthesis of trichostatic acid 3 was accomplished to demonstrate utility of this reagent.
produce the Eisomers of anti‐homoallylic alcohols. On the other hand, the corresponding Zisomers of anti‐homoallylic alcohols are obtained when a dimeric palladium(I) complex is employed as the catalyst for this double‐bond transposition. Thus, both E and Zisomers can be synthesized from the same starting materials. A B−C(sp2) bond remaining with the allylation product undergoes the Suzuki–Miyaura