Use of Thallium(I) Ethoxide in Suzuki Cross Coupling Reactions
作者:Scott A. Frank、Hou Chen、Roxanne K. Kunz、Matthew J. Schnaderbeck、William R. Roush
DOI:10.1021/ol0062446
日期:2000.8.1
[reaction: see text]Thallium(I) ethoxide promotes Suzuki cross couplings for a range of vinyl- and arylboronic acids with vinyl and aryl halide partners in good to excellent yields. This reagent offers distinct advantages over thallium(I) hydroxide in terms of commercial availability, stability, and ease of use.
Studies on the Synthesis of (−)-Spinosyn A: Application of the Steric Directing Group Strategy to Transannular Diels−Alder Reactions
作者:Scott A. Frank、William R. Roush
DOI:10.1021/jo025580s
日期:2002.6.1
highly diastereoselective and enantioselectivesynthesis of the decahydro-as-indacene nucleus 12 of (-)-spinosyn A (1) is reported. By implementing the steric directing group strategy, tricyclic lactone 37 was produced from a remarkably diastereoselective transannularDiels-Alder reaction of lactone 9. The tricyclic core of the natural product was then obtained by using an Ireland-Claisen ring contraction