Formyl group activation of a bromopyrrole ester in Suzuki cross-coupling reactions: application to a formal synthesis of Polycitone A and B and Polycitrin A
作者:John T. Gupton、Nakul Telang、Michael Wormald、Kristin Lescalleet、Jon Patteson、Will Curry、Andrew Harrison、Megan Hoerrner、John Sobieski、Michael Kimmel、Emily Kluball、Thomas Perry
DOI:10.1016/j.tet.2014.02.091
日期:2014.4
which allows for the regiospecific synthesis of 2,3,5-trisubstituted pyrroles and 2,3,4,5-tetrasubstituted pyrroles. Optimization studies are presented for the preparation of the pyrrole building block along with the evaluation of various cross-coupling conditions and cross-coupling agents. A short, formal synthesis of the natural products Polycitone A, Polycitone B, and Polycitrin A from the pyrrole
描述了一种新的吡咯构件,它允许 2,3,5-三取代的吡咯和 2,3,4,5-四取代的吡咯的区域特异性合成。介绍了制备吡咯结构单元的优化研究以及对各种交叉偶联条件和交叉偶联剂的评估。还描述了从吡咯构建块合成天然产物 Polycitone A、Polycitone B 和 Polycitrin A 的简短正式合成。
The application of vinylogous iminium salt derivatives and microwave accelerated Vilsmeier–Haack reactions to efficient relay syntheses of the polycitone and storniamide natural products
作者:John T. Gupton、Edith J. Banner、Melissa D. Sartin、Matthew B. Coppock、Jonathan E. Hempel、Anastasia Kharlamova、Daniel C. Fisher、Ben C. Giglio、Kristin L. Smith、Matt J. Keough、Timothy M. Smith、Rene P.F. Kanters、Raymond N. Dominey、James A. Sikorski
DOI:10.1016/j.tet.2008.03.038
日期:2008.5
vinylogous iminium salts and microwave accelerated Vilsmeier-Haack formylations are described. The successful strategy relies on the formation of a 2,4-disubstituted pyrrole or a 2,3,4-trisubstituted pyrrolefrom a vinamidinium salt or vinamidinium salt derivative followed by formylation at the 5-position of the pyrrole. Subsequent transformations of the selectively formylated pyrroles lead to efficient