Regioselective Functionalization of the Oxazole Scaffold Using TMP-Bases of Mg and Zn
摘要:
A general method for the synthesis of 2,4,5-trisubstituted oxazoles has been developed. Starting from commercially available oxazole, successive metalations using TMPMgCl center dot LiCl or TMPZnCl center dot LiCl led to the corresponding magnesiated or zincated species which were stable toward ring fragmentation. Furthermore, they readily reacted with various electrophiles, such as aryl and allylic halides, acid chlorides, TMSCl, and TMS-CN, providing highly functionalized oxazoles.
Imidazolylsulfonates: Electrophilic Partners in Cross-Coupling Reactions
作者:Jennifer Albaneze-Walker、Ravinder Raju、Jennifer A. Vance、Andrew J. Goodman、Michael R. Reeder、Jing Liao、Mathew T. Maust、Patrick A. Irish、Peter Espino、David R. Andrews
DOI:10.1021/ol802381k
日期:2009.4.2
Arylimidazolylsulfonates participate as electrophilic coupling partners in palladium-mediated cross-coupling reactions. The arylimidazolylsulfonates display good stability while maintaining good reactivity in a variety of palladium-catalyzed coupling reactions. Imidazolylsulfonates are a practical and economic alternative to triflates.