Halogen shuffling in pyridines: Site selective electrophilic substitutions of 2-chloro-6-(trifluoromethyl)pyridine
摘要:
When treated with lithium diisopropylamide in tetrahydrofuran at -85 degrees C and subsequently with iodine, 2-chloro-6-(trifluoromethyl)pyridine is neatly converted into its 3-iodo derivative. The latter can be quantitatively isomerized to afford 2-chloro-4-iodo-6-(trifluoromethyl)pyridine. Either iodo compound can serve as the starting material for further manipulation in reaction sequences consisting of halogen/metal exchange and electrophilic trapping. (C) 1998 Elsevier Science Ltd. All rights reserved.
Access to C(sp3) borylated and silylated cyclic molecules: hydrogenation of corresponding arenes and heteroarenes
作者:Arzoo Chhabra、Sabrina Reich、Timothy M. Shannon、Robert E. Maleczka、Milton R. Smith
DOI:10.1039/d4ra00491d
日期:——
Readily available and bench stable catalyst. Tolerates a variety of functional groups including orthogonal functionality. Circumvents the limitations of sp3 C–H borylation.