title: The regioselective homocoupling of meta-hydroxypyridines with hypervalent iodine(III).
abstract: The C - H homocoupling of meta-hydroxypyridines with phenyliodine(III) diacetate (PIDA) was carried out in dichloromethane at room temperature in the presence of cesium carbonate. The coupling reaction is highly regioselective with respect to the hydroxy group at the pyridine ring. Comparative control experiments with meta-alkoxypyridine suggest that the meta-hydroxy group at the pyridine ring plays a key role during the homocoupling reaction.
authors: National Sun Yat Sen University, Department of Chemistry, 70 Lienhai Rd., Kaohsiung 80424 (Taiwan).
authors: Ping Syun
authors: PS
authors: Yang
authors: Mi Ting
authors: MT
authors: Tsai
authors: Meng Han
authors: MH
authors: Tsai
authors: Chi Wi
authors: CW
authors: Ong
keywords: 3,3′-dihydroxy-2,2′-bipyridine; direct CC bond formation; hypervalent iodine; meta-hydroxypyridines; metal-free CH homocoupling reaction