Orthogonal Cu- and Pd-Based Catalyst Systems for the O- and N-Arylation of Aminophenols
作者:Debabrata Maiti、Stephen L. Buchwald
DOI:10.1021/ja9081815
日期:2009.12.2
O- or N-arylated aminophenol products constitute a common structural motif in various potentially useful therapeutic agents and/or drug candidates. We have developed a complementary set of Cu- and Pd-based catalyst systems for the selective O- and N-arylation of unprotected aminophenols using aryl halides. Selective O-arylation of 3- and 4-aminophenols is achieved with copper-catalyzed methods employing picolinic acid or CyDMEDA, trans-N,N'-dimethyl-1,2-cyclohexanediamine, respectively, as the ligand. The selective formation of N-arylated products of 3- and 4-aminophenols can be obtained with BrettPhos precatalyst, a biarylmonophosphine-based palladium catalyst. 2-Aminophenol can be selectively N-arylated with CuI, although no system for the selective O-arylation could be found. Coupling partners with diverse electronic properties and a variety of functional groups can be selectively transformed under these conditions.
TOROPIN, N. V.;BURMISTROV, K. S., ZH. ORGAN. XIMII, 1983, 19, N 7, 1546
作者:TOROPIN, N. V.、BURMISTROV, K. S.
DOI:——
日期:——
US4535348A
申请人:——
公开号:US4535348A
公开(公告)日:1985-08-13
Toropin, N. V.; Burmistrov, K. S., Journal of Organic Chemistry USSR (English Translation), 1983, vol. 19, # 7, p. 1392 - 1393