A new approach for the regioselective functionalization of the C-3-position of quinolines is described. The method utilizes heteroatom guided regioselective C-3 palladation followed by arylation via transmetalation with aryl boronic acids to yield 3-aryl-N-acyl-1,2-dihydroquinolines. In a one-pot sequence, N-deacylation followed by aromatization leads to important 3-arylquinolines in good yields.
1-Acyl-2-alkyl-3,4-epoxy-1,2,3,4-tetrahydroquinolines — Synthesis and Reactions with N-Nucleophiles
作者:Martin Kratzel、Romana Hiessböck
DOI:10.3987/com-94-6677
日期:——
Epoxide opening of the title compounds (6) with primary or secondary amines using lithium perchlorate as catalyst gave 1,2,3,4-tetrahydroquinolines with stereochemically well defined substitution pattern in the piperidine moiety (7,8). By-products (9,10), formed by acyl migration, were observed.
Enantioselective Synthesis of 4-Cyanotetrahydroquinolines via Ni-Catalyzed Hydrocyanation of 1,2-Dihydroquinolines
作者:Mingdong Jiao、Jihui Gao、Xianjie Fang
DOI:10.1021/acs.orglett.0c03171
日期:2020.11.6
A Ni-catalyzed asymmetric hydrocyanation that enables the formation of 4-cyanotetrahydroquinolines in good yields with excellent enantioselectivities is presented herein. A variety of functional groups are well-tolerated, and a gram-scale reaction supports the synthetic potential of the transformation. Additionally, several crucial intermediates for pharmaceutically active agents, including a PGD2
Catalyst Control in Switching the Site Selectivity of C−H Olefinations of 1,2‐Dihydroquinolines: An Approach to Positional‐Selective Functionalization of Quinolines
olefinations exclusively at the C-3- or C-8-positions in the quinoline framework has been developed by catalystcontrol. Distal C(3)-H functionalization is achieved by using palladium catalysis, whereas proximal C(8)-H functionalization is obtained by employing ruthenium catalysis. Switching the siteselectivity within a single substrate directly indicates two diverse pathways, which are operating under the