Organometallic alkylation of 2-chloro-4,6-dimethoxy-1,3,5-triazine: a study
摘要:
The reactivity of 2-chloro-4,6-dimethoxy-1,3,5-triazine (1) has been investigated in Pd- or Ni-catalyzed cross-coupling processes with organostannanes, Grignard reagents, organoalanes and organozinc halides. All organometallic reagents considered form new C-C bonds on the heteroaromatic ring and afford the corresponding 2-alkyl-4,6-dimethoxy-1,3,5-triazines in moderate to very good yields. The collected data allows the choice of the alkylating agent as well as the experimental conditions depending on the residue to transfer. (c) 2005 Elsevier Ltd. All rights reserved.
Pd- and Ni-Catalyzed Cross-Coupling Reactions of Functionalized Organozinc Reagents with Unsaturated Thioethers
作者:Laurin Melzig、Albrecht Metzger、Paul Knochel
DOI:10.1002/chem.201002850
日期:2011.3.1
serve as electrophiles in this cross‐coupling reaction. Aryl‐, heteroaryl‐, benzylic, and alkylzinc halides with sensitive functionalities, such as ester, nitrile, or ketone groups react at ambient temperature with unsaturated thioethers using a Ni catalyst. The corresponding Pd‐catalyzed reactions require slightly higher temperatures. Large‐scale cross‐coupling experiments (10–20 mmol) with N‐heterocycles
A variety of functionalized aryl bromides or benzyl chlorides were coupled with 2-chloro-4,6-dimethoxy-1,3,5-trazine in good yields by a one-step procedure via cobalt catalysis.