Decarboxylative/Sonogashira-type cross-coupling using PdCl<sub>2</sub>(Cy*Phine)<sub>2</sub>
作者:Yong Yang、Yee Hwee Lim、Edward G. Robins、Charles W. Johannes
DOI:10.1039/c6ra12916a
日期:——
Expedient protocol to access a wide range of internal alkynes and symmetrical di(heteroaryl)alkynesviatandem decarboxylative–Sonogashira cross-coupling.
通过串联脱羧化-Sonogashira交叉偶联方法访问广泛的内部炔烃和对称的双(杂环烷基)炔烃。
Alkynylation of halopyridazines and their N-oxides.
作者:AKIO OHSAWA、YOSHIHITO ABE、HIROSHI IGETA
DOI:10.1248/cpb.28.3488
日期:——
Various 3-alkynylpyridazines have been prepared by cross-coupling of 3-halopyridazines and monosubstituted acetylenes in Et2NH with Pd (PPh3)2Cl2-CuI as a catalyst. Though the alkynylation of 3-chloropyridazine 1-oxides afforded 3-alkynylpyridazine 1-oxides, attempts to obtain 3-chloropyridazine 2-oxides were unsuccessful. N-Oxidation of 3-alkynylpyridazines with m-chloroperbenzoic acid yielded their 1-oxides exclusively
A straightforward copper-free palladium methodology for the selective alkynylation of a wide variety of S-, O-, and N-based mono- and diheterocyclic bromides and chlorides
High-yield alkynylations are successfully achieved by a simple and widely accessible catalytic system for an unprecedented variety of heterocyclic bromides and chlorides in position -2, -3 or -5: pyridine, quinoline, thiophene, furan, thiazole, benzothiazole, pyrimidine, pyridazine, pyrazine, dioxepin halides are efficiently functionalized in short time reactions. This copper-free methodology employs 1 mol% palladium only, with inexpensive PPh3 and amine base. The ionic liquid solvent allows a straigtforward separation of products and recycling opportunity. Unsuitable substrates and secondary reactions are also reported in order to point out further progress in cross-coupling using ionic liquids. (C) 2009 Elsevier Ltd. All rights reserved.
Synthesis of Unsymmetrical 3,6-Disubstituted Pyridazines. A Palladium-Catalyzed Approach from 3-Iodopyridazines
作者:Tandy L. Draper、Thomas R. Bailey
DOI:10.1021/jo00108a049
日期:1995.2
OHSAWA AKIO; ABE YOSHIHITO; IGETA HIROSHI, CHEM. AND PHARM. BULL., 1980, 28, NO 12, 3488-3493