A convenient one-pot Negishi coupling of amino-heteroaryl chlorides and alkyl bromides
作者:Iain A.S. Walters
DOI:10.1016/j.tetlet.2005.11.013
日期:2006.1
A simple Ni-catalysed cross-coupling protocol for amino-heteroaryl chlorides with alkylzinc reagents has been developed. The alkylzinc reagents can be commercially available dialkylzincs or alkylzinc halides, or can be conveniently generated in situ from diethylzinc and primary alkylbromides in the presence of the same inexpensive Ni catalyst used to effect the subsequent coupling reaction.
PYRIDINE DERIVATIVES: PART VI MALONATIONS OF SUBSTITUTED NITROPYRIDINES
作者:W. Gruber
DOI:10.1139/v53-152
日期:1953.12.1
5-Hydroxy-2-alkylpyridines (VII) were prepared by a sequence of reactions starting with the malonation of 2-chloro-5-nitropyridine with diethyl alkylmalonates. Malonation failed with 4-methoxy-3-nitropyridine (VIII) and 2-chloro-3-nitropyridine (XII), yielding decomposition products only. Reactivity of the. methoxyl groups in 4-methoxy-3-nitropyridine (VIII) and in 2-methoxy-3-nitropyridine (XV) was