Synthesis of Fully Substituted Pyrazoles via Regio- and Chemoselective Metalations
摘要:
The full functionalization of the pyrazole ring was achieved by successive regioselective metalations using TMPMgCl center dot LiCl and TMP2Mg center dot 2LiCl. Trapping with various electrophiles led to trisubstituted pyrazoles. An application to the synthesis of the acaricide Tebufenpyrad is reported.
(pyridines, pyrimidines, pyrazines, pyridazines, triazines, benzothiazoles, benzoxazoles, pyrazoles, benzindazoles, quinazolines, etc.) undergo smooth Pd-catalyzedcross-coupling reactions with functionalized aryl-, heteroaryl-, benzylic-, and alkylzinc reagents using Pd(OAc)2/S-Phos as the catalytic system mostly at 25 °C. No copper salt is required to perform these reactions.
Guimon, Claude; Pfister-Guillouzo, Genevieve; Begtrup, Mikael, Canadian Journal of Chemistry, 1983, vol. 61, p. 1197 - 1203
作者:Guimon, Claude、Pfister-Guillouzo, Genevieve、Begtrup, Mikael
DOI:——
日期:——
Synthesis and Biological Evaluation of Dimeric Furanoid Macroheterocycles: Discovery of New Anticancer Agents
作者:K. C. Nicolaou、Christian Nilewski、Christopher R. H. Hale、Christopher F. Ahles、Chiao An Chiu、Christian Ebner、Abdelatif ElMarrouni、Lifeng Yang、Katherine Stiles、Deepak Nagrath
DOI:10.1021/jacs.5b00141
日期:2015.4.15
A recently developed dimerization/macrocyclization was employed to synthesize a series of macroheterocycles which were biologically evaluated, leading to the discovery of a number of potent cytotoxic agents (e.g., 27: GI50 = 51 nM against leukemia CCRF-CEM cell line; 29: GI50 = 99 nM against melanoma MDA-MB-435 cell line). Further biological studies support an apoptosis mechanism of action for these
The full functionalization of the pyrazole ring was achieved by successive regioselective metalations using TMPMgCl center dot LiCl and TMP2Mg center dot 2LiCl. Trapping with various electrophiles led to trisubstituted pyrazoles. An application to the synthesis of the acaricide Tebufenpyrad is reported.