Negishi Cross-Couplings of Unsaturated Halides Bearing Relatively Acidic Hydrogen Atoms with Organozinc Reagents
作者:Georg Manolikakes、Matthias A. Schade、Carmen Muñoz Hernandez、Herbert Mayr、Paul Knochel
DOI:10.1021/ol8009013
日期:2008.7.3
A wide range of polyfunctional aryl, heteroaryl, alkyl, and benzylic zinc reagents were coupled with unsaturated halides bearing an acidic NH or OH function, using Pd(OAc)(2) (1 mol %) and S-Phos (2 mol %) as catalyst without the need of protecting groups.
Palladium- and Nickel-Catalyzed Cross-Couplings of Unsaturated Halides Bearing Relatively Acidic Protons with Organozinc Reagents
作者:Georg Manolikakes、Carmen Muñoz Hernandez、Matthias A. Schade、Albrecht Metzger、Paul Knochel
DOI:10.1021/jo8015852
日期:2008.11.7
aryl, heteroaryl, alkyl, and benzylic zinc reagents were coupled with unsaturated aryl halides bearing an acidic NH or OH proton, using Pd(OAc)2 (1 mol %) and S-Phos (2 mol %) as catalyst without the need of protecting groups. A similar nickel-catalyzed reaction is described. The relative kinetic basicity of organozinc compounds as well as their stability toward acidic protons is also described.
N-substituted 4-(5-indolyl)benzoic acids. Synthesis and evaluation of steroid 5α-reductase type I and II inhibitory activity
作者:Eckhard Baston、Rolf W. Hartmann
DOI:10.1016/s0960-894x(99)00234-6
日期:1999.6
The synthesis of N-alkyl and N-arylalkyl substituted 4-(5-indolyl)benzoic acid derivatives as inhibitors of steroid 5alpha-reductases is described. For the human type II isozyme a benzyl substituent (IC50 6.20 microM) and for the human type I isozyme a cyclohexanemethyl substituent (IC50 2.10 microM) on the indole nitrogen proved to be most efficacious, thus providing interesting leads for the development