C2-Selective silylation of pyridines by a rhodium–aluminum complex
作者:Naofumi Hara、Nao Uemura、Yoshiaki Nakao
DOI:10.1039/d1cc00278c
日期:——
We have developed a C2-selective mono-silylation of a variety of pyridines using a Rh–Al complex. Both the site- and mono-selectivity are controlled via the pyridine coordination to the Lewis-acidic Al center prior to the activation of the pyridine C(2)–H bond at the proximal Rh center. A reaction mechanism is proposed based on several mechanistic studies, including the isolation of a (2-pyridyl)silylrhodium
Regioselective C-2 and C-6 Substitution of (<i>S</i>)-Nicotine and Nicotine Derivatives
作者:Florence C. Février、Emilie D. Smith、Daniel L. Comins
DOI:10.1021/ol052196j
日期:2005.11.1
[reaction: see text] Regioselective deprotonations of (S)-nicotine and derivatives at the C-2 and C-6 positions of the pyridine ring were performed in good to excellent yields. These methodologies allow the direct introduction of a plethora of functional groups onto the pyridine ring of nicotine.