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.
TMSCH2Li-induced regioselective lithiation of (S)-nicotine
作者:Philippe C. Gros、Abdelatif Doudouh、Christopher Woltermann
DOI:10.1039/b612786j
日期:——
The first regioselective C-4 lithiation of (S)-nicotine has been realized using TMSCH2Li as basic reagent in toluene. The reaction proceeded under mild conditions with a small excess of electrophile. The 4-chloro derivative was subsequently metallated at C-5 with the same basic reagent in THF at -78 degrees C. This methodology opens a straightforward access to functional diversity in (S)-nicotine chemistry
Synthesis of C-4 Substituted Amido Nicotine Derivatives via Copper(I)- and (II)-Catalyzed Cross-Coupling Reactions
作者:Jiancheng Zhu、Monica F. Enamorado、Daniel L. Comins
DOI:10.1021/acs.joc.6b02319
日期:2016.11.18
The syntheses of seven novel amido nicotine derivatives 12–18 from (S)-nicotine are presented. (S)-Nicotine and (S)-6-chloronicotine derivatives were cross-coupled with the corresponding amides 6–10 at the C-4 position of the pyridine ring via copper(I)-mediated reactions. Derivatives 16–18 were also obtained via copper(II)-mediated reactions from (S)-nicotine containing a C-4 boronic acid pinacol