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.
Methods of synthesizing nicotine analogs and derivatives are described. In some embodiments the methods utilize an alkyl or aryl silyl-substituted nicotine analog intermediate. Intermediates useful for the synthesis of nicotine and nicotine analogs are also described.
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