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.
Regioselective halogenation of nicotine and substituted nicotines
申请人:Comins L. Daniel
公开号:US20050131030A1
公开(公告)日:2005-06-16
A first aspect of the present invention is a method for of making a compound of Formula Ia or Formula Ib:
wherein X is halo, by (a) metalating a precursor compound to form an organometallic intermediate, and then reacting the organometallic intermediate with a halogenating agent to produce the compound of Formula Ia or Formula Ib.
Methods of synthesizing nicotine analogs and derivatives are described. The methods are particularly useful for the regioselective production of enantiomerically pure nicotine anlogs having substituents at the C4 position. Intermediates useful for the synthesis of such compounds are also described.
[EN] REGIOSPECIFIC SYNTHESIS OF NICOTINE DERIVATIVES<br/>[FR] SYNTHESE REGIOSPECIFIQUE DE DERIVES DE NICOTINE
申请人:UNIV NORTH CAROLINA STATE
公开号:WO2005058920A1
公开(公告)日:2005-06-30
Methods of synthesizing nicotine analogs and derivatives are described. The methods are particularly useful for the regioselective production of enantiomerically pure nicotine analogs having substituents at the C4 position. Intermediates useful for the synthesis of such compounds are also described.
Synthesis of C-4 Substituted Nicotine Derivatives via an <i>N</i>-Acylpyridinium Salt of (<i>S</i>)-Nicotine
作者:Daniel L. Comins、Laura S. King、Emilie D. Smith、Florence C. Février
DOI:10.1021/ol0520469
日期:2005.10.1
of novel nicotine derivatives were prepared from (S)-nicotine via a two-step sequence. Addition of a cuprate reagent to an N-acylpyridinium salt of nicotine, followed by aromatization with elemental sulfur, afforded C-4 substituted nicotines in moderate to high yield. Using this method, 4-(dimethylphenylsilyl)nicotine was prepared and oxidized to afford (S)-4-hydroxynicotine.