chemistry can be exploited for the synthesis of diverse ranges of small molecules from α-diazo carbonyl compounds. In this paper, three synthetic approaches to α-diazo amides are described, and their scope and limitations are determined. On the basis of these synthetic studies, recommendations are provided to assist the selection of the most appropriate approach for specific classes of product. The
Preparation of trans-2-allyl-6-alkyl(aryl)-1,2,3,6-tetrahydropyridines by reductive trans-2,6-dialkylation of pyridine. Synthesis of (±)-epidihydropinidine
作者:Yuri N Bubnov、Elena V Klimkina、Anatoly V Ignatenko、Ilya D Gridnev
DOI:10.1016/0040-4039(95)02383-6
日期:1996.2
A convenient method for the preparation of the title compounds involving the sequential treatment of pyridine with RLi (R = Alk, Ar), triallylborane and methanol is developed.
Synthesis and molecular structure oftrans-2-allyl-6-phenyl-1,2,3,6-tetrahydropyridine hydrochloride
作者:Yu. N. Bubnov、E. V. Klimkina、M. O. Dekaprilevich、Yu. T. Strruchkov
DOI:10.1007/bf01431124
日期:1996.11
When treated with triallylborane and MeOH, the product of the 1,2-addition of PhLi to pyridine transforms to trans-2-allyl-6-phenyl-1,2,3,6-tetrahydropyridine. The structure of its hydrochloride was established by X-ray structural analysis.
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作者:L. M. Korotayeva、T. Ya. Rubinskaya、E. V. Klimkina、V. P. Gultyai、Yu. N. Bubnov
DOI:10.1023/a:1009580110623
日期:——
Electrochemical reduction of trans-2-allyl-6-R-1,2,3,6-tetrahydropyridines (R = Me, All, and Ph) on the mercury cathode in anhydrous DMF (with 0.1 M Bu4NClO4 as the supporting electrolyte) resulted in catalytic hydrogen evolution, while in the case of anhydrous DMF the electrochemical activity of the endocyclic double bond was dictated by the nature of the R substituent at the carbon atom neighboring the double bond. The electrocatalytic hydrogenation of the piperideines under study on the Ni (Ni-disp/Ni) cathode in 40%; aqueous DMF in the presence of a tenfold excess of AcOH yielded the corresponding trans-2-propyl-6-R-1 piperidines (R-1 = Me, Pr, acid Ph). Using trans-2,6-diallyl-1,2,3,6-tetrahydropyridine as an example, the conditions (with annealed copper as the cathode) for selective hydrogenation of the double bonds in allyl substituents with preservation of the endocyclic double bond were found.
作者:L. M. Korotayeva、T. Ya. Rubinskaya、E. V. Klimkina、V. P. Gultyai、Yu. N. Bubnov
DOI:10.1007/bf02496263
日期:1999.4
Electrocatalytic hydrogenation of trans-2-allyl-6-phenyl-1,2,3,6-tetrahydropyridine and trans-2-allyl-6-methyl-1,2,3,6-tetrahydropyridine in 40% aqueous DMF in the presence of AcOH on a nickel cathode gave trans-6-phenyl-2-propylpiperidine and trans-2-methyl-6-propylpiperidine ((+/-)-epidihydropinidine), respectively. Direct electroreduction of trans-2-allyl-6-phenyl-1,2,3,6-tetrahydropyridine in anhydrous DMF on a mercury cathode afforded a 7 : 5 mixture of trans- and cis-2-allyl-6-phenylpiperidine. The structure of the latter compound was confirmed by 2D NOESY spectroscopy. The possible mechanism of formation of the cis-isomer is discussed.