Spectroscopy and crystal structure of anabasine salts
摘要:
The anabasinium hydrochloride, hydriodide and perchlorate were characterized by IR and NMR spectroscopy as well as by X-ray diffraction. Anabasinium hydrochloride crystallizes with three independent ionic pairs in the asymmetric part of the orthorhombic unit cell, while anabasinium hydriodide and perchlorate crystals, being isostructural, are hexagonal and contain only one symmetry independent ionic pair. Despite these differences in the crystal data, both types of crystals display very similar helical solid-state patterns. The reported results combined with the CSD searches indicate an inherent tendency of anabasinium salts to crystallize with multiple asymmetric units, and to form folded arrangements in crystals. In the solid state the anabasinium cations predominantly adopt either synperiplanar or antiperiplanar conformations with respect to the mutual orientation of C*-H and pyridine C-C(N) bonds, with deformations towards, respectively, (+) synclinal or (+) anticlinal rotamers. (C) 2006 Elsevier B.V. All rights reserved.
Aldimines of 2,3,4,6-tetra-0-pivaloyl-β-D-galactosylamine react with 1-methoxy-3-trimethylsilyloxybuta-1,3-diene in a Mannich-Michael condensation reaction sequence to give 2-substituted N-galactosyl-5,6-dehydropiperidin-4-ones 3 with high diastereoselectivity. The X-ray analysis of the 2-propyl derivative 3a proved (R)-configuration of the major diastereomer and led to the correction of our earlier assignment of configuration for (-)-coniine hydrochloride 9a obtained from this intermediate. Despite their low reactivity, these enaminones 3 can be converted into chiral 2,6-cis-disubstituted piperidinones 12 with high stereoselectivity by reaction with organocuprates in combination with hard electrophiles. Enantiomerically pure alkaloids such as (-)-dihydropinidine and gephyrotoxine 167B have been synthesized according to this methodology.
作者:N. M. Slyn’ko、L. E. Tatarova、M. M. Shakirov、E. E. Shul’ts
DOI:10.1007/s10600-013-0585-1
日期:2013.5
N-Aryloxyalkylanabasine derivatives were prepared via the reaction of anabasine hydrochloride with various aryloxyhaloalkanes in the presence of potash in DMF. The reaction occurred with retention of the chiral center C-(2) of the piperidine group. Side products of bis(aryloxy)ethanes were characterized.
Diastereoselectivity of Azido-Ugi Reaction with Secondary Amines. Stereoselective Synthesis of Tetrazole Derivatives
作者:Danil P. Zarezin、Victor N. Khrustalev、Valentine G. Nenajdenko
DOI:10.1021/acs.joc.7b00611
日期:2017.6.16
diastereoselectivity of azido-Ugi reaction with cyclic amines was investigated. It was found that the reaction with α-substituted five- to seven-membered cyclic amines proceeds very efficiently to provide high control of diastereoselectivity (≤100% de) under mild conditions. Target tetrazole-derived products were isolated in excellent yields (≤98%). The reaction has a broad scope in terms of its amine, aldehyde, and
Synthesis of N-Derivatives of Cytisine, Anabasine, and Salsoline Alkaloids with Pharmacophore 3-Aminopyridine-2(1H)-one and 5-Methyl-7-phenyloxazole[5,4-b]pyridine Cycles
作者:I. V. Palamarchuk、D. N. Ogurtsova、T. M. Seilkhanov、I. V. Kulakov
DOI:10.1134/s1070363219120259
日期:2019.12
reaction of nucleophilic substitution of 2-chloro-N-(6-methyl-2-oxo-4-phenyl-1,2-dihydropyridin-3-yl)acetamide and 2-(chloromethyl)-5-methyl-7-phenyloxazolo[5,4-b]pyridine with cytisine, anabasine, and salsoline alkaloids has afforded the corresponding derivatives. Structure of the obtained compounds has been confirmed by means of 1H and 13C NMR spectroscopy.
2-氯-N-(6-甲基-2-氧代-4-苯基-1,2-二氢吡啶-3-基)乙酰胺与2-(氯甲基)-5-甲基-7-苯基恶唑的亲核取代反应[5,4- b ]吡啶与胞嘧啶碱,金刚烷胺和索索林生物碱已提供相应的衍生物。所获得的化合物的结构已经通过1 H和13 C NMR光谱法确认。
Isoprenoid derivatives of N-propargylanabasine: mild hydration of a trisubstituted double bond
作者:M. V. Mavrov、S. G. Zlotin
DOI:10.1007/s10593-009-0330-7
日期:2009.6
iperidine has been synthesi-zed by the three-component condensation of (S)-anabasine with (2-cyanoethoxy)dehydrolinalool and formaldehyde. A series of previously unreported N-propargylanabasine derivatives has been synthesized from this compound.