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Kurskova AO, Dotsenko VV, Frolov KA, Aksenov NA, Aksenova IV, Krivokolysko BS, Peresypkina AA, Chigorina EA, Krivokolysko SG. Synthesis and Aminomethylation of 2-Amino-4-(2-chlorophenyl)-6-(dicyanomethyl)-1,4-dihydropyridine-3,5-dicarbonitrile N-Methylmorpholinium Salt. RUSS J GEN CHEM+ 2022; 92:779-790. [PMID: 35729943 PMCID: PMC9197094 DOI: 10.1134/s1070363222050061] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2022] [Revised: 02/15/2022] [Accepted: 02/17/2022] [Indexed: 12/01/2022]
Abstract
Sequential reaction of 2-chlorobenzaldehyde, cyanothioacetamide, and malononitrile dimer in the presence of an excess of N-methylmorpholine resulted in the formation of N-methylmorphlinium salt of 2-amino-4-(2-chlorophenyl)-6-(dicyanomethyl)-1,4-dihydropyridine-3,5-dicarbonitrile. The resulting salt reacts under Mannich conditions with primary amines and an excess of formaldehyde to form substituted 2-alkylamino-4-(dicyanomethylene)-3,7-diazabicyclo[3.3.1]non-2-ene-1,5-dicarbonitriles. Structure of the key compound was confirmed by single crystal X-ray diffraction analysis.
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Affiliation(s)
- A O Kurskova
- ChemEx Laboratory, V. Dahl Lugansk State University, 91034 Lugansk, Ukraine
| | - V V Dotsenko
- Kuban State University, 350040 Krasnodar, Russia.,North Caucasian Federal University, 355009 Stavropol, Russia
| | - K A Frolov
- ChemEx Laboratory, V. Dahl Lugansk State University, 91034 Lugansk, Ukraine
| | - N A Aksenov
- North Caucasian Federal University, 355009 Stavropol, Russia
| | - I V Aksenova
- North Caucasian Federal University, 355009 Stavropol, Russia
| | - B S Krivokolysko
- Lugansk State Medical University named after St. Luke, 91045 Lugansk, Ukraine
| | - A A Peresypkina
- Belgorod State National Research University, 308015 Belgorod, Russia
| | - E A Chigorina
- National Research Center "Kurchatov Institute" - IREA, 107076 Moscow, Russia.,National Research Center "Kurchatov Institute", 123182 Moscow, Russia
| | - S G Krivokolysko
- ChemEx Laboratory, V. Dahl Lugansk State University, 91034 Lugansk, Ukraine.,Lugansk State Medical University named after St. Luke, 91045 Lugansk, Ukraine
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Krut’ko DP, Medved’ko AV, Lyssenko KA, Churakov AV, Dalinger AI, Kalinin MA, Gudovannyy AO, Ponomarev KY, Suslov EV, Vatsadze SZ. Bispidine Platform as a Tool for Studying Amide Configuration Stability. Molecules 2022; 27:430. [PMID: 35056748 PMCID: PMC8779339 DOI: 10.3390/molecules27020430] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2021] [Revised: 12/24/2021] [Accepted: 01/05/2022] [Indexed: 11/17/2022] Open
Abstract
In this work, the solution conformations of seventeen 3,7-diacyl bispidines were studied by means of NMR spectroscopy including VT NMR experiments. The acyl groups included alkyl, alkenyl, aryl, hetaryl, and ferrocene moieties. The presence of syn/anti-isomers and their ratios were estimated, and some reasons explaining experimental facts were formulated. In particular, all aliphatic and heterocyclic units in the acylic R(CO) fragments led to an increased content of the syn-form in DMSO-d6 solutions. In contrast, only the anti-form was detected in DMSO-d6 and CDCl3 in the case when R = Ph, ferrocenyl, (R)-myrtenyl. In the case of a chiral compound derived from the natural terpene myrtene, a new dynamic process was found in addition to the expected inversion around the amide N-C(O) bond. Here, rotation around the CO-C=C bond in the acylic R fragment was detected, and its energy was estimated. For this compound, ΔG for amide N-C(O) inversion was found to be equal to 15.0 ± 0.2 kcal/mol, and for the rotation around the N(CO)-C2' bond, it was equal to 15.6 ± 0.3 kcal/mol. NMR analysis of the chiral bispidine-based bis-amide was conducted for the first time. Two X-ray structures are reported. For the first time, the unique syn-form was found in the crystal of an acyclic bispidine-based bis-amide. Quantum chemical calculations revealed the unexpected mechanism for amide bond inversion. It was found that the reaction does not proceed as direct N-C(O) bond inversion in the double-chair (CC) conformation but rather requires the conformational transformation into the chair-boat (CB) form first. The amide bond inversion in the latter requires less energy than in the CC form.
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Affiliation(s)
- Dmitry P. Krut’ko
- Chemistry Department, Lomonosov Moscow State University, Leninskie Gory, 119991 Moscow, Russia; (D.P.K.); (K.A.L.); (A.I.D.); (M.A.K.); (A.O.G.)
| | | | - Konstantin A. Lyssenko
- Chemistry Department, Lomonosov Moscow State University, Leninskie Gory, 119991 Moscow, Russia; (D.P.K.); (K.A.L.); (A.I.D.); (M.A.K.); (A.O.G.)
| | - Andrei V. Churakov
- N.S. Kurnakov Institute of General and Inorganic Chemistry, 119991 Moscow, Russia;
| | - Alexander I. Dalinger
- Chemistry Department, Lomonosov Moscow State University, Leninskie Gory, 119991 Moscow, Russia; (D.P.K.); (K.A.L.); (A.I.D.); (M.A.K.); (A.O.G.)
| | - Mikhail A. Kalinin
- Chemistry Department, Lomonosov Moscow State University, Leninskie Gory, 119991 Moscow, Russia; (D.P.K.); (K.A.L.); (A.I.D.); (M.A.K.); (A.O.G.)
- Zelinsky Institute of Organic Chemistry, 119991 Moscow, Russia;
| | - Alexey O. Gudovannyy
- Chemistry Department, Lomonosov Moscow State University, Leninskie Gory, 119991 Moscow, Russia; (D.P.K.); (K.A.L.); (A.I.D.); (M.A.K.); (A.O.G.)
- High Chemical College, Mendeleev University of Chemical Technology of Russia, 125047 Moscow, Russia
| | - Konstantin Y. Ponomarev
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, 630090 Novosibirsk, Russia; (K.Y.P.); (E.V.S.)
| | - Eugeny V. Suslov
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, 630090 Novosibirsk, Russia; (K.Y.P.); (E.V.S.)
| | - Sergey Z. Vatsadze
- Chemistry Department, Lomonosov Moscow State University, Leninskie Gory, 119991 Moscow, Russia; (D.P.K.); (K.A.L.); (A.I.D.); (M.A.K.); (A.O.G.)
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