Synlett 2016; 27(11): 1669-1673
DOI: 10.1055/s-0035-1561429
letter
© Georg Thieme Verlag Stuttgart · New York

An Unexpected Diastereoselective Synthesis of Novel Substituted Pyridines via One-Pot, Four-Component Reaction

Mahdieh Zangouei
a   Department of Chemistry, Ferdowsi University of Mashhad, Mashhad 917751436, Iran   Email: abesmaeili@um.ac.ir
,
Abbas Ali Esmaeili*
a   Department of Chemistry, Ferdowsi University of Mashhad, Mashhad 917751436, Iran   Email: abesmaeili@um.ac.ir
,
Joel T. Mague
b   Department of Chemistry, Tulane University, New Orleans, LA 70118, USA
› Author Affiliations
Further Information

Publication History

Received: 19 January 2016

Accepted after revision: 18 March 2016

Publication Date:
13 April 2016 (online)


Abstract

An efficient diastereoselective approach for the preparation of novel substituted pyridines has been developed through a one-pot, four-component reaction of easily available aromatic aldehydes, malononitrile, and 6,8-dimethyl-2-hydroxy-4H-pyrimido[1,2-a]pyrimidine-4-one, in appropriate alcohols at reflux in the presence of diisopropylethylamine (DIPEA) as organic base catalyst. Unexpected products were obtained in high to excellent yields using a simple workup procedure. The products synthesized showed high diastereoselectivity, and the stereochemistry was confirmed by X-ray diffraction analysis.

Supporting Information

 
  • References and Notes

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  • 25 General Procedure for the Synthesis of 4 A mixture of aromatic aldehyde (1, 1 mmol), malononitrile (2, 1 mmol, 660 mg), 6,8-dimethyl-2-hydroxy-4H-pyrimido[1,2-a]pyrimidin-4-one (3, 1 mmol, 192 mg), and DIPEA (5 mol%) was heated to reflux in the requisite alcohol (6 mL) for 2 h (the progress of the reaction was monitored by TLC). After completion of reaction, the mixture was allowed to cool to room temperature, and the precipitate was filtered off and washed with cold alcohol to afford the pure alkyl 6-amino-5-cyano-2-oxo-4-phenyl-1-pyrimidin-2-yl-1,2,3,4-tetrahydropyridine-3-carboxylate 4 (yields 85–95%). Representative Analytical Data Ethyl 6-Amino-5-cyano-1-(4,6-dimethylpyrimidin-2-yl)-2-oxo-4-phenyl-1,2,3,4-tetrahydropyridine-3-carboxylate (4a) White powder, 355 mg (91%); mp 207 °C; Rf = 0.52 (n-hexane–EtOAc, 1:1.5). IR (KBr): ν = 3448, 3324 (NH2), 2195 (CN), 1743, 1721 (2 C=O), 1653 (C=N) cm–1. 1H NMR (300 MHz, CDCl3): δ = 1.19 (t, 3 H, J = 7.0 Hz,OCH2CH 3), 2.54 (s, 6 H, 2 CH3), 3.85 (d, 1 H, J = 7.7 Hz, CHC=O), 4.15–4.20 (m, 2 H, OCH 2CH3), 4.34 (d, 1 H, J = 7.7 Hz, CHAr), 4.91 (s, 2 H, NH2), 7.10 (s, 1 H, CH=CCH3), 7.26–7.38 (m, 5 H, HAr). 13C NMR (75 MHz, CDCl3): δ = 13.98 (OCH2 CH3), 23.84 (2 CH3), 40.28 (CHPh), 56.64 (CHC=O), 62.02 (CCN), 63.41 (CH2O), 119.16 (C≡N), 120.42 (CHAr), 127.65 (2 CH ortho ), 128.04 (CH para ), 129.02 (2 CH meta ), 138.38 (CAr), 152.20 (CNH2), 155.16 (NC=N), 165.43 (C=O), 167.05 (C=O), 170.07 (2 CCH3). MS: m/z (%) = 391 (4) [M+], 378 (69), 358 (64), 341 (18), 313 (100), 258 (68), 271 (63), 233 (62). 211 (48), 198 (63), 164 (65), 122 (66), 106 (71), 81 (61), 67 (70), 42 (64), 29 (65). Anal. Calcd for C21H21N5O3: C, 64.44; H, 5.41; N, 17.89. Found: C, 63.99; H, 5.39; N, 17.83. Ethyl 6-Amino-5-cyano-1-(4,6-dimethylpyrimidine-2-yl)-4-(3-nitrophenyl)-2-oxo-1,2,3,4-tetrahydropyridine-3-carboxylate(4b) White powder, 409 mg (94%); mp 211–212 °C; Rf = 0.40 (n-hexane–EtOAc, 1:1.5). IR (KBr): ν = 3452, 3350 (NH2), 2185 (CN), 1747, 1717 (2 C=O), 1632 (C=N) cm–1. 1H NMR (300 MHz, CDCl3): δ = 1.24 (t, 3 H, J = 4.5 Hz, OCH2CH 3), 2.56 (s, 6 H, 2 CH3), 3.82 (d, 1 H, J = 7.79 Hz, CHC=O), 4.21–4.25 (m, 2 H, OCH 2CH3), 4.46 (d, 1 H, J = 7.79 Hz, CHAr), 5.11 (s, 2 H, NH2), 7.12 (s, 1 H, CH=CCH3), 7.26–8.31 (m, 4 H, HAr). 13C NMR (75 MHz, CDCl3): δ = 14.02 (OCH2 CH3), 23.81 (2 CH3), 40.15 (CHPh), 56.51 (CHC=O), 61.25 (CCN), 62.50 (CH2O), 118.81 (C≡N), 120.60 (CHAr), 122.74 (CH ortho ), 123.244 (CH para ), 130.16 (CH meta ), 134.12 (CH ortho ), 140.83 (NC=N), 148.69 (CAr), 153.05 (CNH2), 154.99 (CNO2), 164.60 (C=O), 166.48 (C=O), 170.27 (2 CCH3). MS: m/z (%) = 436 (14) [M+], 422 (72), 393 (71), 346 (100), 318 (71), 304 (69), 241 (42), 212 (32), 199 (72), 150 (71), 123 (73), 107 (74), 82 (50), 67 (72), 29 (74). Anal. Calcd for C21H20N6O5: C, 57.79; H, 4.62; N, 17.26. Found: C, 57.62; H, 4.27; N, 16.95.