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Synlett 2012; 23(20): 2894-2898
DOI: 10.1055/s-0032-1317543
DOI: 10.1055/s-0032-1317543
letter
An Efficient, One-Pot Regioselective Synthesis of Highly Functionalized Chromen-5-ones and Pyrano[3,2-c]chromen-5-ones via a Tandem Knoevenagel–Michael–Cyclization Sequence
Further Information
Publication History
Received: 21 September 2012
Accepted after revision: 17 October 2012
Publication Date:
16 November 2012 (online)
Abstract
A facile, convenient, efficient, and high-yielding regioselective synthesis of a combinatorial library of hitherto unreported highly functionalized chromen-5-ones and pyrano[3,2-c]chromen-5-ones has been developed by one-pot three-component coupling of substituted aromatic aldehydes, dimedone/4-hydroxycoumarin with NMSM in the presence of catalytic amount of piperidine in ethanol medium. This transformation presumably proceeds via domino Knoevenagel condensation–Michael addition–intermolecular cyclization sequence creating three new bonds (two C–C and one C–O) and one stereocenter in a single operation.
Key words
NMSM - Michael addition - regioselectivity - chromenes and pyranochromenes - one-pot synthesisSupporting Information
- for this article is available online at http://www.thieme-connect.com/ejournals/toc/synlett.
- Supporting Information
-
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- 20 General Procedure for the Synthesis of Tetrahydrochromen-5-one 5a–j: A solution of the requisite aldehyde (1.0 mmol), cyclic 1,3-dicarbonyl compound (1.0 mmol), NMSM (1.0 mmol), and piperidine (0.2 equiv) in EtOH (2 mL) was stirred for the appropriate time (Table 2). After reaction was complete as indicated by TLC, the product was filtered and washed with EtOH (2 mL) to remove the excess base and other impurities. Finally, the products were recrystallized from EtOH.
- 21 General Procedure for the Synthesis of Pyrano[3,2-c]chromen-5-ones 6a–f: A solution of the requisite aldehyde (1.0 mmol), 4-hydroxycoumarin (1.0 mmol), NMSM (1.0 mmol), and piperidine (0.2 equiv) in EtOH (2 mL) was stirred for the appropriate time (Table 3). After reaction was complete as indicated by TLC, the product was filtered and washed with EtOH (2 mL) to remove the excess base and other impurities. Finally, the products were recrystallized from EtOH.
- 22 Crystallographic data for compound 5a in this paper have been deposited with the Cambridge Crystallographic Data Centre as supplemental publication No. CCDC 897843. Copies of the data can be obtained, free of charge on application to CCDC, 12 Union Road, Cambridge CB2 1EZ, UK [fax: +44(1223)336033 or email: deposit@ccdc.cam.ac.uk]. 7,7-Dimethyl-2-(methylamino)-3-nitro-4-(4-nitrophenyl)-7,8-dihydro-4H-chromen-5(6H)-one (5a): white solid; yield: 86%; mp 220–222 °C. IR (KBr): 3203, 2598, 1682, 1637, 1515, 1469, 1357, 1263, 1137, 1056, 825, 694, 632, 544 cm–1. 1H NMR (500 MHz, DMSO-d 6): δ = 0.91 (s, 3 H, Me), 1.06 (s, 3 H, Me), 2.13 (d, J = 16 Hz, 1 H, CH), 2.28 (d, J = 16.5 Hz, 1 H, CH), 2.64 (dd, J = 18 Hz, 2 H, CH2), 3.12 (d, J = 5.5 Hz, 3 H, NMe), 5.0 (s, 1 H, CH), 7.53 (d, J = 9.0 Hz, 2 H, ArH), 8.11 (d, J = 8.5 Hz, 2 H, ArH), 10.28 (q, J = 5.0 Hz, 1 H, D2O exchangeable, NH). 13C NMR (125 MHz, DMSO-d 6): δ = 27.2, 28.8, 28.9, 32.4, 36.6, 39.6, 50.1, 108.1, 114.6, 123.5, 130.1, 146.7, 150.6, 157.6, 162.0, 195.9. ESI–MS: 374 [M+ + 1]. Anal. Calcd for C18H19N3O6: C, 57.90; H, 5.13; N, 11.25. Found: C, 57.96; H, 5.07; N, 11.31. 2-(Methylamino)-3-nitro-4-para-tolylpyrano[3,2-c]chromen-5(4H)-one (6a): white solid; yield: 86%; mp 258–260 °C. IR (KBr): 3211, 2923, 2369, 1728, 1674, 1628, 1359, 1264, 1153, 1110, 948, 807, 771, 689, 530, 438 cm–1. 1H NMR (500 MHz, DMSO-d 6): δ = 2.22 (s, 3 H, Me), 3.22 (d, J = 5.0 Hz, 3 H, NMe), 5.03 (s, 1 H, CH), 7.06 (d, J = 8.0 Hz, 2 H, ArH), 7.21 (d, J = 7.5 Hz, 2 H, ArH), 7.47–7.52 (m, 2 H, ArH), 7.72 (t, J = 7.5 Hz, 1 H, ArH), 8.00 (d, J = 7.5 Hz, 1 H, ArH), 10.39 (d, J = 5.5 Hz, 1 H, D2O exchangeable, NH). 13C NMR (125 MHz, DMSO-d 6): δ = 21.1, 29.2, 37.5, 107.3, 108.3, 113.1, 117.1, 123.3, 125.5, 128.8, 129.1, 133.6, 136.8, 138.8, 152.2, 152.4, 157.2, 159.7. ESI–MS: 365 [M+ + 1]. Anal. Calcd for C20H16N2O5: C, 65.93; H, 4.43; N, 7.69. Found: C, 65.87; H, 4.49; N, 7.74.