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General Procedure for the Synthesis of 5 and 7: A mixture of 5-alkyl-/5,6-dialkyl-3-cyano-4-methylsulfanyl-2H-pyran-2-ones 3 or 6-isopropyl-4-sec-amino-2H-pyran-2-ones 6 (1 mmol, malononitrile (1.2 mmol) and powdered KOH (1.2 mmol) in anhyd DMF (5 mL) was stirred at r.t. for 8-12 h. After completion of the reaction, the reaction mixture was poured into ice-water with vigorous stirring and finally neutralized with dilute HCl. The solid thus obtained was filtered and purified on a neutral alumina column using CHCl3-hexane (1:9) as eluent. 5a: yield: 89, white solid; mp 236-238°C. 1H NMR (200 MHz, CDCl 3, δ, 2.48 (s, 3 H, Me, 2.54 (s, 3 H, SMe, 5.10 (br s, 2 H, NH2, 6.42 (s, 1 H, ArH, 13C NMR (50.0 MHz, CDCl 3, DMSO, δ, 19.95, 26.68, 96.73, 98.40, 118.95, 119.83, 120.87, 152.67, 155.72, 158.00. IR (KBr, 2213 (CN, 3353, 3442 (NH2) cm
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4O: 270.1481; found: 270.1483.
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General Procedure for the Synthesis of 6: A mixture of compound 3d (1.0 mmol) and secondary amine (1.2 mmol) was refluxed in MeOH (20 mL) for 6-8 h. After completion of the reaction, MeOH was evaporated under vacuum, and the reaction mixture was washed with ice-cooled H2O. The crude was purified on a silica gel column using CHCl3 as eluent. 6a: yield 74, white solid; mp 162-164°C. 1H NMR (200 MHz, CDCl 3, δ, 1.23 (d, J, 6.8 Hz, 6 H, 2 x Me, 2.00-2.10 (m, 4 H, 2 x CH2, 2.62-2.73 (m, 1 H, CH, 3.54-3.62 (m, 2 H, CH 2, 4.02-4.10 (m, 2 H, CH2, 5.71 (s, 1 H, CH, 13C NMR (75.5 MHz, CDCl3, δ, 20.36, 34.00, 49.89, 66.99, 73.24, 94.52, 117.63, 161.92, 163.11, 172.59. IR (KBr, 1704 (CO, 2207 (CN) cm-1. MS ESI, m/z, 249 [M, 1
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+ + 1].
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