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General Experimental Procedure A mixture of Baylis-Hillman adduct (1 mmol, DMP (1.2 mmol, and pyridine (1.5 mmol) in anhyd CH2Cl 2 (10 mL) was stirred at r.t. until complete oxidation took place. To this, trimethylsilyl enol ether (1.5 mmol) was added and stirred until complete addition (as indicated by TLC) took place. The reaction mixture was diluted with H2O (50 mL) and extracted with Et2O (3 x 15 mL, The combined ether layer was washed with sat. aq NaHCO3 soln (1 x 15 mL, brine (1 x 10 mL, dried over Na2SO4, and evaporated. The crude product was purified by silica gel column chromatography using a gradient mixture of hexane-EtOAc (9:1) as eluent to afford pure substituted dihydropyran derivatives. Spectral Data of Selected Compounds Compound 3a (Table 1, colorless liquid. IR KBr, νmax, 2954, 2838, 1738, 1454, 1234, 1207, 1153, 1017, 781 cm-1. 1H NM
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4NaCl: 367.0713; found: 367.0715.
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