Sodium Sulfite → HCID 19894055, compound

Participants

Reaction Steps

A solution of m-chloroperbenzoic acid (0.156g, 0.001 mol) in dichloromethane (5mL) was added to a solution of 3-[6-(4-methylthiazol-2-yl) thiohexyloxy-carbonyl]-5-methoxycarbonyl-2,6-dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine (18) (0.545 g, 0.001 mol) in dichloromethane (10 mL) at room temperature with agitation. Stirring under the same conditions was maintained for 2 h. The excess peracid was decomposed by 10% solution of sodium sulfite. The organic layer was separated and washed with 5% sodium bicarbonate solution in order to extract m-chlorobenzoic acid, followed by washing with water and drying over anhydrous sodium sulfate. The solvent was removed under reduced pressure, and the residual oil was purified by elution from a silica gel column using chloroform-hexane (8:2, v/v) as eluant to give 3-[6-(4-methylthiazol-2-yl)sulfinylhexyloxycarbonyl]-5-methoxycarbonyl-2,6-dimethyl-4-(3- nitrophenyl)-1,4-dihydropyridine (65%) as colorless prisms, mp 81°-83° C. IR (KBr) 3365 (NH) 1695 and 1652 (CO2R) 1033 (SO)cm-1, NMR (CDCl3) 1.22-1.74 (m, 8H, (CH2)4), 2.36 (S, 6H, Me-2, Me-6) 2.52 (S, 3H, Me-HEt),3.02-3.22 (m, 2H, CH2 --SO), 3.68 (S, 3H, CO2Me), 3.96-4.14 (m, 2H, CH2 --O), 5.12 (S, 1H, H-4), 6.56 (S, 1H, H-HEt), 7.26 (S, 1H, NH), 7.38-8.14 (m, 4H, H-2', H-4', H-5', H-6'). Analysis found: C, 55.75; H, 5.64; N, 7.35; S, 11.30. Required: C, 55.66; H, 5.56; N, 7.48; S, 11.42 (C26H31N3O7S2). ##STR7##

Provenance & Evidence