Sodium Carbonate → HCID 15017687, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of the product of Example 68 (248 mg, 0.49 mmol) in 25 ml of dry DMF was added Na2CO3 (51 mg, 0.49 mmol) and 1-acetoxyethyl bromide (82 mg, 0.49 mmol) at -10° C. The mixture was stirred at 5° C. for 30 min and 82 mg (0.49 mmol) of 1-acetoxyethyl bromide was added to the suspension. After being stirred for 30 min more, the reaction mixture was diluted with AcOEt (50 ml), washed with water (30 ml×3) and brine, dried over MgSO4 and evaporated under diminished pressure. The crude product was purified by silica gel chromatography eluted with 3% MeOH in chloroform. Removal of the solvent from appropriate eluant followed by freeze-drying gave 157 mg (54%) of the title compound, mp 125° C. (dec). IR νmax (KBr) cm-1 3430, 3290, 1770, 1680. UV λmax (pH 7 phosphate buffer) nm (ε) 228 (21900), 287 (12700). 1H NMR (DMSO-d6) δ 1.51 (3H, d, J=6 Hz, 4-COOCHCH3), 2.02 (3H, s, AcO), 2.06 (3H, s, AcO), 2.22 (3H, s, AcO), 3.47 (2H, br.s, 2-H), 4.46 (1H, q, J=6 Hz, 4-COOCHCH3), 4.55 (2H, ABq, CH2OAc), 5.12 (1H, d, J=5 Hz, 6-H), 5.70 (1H, m, 3-CH=CH), 5.95 (1H, dd, J=5 & 7 Hz, 7-H), 6.25 (1H, d, J=12 Hz, 3-CH=CH), 6.92 (1H, s, thiazole).

Provenance & Evidence