反应 #3711990
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openreactiondata ↗doi:10.6084/m9.figshare.5104873.v1; patent:US05164388
反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.
实验步骤: Following the procedure of Cohen (J. Am. Chem. Soc., 1964, 86, 5326), the resultant compound from Example 89 (8.6 g, 52 mmol) was dissolved in dry methanol (250 ml). p-Toluenesulfonic acid (2 g, 10.5 mmol) was added and the solution was refluxed for 2 h. The cooled solution was concentrated in vacuo and the residue was dissolved in ether (400 ml). The ether solution was washed with saturated aqueous NaHCO3 (3×50 ml), water (2×50 ml), 0.1N H2SO4 (1×50 ml), water (1×50 ml), dried over Na2SO4, and concentrated in vacuo to afford a colorless solid. The solid was recrystallized from hexane to provide the title compound as colorless needles (7.7 g, 83%); mp=46°-47° C. the solution was refluxed for 2 h The cooled solution was concentrated in vacuo the residue was dissolved in ether (400 ml) The ether solution was washed with saturated aqueous NaHCO3 (3×50 ml), water (2×50 ml), 0.1N H2SO4 (1×50 ml), water (1×50 ml) dried over Na2SO4 concentrated in vacuo to afford a colorless solid The solid was recrystallized from hexane
来源 ID: ord-cc462f2da86b4ab7a825298237e97d91