Iodoethane → Ethoxy[4-(2-hydroxy-4-methylphenyl)-2-methyl-5,6,7,8-tetrahydro[1]benzothieno[2,3-b]pyridin-3-yl]acetic acid

関与物質

反応条件

反応手順

To a stirred solution of [4-(2-Allyloxy-4-methyl-phenyl)-2-methyl-5,6,7,8-tetrahydro-benzo[4,5]thieno[2,3-b]pyridin-3-yl]-hydroxy-acetic acid ethyl ester (100 mg, 221 μmols, 1 eq) in MeCN (5 mL) was added silver oxide (102 mg, 442 μmols, 2 eq) followed by iodoethane (172 mg, 89 uL, 5 eq) and the reaction was stirred for 16 hours at 60° C. Additional iodoethane (1 mL, 50 eq) and silver (I) oxide (102 mg, 2 eq) was added and the reaction was continued to be heated at 60° C. for 16 hours. The reaction was diluted with MeCN (5 mL), and filtered. The filtrate was then concentrated in vacuo. The residue was purified using ISCO Companion with a Redisep silica gel 12 g cartridge and a gradient of heptane and ethyl acetate (0% to 30%). Fractions containing (4-(2-allyloxy-4-methyl-phenyl)-2-methyl-5,6,7,8-tetrahydro-benzo[4,5]thieno[2,3-b]pyridin-3-yl)-ethoxy-acetic acid ethyl ester were combined and concentrated in vacuo to give the desired product as a pale orange oil, 22 mg (22% yield). LC-MS (12 min acidic) 7.55 mins 100% pure by UV, ES+/APCI+ 480.

情報源と証拠