Diethyl Ether → HCID 68183080, compound

Participants

Reaction Steps

In a 100 mL round bottomed flask were placed 5,5-dimethyl-2-pyridin-4-yl-6,7-dihydro-1-benzothiophen-4(5H)-one (380 mg, 1.5 mmol) and THF (30 mL). To the mixture was added a solution of 4-chlorophenylmagnesium bromide in ether (1.0 M, 3.5 mL, 3.5 mmol) then the reaction was stirred for 3 hr at rt. LCMS indicated that starting material still remained, so additional 4-chlorophenylmagnesium bromide in ether (1.0M, 2.5 mL, 2.5 mmol) was added and the reaction was stirred for 16 hr at rt then for 10 hr at 70° C. The mixture was allowed to cool to rt then additional 4-chlorophenylmagnesium bromide in ether (1.0M, 5 mL, 5 mmol) was added and the mixture was stirred for 16 hr at rt. The mixture was then diluted with a saturated aqueous solution of NH4Cl (50 mL) and was extracted with EtOAc (50 mL×2). The combined organic phases were dried over anhydrous MgSO4. The insoluble materials were removed by filtration and the filtrate was concentrated under reduced pressure. The residue was purified using column chromatography on silica gel (24 g RediSep column, gradient 30% EA in hexane to 100% EA in hexane) to give the product (530 mg; 97%) as a colorless foam: 1H NMR (400 MHz, DMSO-d6) δ: 8.48 (dd, 2H), 7.45 (dd, 2H), 7.32-7.35 (m, 2H), 7.23-7.25 (m, 3H), 5.55 (s, 1H), 2.87-2.91 (m, 2H), 1.84-1.90 (m, 1H), 1.57-1.63 (m, 1H), 0.91 (s, 3H), 0.63 (s, 3H).

Provenance & Evidence