Triethylamine → 1,1-Dimethylethyl 5-(4-biphenylyl)-3-({[4-(methyloxy)phenyl]methyl}oxy)-2-{2-[(methylsulfonyl) oxy]ethyl}pentanoate

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Reaction Steps

Methanesulfonyl chloride (64 μL, 0.83 mmol) was added in one portion to a stirred solution of 1,1-dimethylethyl 5-(4-biphenylyl)-2-(2-hydroxyethyl)-3-({[4-(methyloxy)phenyl]methyl}oxy)pentanoate (368 mg, 0.751 mmol) and triethylamine (15.4 mg, 209 μL, 1.52 mmol) in dichloromethane (2 mL) at room temperature under nitrogen. After stirring at room temperature for 1 h the crude mixture was partitioned between saturated aqueous citric acid solution (20 mL) and dichloromethane (20 mL). The phases were separated and the organic layer was evaporated to give the title compound (409 mg, 79%) as a yellow oil which was a mixture of diastereomers. LC/MS: 4.08 min; z/e 586, calcd (M+1) 586. 1H NMR (400 MHz: CDCl3): 7.50 (6H), 7.25 (4H), 7.15 (1H), 6.90 (2H), 4.50 (2H), 4.25 (2H), 3.80 (3H), 3.75 (1H), 2.95 (3H), 2.90-2.50 (3H), 2.05 (2H), 1.95-1.65 (2H), 1.55-1.35 (9H).

Provenance & Evidence