Triethylamine → 1-Methanesulfonyloxymethyl-cyclopropanecarboxylic acid ethyl ester

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Triethylamine (5.57 mL, 40.00 mmol) and methanesulfonyl chloride (2.85 mL, 36.60 mmol) were sequentially added to a stirred solution of ethyl 1-(hydroxymethyl)cyclopropanecarboxylate (4.80 g, 33.30 mmol) in dichloromethane (83 mL) at 23° C. The resulting bright yellow solution was stirred at 23° C. for 20 h. The reaction mixture was diluted with water and extracted with dichloromethane. The combined organic layers were dried (MgSO4), filtered, and concentrated to dryness to give the desired product as a brown oil (6.92 g, 94%): 1H NMR (300 MHz, CDCl3) δ 4.33 (s, 2H), 4.16 (q, J=7 Hz, 2H), 3.08 (s, 3H), 1.43 (dd, J=7, 4 Hz, 2H), 1.26 (t, J=7 Hz, 3H), 1.04 (dd, J=7, 4 Hz, 2H).

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