Ethyl Acrylate → 1,2-Diethyl (1R,2R)-1,2-cyclopropanedicarboxylate

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Ethyl acrylate (99%, 270 g, 1.4 eq.) was added to a solution of 2 (282 g, 1.91 mol) in CHCl3 (1500 mL) at 5° C. Cooling was removed and the reaction was stirred at 22° C. for 12 h. Evaporation of the solvent and excess acrylate left an orange oil, which was vacuum distilled (bp 70-75° C./1 mm) to produce 3 (286 g, 80.6%) as a clear thick oil. 1H NMR (250 MHz, CDCl3) δ4.15 (q, J=7.1, 4H); 2.16 (dd, J=7.5, 5.7, 2H); 1.41 (dd, J=7.5, 5.7, 2H); 0.88 (t, J=7.1, 6H). 13C NMR (62.5 MHz, CDCl3) δ171.69; 60.96; 22.26; 15.18; 14.08.

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