Boron trifluoride etherate → 6-[2-(5-Ethoxycarbonyl-5-methyl-hexyl)-[1,3]dithian-2-yl)-2,2-dimethyl-hexanoic acid ethyl ester

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Under N2 atmosphere, to a solution of 2,2,12,12-tetramethyl-7-oxo-tridecanedioic acid diethyl ester (1.0 g, 2.70 mmol) and 1,3-propanedithiol (361 mg, 361 μL, 3.24 mmol) in dichloromethane (20 mL; dried with Aluminum oxide, activated, neutral, Brockmann I) was added boron trifluoride diethyl etherate (100 μL) at rt. The reaction mixture was stirred for 3 h, diluted with dichloromethane (100 mL), and extracted with 5% NaOH solution (100 mL) and water (75 mL). The organic phase was dried over MgSO4, concentrated in vacuo, and dried in high vacuo to furnish 6-[2-(5-ethoxycarbonyl-5-methyl-hexyl)-[1,3]dithian-2-yl]-2,2-dimethyl-hexanoic acid ethyl ester (1.0 g, 80%) as a yellowish oil. 1H NMR (300 MHz, CDCl3/TMS): δ (ppm): 4.11 (q, 4H, J=7.1), 2.79 (t, 4H, J=5.6), 1.94 (m, 2H), 1.84 (m, 4H), 1.54 (m, 4H), 1.39 (m, 4H), 1.24 (t, 6H, J=7.1), 1.30-1.20 (m, 4H), 1.16 (s, 12H). 13C NMR (75 MHz, CDCl3/TMS): δ (ppm): 178.08, 60.33, 53.32, 42.27,40.69, 38.28, 26.14, 25.67, 25.28, 24.71, 14.41. HRMS (LSIMS, nba): Calcd. for C24H45S2O4 (MH+): 461.2759, found 461.2774.

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