Cornforth reagent → HCID 11427434, compound

Participants

Reaction Steps

A mixture of ethyl 12-hydroxy-2,2,11,11-tetramethyl-7-oxo-dodecanoate (3.26 g, 10 mmol) and pyridinium dichromate (14.0 g, 36 mmol) in DMF (45 mL) was stirred at room temperature for 46 h. The solution was diluted with 48% aqueous sulfuric acid (30 mL) and water (300 mL). The product was extracted with ethyl acetate (5×100 mL). The combined organic layers were washed with saturated NaCl solution (5×100 mL), dried over MgSO4, and concentrated to give the crude product (3.19 g) as a green oil. The crude product (3.1 g) was subjected to column chromatography on silica gel eluting with hexanes/ethyl acetate (3:1, then 2:1) to give pure 2,2,11,11-tetramethyl-7-oxo-dodecanedioic acid 1-ethyl ester (2.69 g, 82%) as a pale yellow oil. 1H NMR (300 MHz, CDCl3/TMS): δ (ppm): 11.30 (br. s, 1H), 4.10 (q, 2H, J=7.2 Hz), 2.39 (t, 4H, J=7.2 Hz), 1.56-1.48 (m, 8H), 1.24 (t, 5H, J=7.2 Hz), 1.20 (s, 6H), 1.15 (s, 6H). 13C NMR (75 MHz, CDCl3/TMS): δ (ppm): 210.9, 184.4, 178.1, 60.4, 43.1, 42.7, 42.2, 40.5, 39.8, 25.3, 25.0, 24.7, 24.3, 19.3, 14.4. HRMS (LSIMS, gly): Calcd. for C18H33O5 (MH+): 329.2328. found: 329.2330.

Provenance & Evidence