Hydrochloric Acid → HCID 11475844, compound

Participants

Reaction Steps

To a solution of 9-isocyano-2,2,16,16-tetramethyl-9-(toluene-4-sulfonyl)-heptadecanedioic acid diethyl ester (12.0 g, 20.3 mmol) in methylene chloride (200 mL) was added concd HCl (47 mL). The reaction mixture was stirred for 80 min at room temperature. The mixture was diluted with water (200 mL), the layers were separated, and the aqueous layer was extracted with methylene chloride (3×70 mL). The combined organic layers were washed with saturated NaHCO3 solution (3×40 mL) and brine (50 mL). The solution was dried over MgSO4, and concentrated in vacuo to yield the crude product (7.52 g). Purification by column chromatography (silica gel, ethyl acetate/hexanes=1/9) gave 2,2,16,16-tetramethyl-9-oxoheptadecanedioic acid diethyl ester (3.5 g, 40%) as a colorless oil. 1H NMR (300 MHz, CDCl3/TMS): δ (ppm): 4.14 (q, J=7.1 Hz, 4 H), 2.41 (t, J=7.0 Hz, 4 H), 1.66-1.35 (m, 20 H), 1.25 (t, J=7.1 Hz, 6 H), 1.17 (s, 12H). 13C NMR (75 MHz, CDCl3/TMS): δ (ppm): 211.24, 177.89, 60.01, 42.69, 42.07, 40.64, 29.86, 29.07, 25.13, 24.73, 23.74, 14.24. HRMS (LSIMS, gly): Calcd for C25H47O5 (MH+): 427.3423, found: 427.3430.

Provenance & Evidence