Tetrahydrofuran → HCID 10245053, compound

Participants

Reaction Steps

The crude 5-allyloxy-1-cyclobutylmethyl-1H-indole from Step 3 was dissolved in 0.5 mL anhydrous THF and 0.22 mL (2.5 mmol) oxalyl chloride was added. The reaction was mixed overnight on an orbital shaker. The reaction was concentrated and the crude product was redissolved in a minimum volume of dichloromethane. 0.8 mL 1N aqueous NaOH was added and the reaction was capped and shaken. The solution was acidified by the dropwise addition of 2N aqueous HCl and extracted with 1.6 mL dichloromethane. LC/MS (see Note 2) indicated that the reaction was not complete. The crude material was redissolved in 0.5 mL anhydrous THF, 0.16 mL oxalyl chloride was added, and the reaction was mixed at 40° C. for 6 hr with orbital shaking. The reaction was worked up as described previously and the crude products were purified by RP-HPLC (see Note 1) to afford 6.2 mg (19.8 μmol) (5-allyloxy-1-cyclobutylmethyl-1H-indol-3-yl)-oxo-acetic acid: LC/MS Data (molecular ion and retention time): m/z 312 (M−H); 2.49 min.

Provenance & Evidence