Tetrahydrofuran → HCID 178484162, compound

Participants

Reaction Steps

A 1000 mL 2 or 3 neck round-bottomed flask with reflux condenser was charged with anhydrous InCl3 (12.1 g, 40.5 mmol) and dried under vacuum with a heat gun. After the flask cooled to ambient temperature and was flushed with argon, anhydrous THF (240 mL) was added. The solution was cooled to −78° C. and c-PrMgBr (244 mL, 122 mmol) as a 0.5 M solution in THF was added. After 15 minutes, the solution was allowed to slowly warm to room temperature to form a clear heterogeneous solution. To the reaction flask was added 7-iodosancycline (19.4 g, 36.0 mmol) and Pd(t-Bu3)2 (0.920 g, 1.80 mmol). The solution was heated to reflux under argon until complete (approximately 1 hour). After cooling to ambient temperature, the solution was quenched with MeOH (1 mL) and poured into a stirring cold solution of 1M HCl (3 L). After 1 hour, the solution was filtered through a pad of Celite, while rinsing with water. The water solution was loaded onto a DVB column for solid phase extraction and the product was isolated by eluting with 1% TFA/CH3CN. The crude product was further purified by preparatory HPLC (C18, linear gradient 20-60% acetonitrile in water with 0.1% TFA, to afford 11.8 g in 72% yield as a yellow solid. 1H NMR (CD3OD) δ 7.18 (d, J=7.4 Hz, 1 H), 6.61 (d, J=7.4 Hz, 1 H), 3.99 (s, 1 H), 3.34 (dd, J=9.1, 2.8 Hz, 1 H), 3.05-2.84 (m, 10 H), 2.32-2.09 (m, 2 H), 0.86-0.75 (m, 2 H), 0.51-0.37 (m, 2 H). LC/MS (MH+) 455.

Provenance & Evidence