Diisopropylamine → HCID 66937209, compound

Participants

Reaction Steps

To a solution of diisopropylamine (260 L, 1.85 mmol) in dry THF (2 mL) cooled in −78° C. bath was added n-buthyllithium in hexanes (1.16 mL of a 1.6 M solution). After 45 min, the contents of the flask were added via syringe to a −78° C. solution of 6-chloro-1-(2-methoxy-ethoxymethyl)-5-phenoxy-1H-benzoimidazole (0.560 g, 1.68 mmol) in dry THF (2 mL). After 60 min, N-chlorosuccinimide (0.247 g, 1.85 mmol) in THF (3 mL) was added via syringe to the dark solution at which time the color changed to light brown. The reaction mixture was allowed to warm to ambient temperature then was added to saturated aq. NH4Cl and extracted with EtOAc. The combined organic layers were washed with 0.5 M citric acid, 5% aq. NaHCO3, brine, dried, filtered, and concentrated under reduced pressure. The residue was purified (FCC) to yield the titled compound as a mixture of regioisomers (0.251 g, 41%; orange oil). MS (ESI/CI): mass calcd. for C17H16Cl2N2O3, 366; m/z found, 367 [M+H]+. 1H NMR (400 MHz, CDCl3) δ 7.80 (s, 1H), 7.62 (s, 1H), 7.37 (s, 1H), 7.36-7.29 (m, 4H), 7.18 (s, 1H), 7.14-7.04 (m, 2H), 6.98-6.90 (m, 4H), 5.63 (s, 2H), 5.54 (s, 2H), 3.72-3.63 (m, 2H), 3.63-3.57 (m, 2H), 3.57-3.50 (m, 2H), 3.49-3.42 (m, 2H), 3.38 (s, 3H), 3.28 (s, 3H).

Provenance & Evidence