Dicyclohexylcarbodiimide → HCID 58556939, compound

Participants

Reaction Steps

2-(Phenylamino)-2-(thiophen-2-yl)acetic acid hydrochloride (I29) (359 mg, 1.33 mmol), DCC (330 mg, 1.60 mmol), and HOBT (245 mg, 1.60 mmol) were dissolved in THF (15 ml). (R)-quinuclidin-3-ol (339 mg, 2.66 mmol) was added, and the reaction mixture was stirred at room temperature for 16 hours. HOBT (20.4 mg, 0.13 mmol) and DCC (33.0 mg, 0.16 mmol) were added again and the mixture was stirred for additional 8 hours. HOBT (20.4 mg, 0.13 mmol), DCC (33.0 mg, 0.16 mmol), (R)-quinuclidin-3-ol (16.9 mg, 0.13 mmol) were added, and the mixture is stirred for additional 16 hours. THF is evaporated, and the resulting crude oil was dissolved in EtOAc and washed with water and brine. The organic phase was recovered, dried over Na2SO4, filtered and evaporated. The crude was first purified by flash chromatography (DCM/MeOH=9/1) and then by preparative HPLC. The pure fractions were collected and evaporated. The resulting TFA salt was dissolved in THF and passed through a PL-HCO3 cartridge (Varian, 200 mg, 1.8 mmol/g HCO3−). THF was evaporated, and the product was dissolved in dioxane (2 ml) and 4M HCl in dioxane (2 ml) was added. The solvent was evaporated, and the residue was dried under vacuum for 24 hours to obtain the title compound (33 mg, 7% yield, mixture of diastereomers).

Provenance & Evidence