Hydrochloric Acid → HCID 178436723, compound

Participants

Reaction Conditions

Reaction Steps

A solution of methyl 4-chloro-3′-fluoro-6-[(E)-pyrrolidin-1-yldiazenyl]-5-[(trimethylsilyl)ethynyl]biphenyl-2-carboxylate (1.0 kg, 2.2 mol) in tetrahydrofuran (3 L) and methanol (0.86 L) was treated with 2.0 M sodium hydroxide in water (3.4 L, 6.7 mol) and heated to 60° C. in 30 minutes and kept at an internal temperature of 60-63° C. for 90 minutes. The reaction mixture was cooled to 1 to 5° C. with an ice bath, treated with 3.0 M hydrogen chloride in water (2.8 L, 8.3 mol) in portions (temperature reached 16° C.) until the pH reached 1-2. The reaction mixture was diluted with ethyl acetate (2 L) and stirred for 20 minutes. The aqueous layer was separated and extracted with ethyl acetate (1 L). The combined organic layers were washed with water (2×3 L) and brine (300 mL), dried over sodium sulfate, filtered, and concentrated to give the desired product as an oil. This material was azeotroped with toluene (1 L) to give the desired product (theoretical yield 830 g) as a dark syrup. This material was used in the next step without further purification.

Provenance & Evidence