Diisopropylethylamine → (+/-)-4-(2-Oxo-1,4-dihydro-2H-quinazolin-3-yl)-piperidine-1-carboxylic acid [2-[1,4']bipiperidinyl-1'-yl-1-(7-methyl-1H-indazol-5-ylmethyl)-2-oxo-ethyl]-amide

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Reaction Steps

A stirred solution of (±)-3-(7-methyl-1H-indazol-5-yl)-2-{[4-(2-oxo-1,4-dihydro-2H-quinazolin-3-yl)-piperidine-1-carbonyl]-amino}-propionic acid (65.7 mg, 0.138 mmol) in 2:1 dimethylformamide/methylene chloride (1.5 mL) at 0° C. was treated with 4-(1-piperidyl)-piperidne (46.5 mg, 2 equiv), diisopropylethylamine (0.048 mL, 2 equiv) and PyBOP® (75.5 mg, 1.05 equiv). The ice bath was allowed to melt and the mixture was stirred at room temperature overnight. The solvents were removed under high vacuum and the residue was purified by flash chromatography on silica gel, eluting with 18:1 methylene chloride/methanol containing 1% triethylamine, to give the product as a pale-yellow solid (80.4 mg, 93%). 1H-NMR (CD3OD, 500 MHz) δ −0.28 (1H, m), 0.75 (1H, m), 1.2-2.0 (12H, m), 2.08 (2H, m), 2.4-2.5 (3H, m), 2.59 (3H, s), 2.68 (2H, m), 2.90 (4H, m), 3.08 (4H, m), 3.9-5.1 (4H, several m), 6.81 (1H, d), 6.96 (1H, t), 7.16 (3H, m), 7.49 (1H, s), 8.03 (1H, s). Mass spec.: 627.29 (MH)+.

Provenance & Evidence