Ethyl Acetate → tert-butyl ((1S,3R)-3-((3-carbamoyl-6-(hydrazinecarbonyl)pyrrolo[1,2-b]pyridazin-4-yl)amino)-1,2,2-trimethylcyclopentyl)carbamate

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A solution of 4-(((1R,3S)-3-((tert-butoxycarbonyl)amino)-2,2,3-trimethylcyclopentyl)amino)-3-carbamoylpyrrolo[1,2-b]pyridazine-6-carboxylic acid (3.0 g, 6.73 mmol), BOP (3.57 g, 8.08 mmol) and hydrazine (1.057 mL, 33.7 mmol) in DMF (25 mL) was stirred for 30 minutes, and then the reaction mixture was added 350 mL of EtOAc which was washed with 10% LiCl solution (2×100 mL), 100 mL of brine and dried over Na2SO4. Filtration and concentration gave the desired tert-butyl ((1S,3R)-3-((3-carbamoyl-6-(hydrazinecarbonyl)pyrrolo[1,2-b]pyridazin-4-yl)amino)-1,2,2-trimethylcyclopentyl)carbamate (3.29 g, 99% yield). HPLC retention time=2.457 min., LC/MS (M+H)+=460.4.

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