反应详情

To a solution of 4-[4-chloro-2-[(4-chlorophenyl)amino]-7-(1-ethylpropyl)-1H-benzimidazol-1-yl]butan-1-ol (Reference Example 36; 200 mg, 0.48 mmol) and triphenylphosphine (186 mg, 0.71 mmol) in tetrahydrofuran (10 mL) was added diisopropyl azodicarboxylate (0.140 mL, 0.71 mmol) dropwise at 0° C. The mixture was warmed to room temperature and stirred for 24 hours followed by concentration in vacuo. The residue was purified by flash chromatography on silica gel eluting with a 10-25% ethyl acetate/n-hexane gradient mixture. The filtrate was concentrated in vacuo to give the solid, which was recrystallized from ethyl acetate/isopropyl ether to give the title compound (105 mg, 0.26 mmol, 54%) as a colorless solid.

1. concentrationfollowed by concentration in vacuo
2. customThe residue was purified by flash chromatography on silica gel eluting with a 10-25% ethyl acetate/n-hexane gradient mixture
3. concentrationThe filtrate was concentrated in vacuo
4. customto give the solid, which
5. customwas recrystallized from ethyl acetate/isopropyl ether