反应详情

To a solution of (6c), 2-[5-amino-2-oxo-1-(2-trimethylsilanyl-ethoxymethyl)-1,2-dihydro-pyridin-3-yl]-indole-1-carboxylic acid tert-butyl ester (0.3 g, 0.659 mmol) in acetonitrile (10 mL) was added 1-benzyl-1H-pyrazole-4-carboxylic acid (0.111 g, 0.549 mmol) and triethylamine (0.133 g, 0.184 mL, 1.32 mmol). O-benzotriazole-N,N,N′,N′-tetramethyluroniumhexafluorophosphate (0.312 g, 0.823 mmol) was added last and the reaction mixture was stirred at ambient temperature for 18 hours. The reaction mixture was concentrated in vacuo and the residue was partitioned between ethyl acetate (25 mL) and aqueous saturated sodium hydrogen carbonate solution (20 mL). The organic layer was separated and the aqueous was extracted with a further portion of ethyl acetate (25 mL). The combined ethyl acetate layers were washed with brine, dried (Na2SO4) and concentrated in vacuo. The resultant crude product was purified by flash chromatography on SiO2 eluting with hexane—35% ethyl acetate/hexane—50% ethyl acetate/hexane (gradient) to afford the desired title compound as a light brown solid, 0.246 g, 70%.

1. concentrationThe reaction mixture was concentrated in vacuo
2. customthe residue was partitioned between ethyl acetate (25 mL) and aqueous saturated sodium hydrogen carbonate solution (20 mL)
3. customThe organic layer was separated
4. extractionthe aqueous was extracted with a further portion of ethyl acetate (25 mL)
5. washThe combined ethyl acetate layers were washed with brine
6. dry with materialdried (Na2SO4)
7. concentrationconcentrated in vacuo
8. customThe resultant crude product was purified by flash chromatography on SiO2 eluting with hexane—35% ethyl acetate/hexane—50% ethyl acetate/hexane (gradient)