反应详情

A solution of 6-oxo-1,6-dihydro-pyridazine-4-carboxylic acid (11.5 g), TBTU (25.3 g), triethylamine (20.9 mL) and 40 mL DMF in 200 mL THF was stirred for 30 minutes at ambient temperature. Then n-butyl (S)-3-amino-tetrahydrofuran-3-carboxylate (14.0 g) was added and the mixture was stirred further overnight. For working up the mixture was evaporated to dryness in vacuo and the residue was stirred with 200 mL of ethyl acetate. This solution was washed twice with 5% sodium hydrogen carbonate solution, then dried and evaporated down. The product was thus obtained in a yield of 90% of theory.

1. customwas evaporated to dryness in vacuo
2. stirringthe residue was stirred with 200 mL of ethyl acetate
3. washThis solution was washed twice with 5% sodium hydrogen carbonate solution
4. customdried
5. customevaporated down
6. customThe product was thus obtained in a yield of 90% of theory