HCID 69256685, compound → HCID 69256990, compound

Participants

Reaction Steps

A mixture of intermediate (54) (0.058 mol) in dioxane (400 ml) was stirred. A mixture of intermediate (3) (0.029 mol) and CaO (2.4 g) was added. The reaction mixture was stirred at 140° C. for 16 hours. The solvent was evaporated. DCM and water was added to the residue. The separated organic layer was dried, filtered and the solvent was evaporated. The residue was purified by high-performance liquid chromatography over silica gel (eluent:CH2Cl2/(CH3OH/NH3) 90/10). The product fractions were collected and the solvent was evaporated. The residue was dissolved in ethanol and converted into the ethanedioic acid salt (1:1). The formed precipitate was filtered off and dried, yielding 1.5 g of (S)-1-[3-[[(2,3-dihydro[1,4]dioxino[2,3-b]pyridin-3-yl)methyl]amino]propyl]dihydro-2,4(1H,3H)-pyrimidinedione (compound 25), mp.186; [α]D20 =−37.46°, (c=26.56 mg/5 ml DMF).

Provenance & Evidence