HCID 178418361, compound → HCID 178471580, compound

Participants

Reaction Steps

To a solution of 1.09 g. (0.17 mmol) of diethyl N-[N-(2-pivaloylamino-4-hydroxypyrido[2,3-d]pyrimidin-6-ylmethyl)-N-formyl-4-aminomethylbenzoyl]-glutamate in 50 mL of glacial acetic acid was added 164 mg of platinum oxide. The suspension was shaken in a Parr hydrogenation apparatus under an atmosphere (50 psi) of hydrogen at 25° C. for 3 hours. The reaction mixture was filtered through Celite and the filtrate evaporated under reduced pressure. The residue was dissolved in 100 mL of methylene chloride and extracted twice with a saturated solution of sodium bicarbonate. The aqueous layers were back extracted with 75 mL of methylene chloride and the organic layers combined, dried over anhydrous magnesium sulfate, and filtered. The filtrate was evaporated under reduced pressure and the residue chromatographed, eluting with 5% methanol in methylene chloride to give 0.8 g of diethyl N-[N-(2-pivaloylamino-4-hydroxy-5,6,7,8-tetrahydropyrido[2,3-d]pyrimidin-6-ylmethyl)-N-formyl-4-aminomethylbenzoyl]-glutamate (73% yield). An analytical sample was recrystallized from acetonitrile; mp 149°-151° C.; 1H NMR (Me2SO d6) delta 1.11-1.16 (m, 6H), 1.18 (s, 9H), 1.83-2.15 (m, 4H), 2.30.varies.2.47 (m, 3H), 2.79-3.20 (m, 4H), 3.98-4.11 (m, 4H), 4.36-4.43 (m, 1H), 4.53-4.54 (m, 2H), 6.40-6.51 (m, 1H), 7.33-7.36 (m, 2H, AA'BB'), 7.80-7.85 (m, 2H, AA'BB'), 8.11 and 8.38 (s, 1H), 8.67-8.73 (m, 1 H). Anal. Calcd for C31H42N6O8 : C, 59.41; H, 6.75; N, 13.41. Found: C, 59.14; H, 6.73; N, 13.64.

Provenance & Evidence