Triphenylphosphine → 2-(5-Amino-1-{3-[2-(tetrahydro-pyran-2-yloxy)-ethoxy]-phenyl}-1H-pyrazol-3-yl)-2-methyl-propionitrile

Participants

Reaction Steps

To an ice cooled solution of Intermediate 20b (363 mg, 1.50 mmol), 2-(tetrahydro-2H-pyran-2-yloxy)ethanol (329 mg, 305 μL, 2.25 mmol) and triphenylphosphine (786 mg, 3.00 mmol) in anhydrous THF (10 mL) was added dropwise diisopropyl azodicarboxylate (606 mg, 590 μL), and the ice bath removed and stirring continued under an Ar atmosphere. After 3 h, a further 1.0 eq of diisopropyl azodicarboxylate was added and the reaction stirred overnight. The reaction mixture was then concentrated in vacuo and subjected to FCC, eluting with 5-50% EtOAc in cyclohexane. The isolated product was repurified using FCC, eluting with 2.5-7.5% Et2O in DCM, to afford the title compound as a yellow oil (317 mg, 57%). LCMS (Method 3): Rt 3.67 min, m/z 393.3 [M+Na].

Provenance & Evidence