Triphenylphosphine → tert-butyl 4-(4-nitro-1H-pyrazol-1-yl)piperidine-1-carboxylate

Participants

Reaction Steps

1-Boc-4-hydroxy piperidine (2.6 g, 0.0132 mol), triphenylphosphine (4.1 g, 0.015 mol) and di-tert-butyl azodicarboxylate (3.9 g, 0.0172 mol) are added in portions to a solution of 4-nitro-1H-pyrazole (1.5 g, 0.0132 mol) in THF (40 ml) at 10-15° C. The reaction mixture is stirred at room temperature for 48 h. The mixture is evaporated in a rotary evaporator, and the crude material is chromatographed, giving 2.1 g of a white solid;

Provenance & Evidence