Triphenylphosphine → HCID 71086365, compound

Participants

Reaction Steps

To a solution of ethyl 4-(4-(tert-butoxycarbonyl)-2-((S)-3-(hydroxymethyl)-1,2,3,4-tetrahydroisoquinoline-2-carbonyl)phenyl)-5-butyl-1-phenyl-1H-pyrazole-3-carboxylate (113 mg, 0.177 mmol) in THF (2 mL) was added triphenylphosphine (55.8 mg, 0.213 mmol) followed by DIAD (0.041 mL, 0.213 mmol) and diphenyl phosphorazidate (58 mg, 0.21 mmol). After stirring at room temperature overnight, a second addition of all three reagents was added (1.2 eq each) and stirring was continued for 3 h. The reaction mixture was diluted with EtOAc, washed with sat. aq. sodium bicarbonate, dried over anhydrous sodium sulfate and concentrated in vacuo. The crude material was purified by flash chromatography (Isco 40 g column eluting with 0-50% EtOAc/hexanes) to give the title compound (86 mg, 73%). 1H NMR (CDCl3, 1:1 mixture of amide rotamers) δ 8.25 (s, 0.5H), 8.15-8.10 (m, 1H), 7.97 (s, 0.5H), 7.51-7.34 (m, 5H), 7.25-6.90 (m, 5H), 5.04-4.97 (m, 1.5H), 4.41-3.97 (m, 3.5H), 3.50-3.01 (m, 3.5H), 2.88-2.46 (m, 3.5H), 1.66-1.62 (m, 3H), 1.61 (s, 4.5H), 1.60 (s, 4.5H), 1.18-0.94 (m, 4H), 0.64-0.56 (m, 3H); MS(ESI) m/z 663.5 (M+H)+.

Provenance & Evidence