Triphenylphosphine → 5-Chloro-N-[1,3-dioxo-2-(4-piperidinylmethyl)-2,3-dihydro-1H-isoindol-4-yl]-2-thiophenecarboxamide

Participants

Reaction Steps

At room temperature, 0.43 ml (2.73 mmol) of diethyl azodicarboxylate (DEAD) is added dropwise to a suspension of 670 mg (2.18 mmol) of 5-chloro-N-(1,3-dioxo-2,3-dihydro-1H-isoindol-4-yl)-2-thiophenecarboxamide, 314 mg (2.73 mmol) of 4-hydroxymethylpiperidine and 716 mg (2.73 mmol) of triphenylphosphine in 8.7 ml of absolute THF. After 2 h at room temperature, the mixture is concentrated and the residue is separated by chromatography on silica gel (gradient: from dichloromethane/methanol 95:5 to dichloromethane/methanol/triethylamine 9:1:0.1). Yield: 430 mg (41.5% of theory); MS (ESI): m/z (%)=404 (M+H, 60), 145 (100); LC-MS (Method 4): rt (%)=3.02 (84).

Provenance & Evidence