4-Ethylphenyl isocyanate → (2S,4R)-tert-butyl 4-(((9H-fluoren-9-yl)methoxy)carbonylamino)-2-((4-ethylphenylcarbamoyloxy)methyl)pyrrolidine-1-carboxylate

Participants

Reaction Steps

To a solution of (2S,4R)-tert-butyl 4-(((9H-fluoren-9-yl)methoxy)carbonylamino)-2-(hydroxymethyl)pyrrolidine-1-carboxylate (403 mg, 0.92 mmol) and DMAP (134 mg, 1.1 mmol) in THF (10 mL) was added 4-ethylphenyl isocyanate (162 mg, 11 mmol). The reaction mixture was stirred at rt overnight and concentrated to give (2S,4R)-tert-butyl 4-(((9H-fluoren-9-yl)methoxy)carbonylamino)-2-((4-ethylphenylcarbamoyloxy)methyl)pyrrolidine-1-carboxylate, which was used without further purification. LRMS (M+H+) m/z 585.1.

Provenance & Evidence