1-Chloroethyl chloroformate → (5R,7R)-4-(4-((tert-butoxycarbonylamino)methyl)spiro[indoline-3,4'-piperidine]-1-yl)-5-methyl-6,7-dihydro-5H-cyclopenta[d]pyrimidin-7-yl 4-nitrobenzoate

Participants

Reaction Steps

To a stirred solution of (5R,7R)-4-(1′-benzyl-4-((tert-butoxycarbonylamino)methyl)spiro[indoline-3,4′-piperidine]-1-yl)-5-methyl-6,7-dihydro-5H-cyclopenta[d]pyrimidin-7-yl 4-nitrobenzoate (30 mg, 0.043 mmol) in toluene (1 mL) was added 1-chloroethyl carbonochloridate (0.009 mL, 0.08 mmol) at about 0° C. The reaction mixture was heated at reflux for 1 h and then evaporated in vacuo. The residue was dissolved in MeOH (1 mL) and the mixture was heated at reflux for 1 h. After cooling, the solvent was evaporated in vacuo to give crude (5R,7R)-4-(4-((tert-butoxycarbonylamino)methyl)spiro[indoline-3,4′-piperidine]-1-yl)-5-methyl-6,7-dihydro-5H-cyclopenta[d]pyrimidin-7-yl 4-nitrobenzoate, which was used in the next step without further purification. LCMS (APCI+) m/z 615 [M+H]+; Rt=3.31 min.

Provenance & Evidence