tert-butyl [7-(hepta-1,6-dien-4-yl)-2-methyl-3-oxo-2,3-dihydro-1H-isoindol-4-yl]carbamate → tert-butyl [7-(cyclopent-3-en-1-yl)-2-methyl-3-oxo-2,3-dihydro-1H-isoindol-4-yl]carbamate

Participants

Reaction Steps

To a solution of tert-butyl[7-(hepta-1,6-dien-4-yl)-2-methyl-3-oxo-2,3-dihydro-1H-isoindol-4-yl]carbamate (Compound 243D, 180 mg, 0.50 mmol) in DCM (10 mL) was added (benzylidene)bis(tricyclohexylphosphine)ruthenium(IV)dichloride (21 mg, 0.025 mmol). The resulting mixture was stirred at rt under nitrogen. The solvent was evaporated under reduced pressure, and the residue was purified by silica gel chromatography (ISCO Combi-flash system, eluting with 10-30% EtOAc/Heptane) to give the title compound as a white solid, 150 mg, 90% yield. 1H NMR (CDCl3): 1.54 (s, 9H), 2.43-2.48 (m, 2H), 2.81-2.86 (m, 2H), 3.18 (s, 3H), 3.45 (m, 1H), 4.32 (s, 2H), 5.80-5.84 (m, 2H), 7.35 (d, J=8.6 Hz, 1H), 8.12 (d, J=8.6 Hz, 1H), 9.53 (br s, 1H). MS (ES+): m/z=329.13 [MH+]. HPLC: tR=4.65 min (ZQ3, polar—5 min).

Provenance & Evidence