1-Chloroethyl chloroformate → 4-Ethenyl-2,3-dihydro-1H-isoindole

Participants

Reaction Steps

A solution of 2-benzyl-4-vinylisoindoline 82 (1.0 eq.) in DCE (0.38 M) was placed in a round bottom flask under nitrogen. To this was attached an addition funnel containing a solution of 1-chloroethyl chloroformate (1.2 eq.) in DCE. The reaction flask was cooled in an ice bath and the contents of the addition funnel were added dropwise over 20 min keeping the internal reaction temperature <5° C. After the addition was complete the reaction flask was allowed to warm to RT then heated to reflux for 45 min. The contents of the reaction flask were cooled to RT then the solvent removed by evaporation. MeOH was added and the contents of the reaction flask were heated to reflux for 30 min. The reaction flask was cooled and the solvent removed by evaporation. Water was added and the resulting mixture washed with EtOAc. The aqueous layer was made basic with 2N sodium hydroxide then extracted with DCM (4×250 mL). The combined organic extracts were dried with anhydrous sodium sulfate, filtered and the filtrate evaporated. The remaining residue was subjected to flash column chromatography eluting with DCM/MeOH/ammonium hydroxide 97/3/0.3 to 95/5/0.5. Evaporation of fractions gave the title compound 83 as a brown oil, (71% for two steps). LRMS (ESI) m/z 146 (M+H)+.

Provenance & Evidence