Dimethylamine → HCID 12084978, compound

Participants

Reaction Conditions

Reaction Steps

A stream of gaseous dimethylamine is passed into a mixture of 15 g (44.4 mmol) of ethyl 3-[6-chloro-2-(methoxycarbonyl)-1-methyl-1H-indol-3-yl]-3-oxo-propanoate, obtained in step 2.1., and 0.2 g (1.63 mmol) of 4-(N,N-dimethyl)aminopyridine in 100 ml of toluene. Immediately a condenser, surmounted by a balloon flask, is fitted and the solution is stirred at 100° C. under low pressure for 20 h. The mixture is cooled to ambient temperature and concentrated under reduced pressure and the residue is chromatographed on a silica gel column (eluent: cyclohexane/dichloromethane:50/50, then dichloromethane/ethyl acetate: 100/0 to 0/100). This gives 3.8 g of a yellow solid which is recrystallized from a dichloromethane/ethyl acetate mixture.

Provenance & Evidence