Benzoyl chloride → HCID 21313377, compound

Participants

Reaction Steps

Reaction of 4-methoxyphenylhydrazine with ethyl α-ketovalerate in ethanol using the procedure described above in Example 1; reduction with lithium aluminum hydride in tetrahydrofuran of the resulting ethyl α-(5-methoxy-2-methyl-3-indole)acetate; reaction of the resulting 3-(2-hydroxyethyl)-5-methoxy-2-methylindole with sodium hydride in DMF, and reaction of the resulting sodium salt with benzoyl chloride using the procedure described above in Example 1; and reaction of the resulting 1-benzoyl-3-(2-hydroxyethyl)-5-methoxy-2-methylindole with thionyl bromide in benzene in the presence of calcium carbonate using the procedure described in U.S. Pat. No. 3,517,028 affords 1-benzoyl-3-(2-bromoethyl)-5-methoxy-2-methylindole. The latter, on reaction with an appropriate amine in refluxing acetone in the presence of sodium carbonate affords the compounds of formula I in Examples 72-77 below where, in each instance, R1 is 5-CH3O; R2 is CH3 ; A is C6H5CO; and Alk is CH2CH2.

Provenance & Evidence