1,2,3,9a-TETRAHYDRO-9H-IMIDAZOINDOLES

Article abstract of DOI:10.1007/BF00663859

When derivatives of 1,2,3,9a-tetrahydro-9H-imidazo<1,2-a>indol-2-one or 1-carbamoylmethyl-2-methylene-2,3-dihydroindole are reacted with lithium aluminium hydride, derivatives of 1,2,3,9a-tetrahydro-9H-imidazo<1,2-a>indole are formed.Under the same conditions 1-(N-phenylcarbamoylmethyl)-2-methylene-2,3-dihydroindole is not cyclized to an imidazo<1,2-a)indole.When treated with proton acids imidazo<1,2-a>indoles are converted to 3H-indolium salts.Opening of the imidazolidine ring is also found when imidazo<1,2-a>indole is acylated with benzoyl chloride.