Total synthesis of 3,4-dihydrobenzo[h]quinazolin-4-one and structure elucidation of perlolidine and samoquasine A

The total synthesis of 3,4-dihydrobenzo[h]quinazolin-4-one is described. Based on the spectral data and chemical evidence, the structures of 3,4-dihydrobenzo[h]quinazolin-4-one, perlolidine, and samoquasine A are not the same. A structure for samoquasine A is suggested.