Synthesis and Biological Activity of 2-Mercapto-7,10-Dimethyl-3H-Spiro[Benzo[H]Quinazoline-5,1′-Cyclopentane]-4(6H)-One from Ethyl 4′-Amino-5′,8′-Dimethyl-1′H-Spiro[Cyclopentane-1,2′-Naphthalene]-3′-Carboxylate.

A synthetic method for 7,10-dimethyl-2-thioxo-2,3-dihydro-1H-spiro[benzo[h]quinazoline-5,1′-cyclopentane]- 4(6H)-one from ethyl 4′-amino-5′,8′-dimethyl-1′-H-spiro[cyclopentane-1,2′-naphthalene]-3′-carboxylate was developed. Reaction of the spirobenzo[h]quinazoline with various alkyl(benzyl) halides synthesized a novel series of spirobenzo[h]quinazolines containing methyl substituents on the benzene ring. The antidepressant, anticonvulsant, and antibacterial activities of the synthesized spirobenzo[h]quinazolines were investigated. [ABSTRACT FROM AUTHOR]