2',3',4',9'-TETRAHYDROSPIRO[CYCLOHEXANE-1,1'-(1H)PYRIDO[3,4-B]INDOL]-2-ONES AND THEIR TRANSFORMATIONS INTO 2,3,4,4A,5,6,9,14-OCTAHYDRO-4A-HYDROXY-1H,8H-PYRIDO[3,4-B-2,1-I']DIINDOLE-5-CARBONITRILES AND 5-SUBSTITUTED 2,3,4,4A,9,14-HEXAHYDRO-4A-HYDROXY-1H,8H-INDOLO[2',3'-3,4]-PYRIDO[1,2-C]BENZIMIDAZOL-6-(5H)ONES