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Mixed aldol condensation of 1-oxo-1,2,3,8-tetrahydrocyclopent[b]- indole (1a-d) with pyridine-2- ldehyde (2) under basic condition led to formation of 2-pyridelydine-1-oxo-1,2,3,8-tetrahydrocyclopent[b]indole (3a-d). To an ethanolic solution of 2-pyridelydine-1-oxo-1,2,3,8-tetrahydrocyclopent[b]indole(3a-d) is refluxed with hydrazine hydrate resulted 3-pyridyl-3,3a,4,9-tetrahydro-2H-pyrazolino[3’,4’:5,4]cyclopent[b]indole (4a-d).

SYNTHESIS OF 3-(PYRIDYL)-3,3A,4,9-TETRAHYDRO-2H-PYRAZOLINO[3’,4’:5,4]CYCLOPENT[B]INDOLE