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Updated: Jun 1, 2026

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
Published on: June 10, 2021
4-Methyl-9-[(4-methyl-phen-yl)sulfon-yl]thio-pyrano[3,4-b]indole-3(9H)-thione
Abstract:
The title compound, C(19)H(15)NO(2)S(3), is the first example of a dithia analogue of pyrano[3,4-b]indolone. The almost planar thio-pyrano-indole-thione ring system (r.m.s. deviation for all non-H atoms = 0.030 Å) makes a dihedral angle of 80.70 (8)° with the p-tolyl ring. In the crystal, mol-ecules are connected via C-H⋯O hydrogen bonds into two chains along the b axis. These chains are connected via π-π inter-actions between symmetry-related thio-pyrano-indole-thione ring systems [centroid-centroid distance = 3.588 (1) Å].
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