Facile Synthesis of Substituted Furo- and Pyrano-Carbazoles

Abstract

Simple and efficient method for the synthesis of substituted furo- and pyrano-carbazole derivatives from 1-hydroxycarbazoles was described.

GRAPHICAL ABSTRACT

Keywords:

• Furo[2,3-a]carbazole
• 1-hydroxycarbazole
• 1-hydroxycarbazole-2-carbaldehyde
• 3-substituted pyrano[3,4-a]carbazoles
• 3,4,5,6-tetrahydro-isochromeno[3,4-a]carbazoles

ACKNOWLEDGMENTS

K. P. thanks the Council of Scientific and Industrial Research (CSIR), New Delhi for providing a CSIR-senior research fellowship. Our sincere thanks go to the director, ISO Quality Assurance Cell, Indian Institute of Chemical Technology, Hyderabad, and SAIF, Indian Institute of Technology Madras, Chennai, and the Chairman, NMR Research Centre, IISc, Bangalore, for providing access to their mass and NMR spectral facilities, respectively.

Notes

Notes. rt, room temperature; nr, no reaction.