Sengodagounder Muthusamy, Ammasi Prabu and Eringathodi Suresh
Org. Biomol. Chem., 2019,17, 8088-8093
DOI:
10.1039/C9OB01275C,
Communication
An atom-economical synthesis of spiro-indolofurobenzopyrans was developed from diazoamides and O-propargyl salicylaldehydes in the presence of copper(I) thiophene-2-carboxylate in a diastereoselective manner. This methodology involves the preparation of carbonyl ylide intermediates followed by 1,3-dipolar cycloaddition with internal/external alkynes, offering a great potential for constructing biologically significant spiro-indolofurobenzopyrans, as thermodynamically controlled products, in a tandem manner.