Abstract
A one-step efficacious method for the construction of a variety of substituted furano-, pyrano-, and pyrrolocoumarins and pyrroloquinolones in good to excellent yields has been developed.
ACKNOWLEDGMENTS
We thank the Department of Science and Technology (DST), New Delhi and the Council for Scientific and Industrial Research (CSIR), New Delhi, for financial assistance. S. M. and B. C. are thankful to the CSIR (New Delhi) for their fellowships.
Notes
a Overall yield.
dp – deallylated product.
nr – no reaction.
A = PdCl2 (4 mol %), Cu(acac)2·H2O (3 equiv), LiCl (3 equiv), DMF-water (9:1), rt, 3 h.
B = Pd(acac)2 (20 mol%), (0-tolyl)3P (40 mol %), acetic acid (10 equiv), CH3CN, 110 °C, 1 h.
C = AlCl3 (1.5 equiv), dichlorobenzene, reflux, 1 h.