In the article “Efficient and Short Route for the Regioselective Synthesis of Highly Substituted, Angularly Fused Furano-, Pyrano-, and Pyrrolocoumarin/Quinolone Derivatives by Metal-Mediated Cyclization,” by K. C. Majumdar, Shovan Mondal, and Buddhadeb Chattopadhyay, which was published in Volume 40, Number 14, 2010, pp. 2147–2157 of Synthetic Communications®, the authors suggest the following corrections to their article:
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Throughout the article, Pd(acac)2 should be replaced with Pd(OAc)2.
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Throughout the article, Cu(acac)2 should be replaced with Cu(OAc)2.
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We checked the reactions of compounds 2 to 5 and compound 6 to 7 again, and we are unable to reproduce the results. We, therefore, withdraw the conversions 2 to 5 and 6 to 7 (from Scheme , and Structures 5 and 7 from Table ) and the corresponding experimentals for 5 and 7. The corrected Scheme and Table are given here:
Table 3. Synthesis of furano-, pyrano-, and pyrrolocoumarin and quinolone derivatives
The authors apologize for any inconvenience these errors may have caused readers of Synthetic Communications®.