Corrigendum

This article refers to:

Efficient and Short Route for the Regioselective Synthesis of Highly Substituted, Angularly Fused Furano-, Pyrano-, and Pyrrolocoumarin/Quinolone Derivatives by Metal-Mediated Cyclization

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:

1. Throughout the article, Pd(acac)₂ should be replaced with Pd(OAc)₂.

2. Throughout the article, Cu(acac)₂ should be replaced with Cu(OAc)₂.

3. 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 1, and Structures 5 and 7 from Table 3) and the corresponding experimentals for 5 and 7. The corrected Scheme 1 and Table 3 are given here:

   Scheme 1 Synthesis of furano- and pyranocoumarin derivatives. Reagent and conditions: (i) PdCl₂ (4 mol%), Cu(OAc)₂.H₂O (3 eq), LiCl (3 equiv), DMF-water (9:1), rt, 3 h.

   

   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®.