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About the Cover:An organophosphoric acid catalyzed [3+3] cycliza-tion of 2-arylidene-indan-1,3-diones with enaminones has been established by Guo, Yu, Wan, Lu, Tan, and Shi on page 3727, affording a series of structurally diverse indenoquinolinedione derivatives in overall high yields. This [3+3] cyclization has some advantages such as mild reaction conditions, readily available catalyst and wide substrate range, which provides an efficient method for constructing biologically important 1,4-dihydro- pyridine motif.
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