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Heterocyclic analogs of xanthiones: 5,6-fused 3-methyl-1-phenylpyrano[2,3-c]pyrazol-4(1H) thiones—synthesis and NMR (1H, 13C, 15N) data

✍ Scribed by Valerie Huemer; Gernot A. Eller; Wolfgang Holzer

Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
145 KB
Volume
48
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

Various [5,6]pyrano[2,3‐c]pyrazol‐4(1__H__)‐thiones were synthesized in high yields by treatment of the corresponding [5,6]pyrano[2,3‐c]pyrazol‐4(1__H__)‐ones with Lawesson's reagent. Detailed NMR spectroscopic studies were undertaken of the title compounds. Complete and unambiguous assignment of chemical shifts (^1^H, ^13^C, ^15^N) and coupling constants (^1^H,^1^H; ^13^C,^1^H) was achieved by the combined application of various one‐ and two‐dimensional (1D and 2D) NMR spectroscopic techniques. Unequivocal mapping of most ^13^C,^1^H spin coupling constants is accomplished by 2D (δ, J) long‐range INEPT spectra with selective excitation. Copyright © 2010 John Wiley & Sons, Ltd.

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