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  • Efficient method for the synthesis of functionalized pyrazoles by catalyst-free one-pot tandem reaction of nitroalkenes with ethyl diazoacetate.

Efficient method for the synthesis of functionalized pyrazoles by catalyst-free one-pot tandem reaction of nitroalkenes with ethyl diazoacetate.

Organic & biomolecular chemistry (2009-10-16)
Jian-Wu Xie, Zheng Wang, Wei-Jun Yang, Li-Chun Kong, Dong-Cheng Xu
ABSTRACT

The one-pot synthesis of multisubstituted pyrazole derivatives was achieved via catalyst-free 1,3-dipolar cycloaddition of ethyl diazoacetate and nitroalkenes as the key step and elimination of the leaving group (NO(2) or Br) followed by intramolecular proton transfer with satisfactory yields.

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Ethyl diazoacetate, contains ≥13 wt. % dichloromethane
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