Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5264182 | Tetrahedron Letters | 2013 | 5 Pages |
Abstract
An efficient method for the regioselective synthesis of potentially biologically active tetrasubstituted 1-pyrazolines has been achieved via a 1,3-dipolar cycloaddition reaction. A range of tetrasubstituted 1-pyrazolines bearing one Boc group and two ester groups were obtained in high yields (up to 99%). The structure and relative stereochemistry of cycloadducts were confirmed by NMR spectra and single crystal X-ray diffraction. The possible mechanism was proposed and the major Z-cycloadducts as a single diastereomer could be separated from each other by chromatography.
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Authors
Hongbao Sun, Xiaoyan Wang, Miao Zhan, Jie Liu, Yongmei Xie,