**Novel Synthesis of Dihydroisoxazoles by** *p***-TsOH-Participated 1,3-Dipolar Cycloaddition of Dipolarophiles with**α**-Nitroketones**

**Caiyun Yang 1, Sirou Hu 1, Xinhui Pan 1,2,\*, Ke Yang 1, Ke Zhang 1, Qingguang Liu 1, Xiaobing Xin 1, Jie Li 1, Jinhui Wang <sup>1</sup> and Xiaoda Yang 1,2,\***


**Abstract:** This article reports in detail a method for the synthesis of 3-benzoxoxazoline by the reaction of alkenes (alkynes) and a variety of α-nitroketones in the presence of *p*-TsOH. The scope of alkenes is broad, including different alkenes and the alkyne. This reaction provides a convenient and efficient synthetic method of 3-benzoylisoxazolines.

**Keywords:** α-nitroketones; alkenes; alkynes; 1,3-dipolar cycloaddition; *p*-TsOH; isoxazolines
