Catalyst- and additive-free selective sulfonylation/cyclization of 1,6-enynes with arylazo sulfones leading to sulfonylated γ-butyrolactams
a School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China
b Qinghai Provincial Key Laboratory of Tibetan Medicine Research and Key Laboratory of Tibetan Medicine Research, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Qinghai 810008, China
c College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang 110034, China
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