Description:
<jats:title>Abstract</jats:title><jats:p>A [3+1+1+1] cycloaddition was developed among 2‐arylpropene, ketone and DMSO in the presence of K<jats:sub>2</jats:sub>S<jats:sub>2</jats:sub>O<jats:sub>8</jats:sub>. 2‐arylpropene provides three carbons, ketone offers one carbon, and DMSO as dual carbon donor contributes two carbons to the six‐membered carbocycle. It gave the cyclohexene motif and spirocyclohexene skeleton. Four C−C bonds formed in this process. Both propylene and ketone could be well tolerated and give the corresponding cyclohexene or spirocyclohexene motif in useful yields. Based on the controlled experiments, a possible mechanism was proposed.</jats:p><jats:p><jats:boxed-text content-type="graphic" position="anchor"><jats:graphic xmlns:xlink="http://www.w3.org/1999/xlink" mimetype="image/png" position="anchor" specific-use="enlarged-web-image" xlink:href="graphic/adsc202100115-toc-0001-m.png"><jats:alt-text>magnified image</jats:alt-text></jats:graphic></jats:boxed-text>
</jats:p>