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The reaction provides a greener and more practical access to functionalized cyclobuta[a]naphthalen\u20104\u2010ols with valuable applications. More than 50 examples are demonstrated with excellent diastereoselectivity and chemical yields. The reaction pathway is proposed to proceed by the following steps:[2+2] cycloaddition, insertion of SO\n                    <jats:sub>2<\/jats:sub>\n                    , 1,4\u2010addition, diazotization, and tautomerization.\n                  <\/jats:p>","DOI":"10.1002\/anie.201707615","type":"journal-article","created":{"date-parts":[[2017,9,14]],"date-time":"2017-09-14T23:23:01Z","timestamp":1505431381000},"page":"15570-15574","source":"Crossref","is-referenced-by-count":217,"title":["Merging [2+2] Cycloaddition with Radical 1,4\u2010Addition: Metal\u2010Free Access to Functionalized Cyclobuta[\n                    <i>a<\/i>\n                    ]naphthalen\u20104\u2010ols"],"prefix":"10.1002","volume":"56","author":[{"given":"Feng","family":"Liu","sequence":"first","affiliation":[{"name":"School of Chemistry &amp; Materials Science Jiangsu Normal University  Xuzhou Jiangsu 221116 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jia\u2010Yin","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Chemistry &amp; Materials Science Jiangsu Normal University  Xuzhou Jiangsu 221116 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peng","family":"Zhou","sequence":"additional","affiliation":[{"name":"Institute of Chemistry &amp; BioMedical Sciences Collaborative Innovation Center of Chemistry for Life Sciences Nanjing University  Nanjing 210093 P. 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