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Conventional methods rely on hazardous diazo precursors or pre\u2010functionalized substrates that generate stoichiometric byproducts. Here, we report an overall endergonic, catalytic route to cyclopropanes from abundant, renewable starting materials. Furan oxetanes, readily formed by photochemical [2 + 2] cycloaddition of aldehydes and furan, undergo an intramolecular S\n                    <jats:sub>N<\/jats:sub>\n                    \u2010type rearrangement under Lewis acid catalysis, producing cyclopropanes with ideal atom economy. The strategy enables access to\n                    <jats:italic>meso<\/jats:italic>\n                    \u2010cyclopropane dicarbaldehydes, which are versatile intermediates that streamline the preparation of otherwise challenging bioactive motifs. By harnessing photogenerated oxetanes as cyclopropane precursors, this work offers a sustainable way to densely functionalized cyclopropanes from simple feedstocks under mild conditions.\n                  <\/jats:p>","DOI":"10.1002\/anie.3547092","type":"journal-article","created":{"date-parts":[[2026,6,26]],"date-time":"2026-06-26T11:35:52Z","timestamp":1782473752000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Photogenerated Oxetanes as a Gateway to Uphill Cyclopropanation"],"prefix":"10.1002","volume":"65","author":[{"ORCID":"https:\/\/orcid.org\/0009-0005-7901-2681","authenticated-orcid":false,"given":"Tim","family":"K\u00f6glmeier","sequence":"first","affiliation":[{"name":"Institut F\u00fcr Organische Chemie Universit\u00e4t Regensburg  Regensburg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-6363-5584","authenticated-orcid":false,"given":"Thomas J.","family":"Tiefel","sequence":"additional","affiliation":[{"name":"Institut F\u00fcr Organische Chemie Universit\u00e4t Regensburg  Regensburg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1430-573X","authenticated-orcid":false,"given":"Oliver","family":"Reiser","sequence":"additional","affiliation":[{"name":"Institut F\u00fcr Organische Chemie Universit\u00e4t Regensburg  Regensburg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,6,26]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1093\/oso\/9780198506980.001.0001"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.jmedchem.6b00472"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1055\/s\u20100032\u20101317011"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1002\/chem.202004178"},{"key":"e_1_2_8_6_1","first-page":"1","volume-title":"Organic Reactions","author":"Davies H. 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