{"title":"Norrish-Yang-type cyclopropanation via functional group migration with photosensitizer at ppb loading","authors":"Yingru Xu, Jianjian Huang, Tengfei Pang, Guojiao Wu, Fangrui Zhong","doi":"10.1016/j.checat.2024.101099","DOIUrl":null,"url":null,"abstract":"<p>The classic Norrish-Yang cyclization of ketones and their alkene counterparts is a well-known photochemical rearrangement strategy utilized for building cyclobutanes through hydrogen atom transfer. Herein, a noncanonical Norrish-Yang-type rearrangement involving the migration of functional groups, such as cyano and aryl, is established through energy transfer catalysis, facilitating facile assembly of three-membered cyclopropanes. With a focus on reactions translocating a cyano group, this protocol showcases a broad substrate scope (58 entries), operates under mild reaction conditions, and requires an extremely low catalyst loading (100 ppb, 12 h, 97% yield). Impressively, a total turnover number (TTN) of 1.15 × 10<sup>7</sup> was recorded. Mechanistic experiments uncovered a unique fluorescence enhancement phenomenon of photocatalysts, characterized by a linear Stern-Volmer plot with an unusual negative slope. The present Norrish-Yang-type cyclization significantly expands the synthetic repertoire of photochemical rearrangement for preparing distinct ring frameworks.</p>","PeriodicalId":53121,"journal":{"name":"Chem Catalysis","volume":"6 1","pages":""},"PeriodicalIF":11.5000,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Chem Catalysis","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1016/j.checat.2024.101099","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
The classic Norrish-Yang cyclization of ketones and their alkene counterparts is a well-known photochemical rearrangement strategy utilized for building cyclobutanes through hydrogen atom transfer. Herein, a noncanonical Norrish-Yang-type rearrangement involving the migration of functional groups, such as cyano and aryl, is established through energy transfer catalysis, facilitating facile assembly of three-membered cyclopropanes. With a focus on reactions translocating a cyano group, this protocol showcases a broad substrate scope (58 entries), operates under mild reaction conditions, and requires an extremely low catalyst loading (100 ppb, 12 h, 97% yield). Impressively, a total turnover number (TTN) of 1.15 × 107 was recorded. Mechanistic experiments uncovered a unique fluorescence enhancement phenomenon of photocatalysts, characterized by a linear Stern-Volmer plot with an unusual negative slope. The present Norrish-Yang-type cyclization significantly expands the synthetic repertoire of photochemical rearrangement for preparing distinct ring frameworks.
期刊介绍:
Chem Catalysis is a monthly journal that publishes innovative research on fundamental and applied catalysis, providing a platform for researchers across chemistry, chemical engineering, and related fields. It serves as a premier resource for scientists and engineers in academia and industry, covering heterogeneous, homogeneous, and biocatalysis. Emphasizing transformative methods and technologies, the journal aims to advance understanding, introduce novel catalysts, and connect fundamental insights to real-world applications for societal benefit.