A mild light-driven protocol for the direct alkylation of phenols is reported. The process is driven by the photochemical activity of a halogen-bonded complex formed upon complexation of the in situ generated electron-rich phenolate anion with the α-iodosulfone. The reaction proceeds rapidly (10 min) under microfluidic conditions, delivering a wide variety of ortho-alkylated products (27 examples,
Sulfonyl Group-Induced Remote C(sp<sup>3</sup>)–N Bond Construction through Hydrogen Atom Transfer
作者:Haotian Li、Xiancheng Qiu、Xu Zhang、Xinxin Wu
DOI:10.1021/acs.orglett.3c03401
日期:2023.12.15
merging aryl radical-mediated halogen atomtransfer and intramolecularlyregioselectivehydrogenatomtransfer (HAT). A plethora of aliphatic sulfones, sulfonamides, and sulfonates are amenable and undergo regioselective C(sp3)–H amination by utilizing an iron salt at room temperature. This protocol involves iodine atomtransfer, a HAT process enabled by an alkyl radical adjacent to a sulfonyl group, and
by the photochemical activity of allyl-functionalized phenolate anions, generated in situ upon deprotonation of the corresponding phenols. The reaction proceeds rapidly with reaction times as low as 35 min, delivering a wide range of densely functionalized products (20 examples, yields up to 69%). Mechanistic studies have also been performed providing convincing evidence for the photochemical formation
Because of the three-dimensional bioisosteric feature, bicyclo[1.1.1]pentylamines (BCPAs) are valuable scaffolds in synthetic chemistry and medicinal chemistry. Here, we report a Halogen Atom Transfer (XAT) mediated radical C–N coupling between C3-iodo-BCPs and diazonium salts in the presence of base. Similarly, a multicomponent reaction (MCR) enables the simultaneous construction of the C–C bond and