Copper nitrate-catalyzed oxidative coupling of unactivated C(sp<sup>3</sup>)–H bonds of ethers and alkanes with <i>N</i>-hydroxyphthalimide: synthesis of <i>N</i>-hydroxyimide esters
between N-hydroxyphthalimide (NHPI) and ethers/alkanes has been described. The reaction is accomplished smoothly by using simple and green molecular oxygen as the oxidant, providing an alternative for the efficient synthesis of N-alkoxyphthalimides. In addition, it was found that when tert-butyl ethers were used as substrates, unexpected N-hydroxyimide ester derivatives were obtained in moderate to
Synthesis of α-oxygenated ketones and substituted catechols via the rearrangement of N-enoxy- and N-aryloxyphthalimides
作者:Michelle A. Kroc、Aditi Patil、Anthony Carlos、Josiah Ballantine、Stephanie Aguilar、Dong-Liang Mo、Heng-Yen Wang、Daniel S. Mueller、Donald J. Wink、Laura L. Anderson
DOI:10.1016/j.tet.2017.01.061
日期:2017.7
synthesis of α-oxygenated carbonylcompounds and catechols is the treatment of a carbonylcompound or a phenol with an electrophilic oxygen source. As an alternative approach to these important structures, formal [3,3]-rearrangements of N-enoxyphthalimides, N-enoxyisoindolinones, and N-aryloxyphthalimides have been explored. When used in combination with an initial Chan-Lam coupling, these transformations
Photo-induced radical borylation of hemiacetals via C–C bond cleavage
作者:Qianyi Liu、Jianning Zhang、Lei Zhang、Fanyang Mo
DOI:10.1016/j.tet.2020.131867
日期:2021.1
In this study, we reported a photo-induced radical borylation of hemiacetal derivatives via C–Cbondcleavage. This transformation can be realized under mild conditions with simple reaction settings and irradiation of visible light. A series of substrates, including both cyclic and linear hemiacetal derivatives, were effectively transformed to the borylation product in moderate to good yields. Finally
A novel, sustainable, environmentally friendly, solvent-free and metal catalyst-free method for the CDC reaction between NHPI and benzyl/ether compounds is described.
Photoinduced Fragmentation Borylation of Cyclic Alcohols and Hemiacetals
作者:Chao Shu、Rudrakshula Madhavachary、Adam Noble、Varinder K. Aggarwal
DOI:10.1021/acs.orglett.0c02513
日期:2020.9.18
conveniently prepared by radical-mediated ring opening of cyclic alcohols and hemiacetals, respectively. The reactions proceed under mild conditions in the absence of additives or photocatalysts, display excellent functional group tolerance, and are shown to allow cleavage of 4-, 5-, 6-, and 7-membered ring substrates. The mechanism proceeds via sequential homolytic N–O and C–C bond cleavages, the latter