Tandem C-C Bond Cleavage of Cyclopropanols and Oxidative Aromatization by Manganese(IV) Oxide in a Direct C-H to C-C Functionalization of Heteroaromatics
作者:Desta Doro Bume、Cody Ross Pitts、Thomas Lectka
DOI:10.1002/ejoc.201501405
日期:2016.1
report a directC–H to C–Cbondfunctionalization of electron-deficient heteroaromatics enabled by mild C–Cbondcleavage of cyclopropanols as a new route to β-aryl carbonyl-containing products. Additionally, as an alternative to using a “catalyst” that requires an excess amount of a sacrificial oxidant for regeneration and/or oxidativearomatization, this paper features manganese(IV) oxide as an inexpensive
A number of aliphatic and arylaliphatic α,β-epoxy ketones were prepared in good yields in a one-pot procedure by a manganese-catalyzed ring cleavage of 1-substituted and 1,2-disubstituted cyclopropanols with oxygen followed by dehydration of the resulting cyclic peroxides with alkali.
Site-Selective Approach to β-Fluorination: Photocatalyzed Ring Opening of Cyclopropanols
作者:Steven Bloom、Desta Doro Bume、Cody Ross Pitts、Thomas Lectka
DOI:10.1002/chem.201501081
日期:2015.5.26
the next rational step is to focus on directing “radical‐based fluorination” more effectively. One potential solution entails selective CC bond activation as a prelude to selective fluorination. Herein, we report the tandem photocatalyzed ring‐opening/fluorination reactions of cyclopropanols by 1,2,4,5‐tetracyanobenzene (TCB) and Selectfluor to afford a process tantamount to site‐selective β‐fluorination