Microwave induced selective enolization of steroidal ketones and efficient acetylation of sterols in semisolid state
作者:Padma Marwah、Ashok Marwah、Henry A. Lardy
DOI:10.1016/s0040-4020(03)00207-2
日期:2003.3
Under microwave irradiation steroidal enones, more specifically, position three carbonyls were efficiently and selectively converted to the corresponding enol acetates in the presence of additional enolizable carbonyl functions at other positions, using aceticanhydride and a catalytic amount of toluene-p-sulfonic acid. Acetylation of hydroxyl groups of the sterols, including those at the hindered
Ketones as directing groups in photocatalytic sp<sup>3</sup> C–H fluorination
作者:Desta Doro Bume、Cody Ross Pitts、Fereshte Ghorbani、Stefan Andrew Harry、Joseph N. Capilato、Maxime A. Siegler、Thomas Lectka
DOI:10.1039/c7sc02703f
日期:——
The ubiquitous ketone carbonyl group generally deactivates substrates toward radical-based fluorinations, especially sites closest to it. Herein, ketones are used instead to direct aliphatic fluorination using Selectfluor, catalytic benzil, and visible light. Selective β- and γ-fluorination are demonstrated on rigid mono-, di-, tri-, and tetracyclic (steroidal) substrates employing both cyclic and