Cationic Ruthenium Catalysts for Alkyne Annulations with Oximes by C–H/N–O Functionalizations
作者:Christoph Kornhaaß、Jie Li、Lutz Ackermann
DOI:10.1021/jo301768b
日期:2012.10.19
Cationic ruthenium(II) complexes enabled efficient redox-neutral annulations of alkynes with readily available oximes. The catalytic dehydrative C-H/N-O bond functionalization proved to be broadly applicable and was shown to proceed through a reversible cyclometalation.
Hydroxylamine-<i>O</i>
-Sulfonic Acid (HOSA) as a Redox-Neutral Directing Group: Rhodium Catalyzed, Additive Free, One-Pot Synthesis of Isoquinolines from Arylketones
作者:Pragati Biswal、Bedadyuti Vedvyas Pati、Rajesh Chebolu、Asit Ghosh、P. C. Ravikumar
DOI:10.1002/ejoc.201901825
日期:2020.2.28
A new reactivity of hydroxylamine‐O‐sulfonic acid (HOSA) has been demonstrated as redox‐neutral directing group for rhodium‐catalyzed one‐pot synthesis of diverse isoquinolines. This protocol reveals the utility of HOSA as a dircting group for the addditive free C–H/N–O annulations. Moreover, the in situ cleavage of the directing group reduces one step making it as a step‐economical process.