High pressure-assisted condensation reaction of acylated glucosyl bromides with complex alcohols in the presence of diisopropylethylamine and tetrabutylammonium bromide gave the corresponding 1,2-orthoesters in good to excellent yields without using heavy metal salts.
reactions of Togni-II reagent and thiols, a thiol-tuned selective functionalization of unactivated olefins was disclosed. In combination with aryl thiols, stoichiometric amount of Togni-II reagent prompted a hydrotrifluoromethylation of alkenes, in which, aryl thiols played as reductant and hydrogen source; while by utilization of alkyl thiols, catalytic amount of Togni-II reagent initiated thiol-ene
Cobalt‐Catalysed Reductive Etherification Using Phosphine Oxide Promoters under Hydroformylation Conditions
作者:Fábio G. Delolo、Johannes Fessler、Helfried Neumann、Kathrin Junge、Eduardo N. dos Santos、Elena V. Gusevskaya、Matthias Beller
DOI:10.1002/chem.202103903
日期:2022.2.21
No noble metal needed: The cobalt-catalysed reductive etherification of aldehydes with alcohols under syngas conditions has been investigated and proved to be efficient for a broad range of coupling partners. The promoting effect of phosphine oxides allows for a milder and more general reaction: the methodology presented a good functional group tolerance and could be applied to natural alcohols.
Engaging allenes in transition-metal-catalyzed C–Hbond activation strategy is immensely promising to access high-value scaffolds. However, such a reaction manifold remains largely elusive using cheap and sustainable ruthenium catalysis. We disclose an unprecedented ruthenium-catalyzed (4 + 2) annulation between aromatic amides and allenylphosphine oxides, furnishing NH-free isoquinolinones in high
Labeled chemically reactive and biologically active conjugates, and methods and compositions thereof
申请人:Sun Yi
公开号:US10815248B2
公开(公告)日:2020-10-27
The invention generally relates to novel fluorophore-labeled, bi- or multi-functional, chemically reactive and/or biologically active conjugates, and related compositions and methods thereof.