Yamada, Takayuki published the artcileFormal Lossen Rearrangement/Alkenylation or Annulation Cascade of Heterole Carboxamides with Alkynes Catalyzed by CpRhIII Complexes with Pendant Amides, Recommanded Product: O-Pivaloylhydroxylamine trifluoromethanesulfonate, the publication is Chemistry – A European Journal (2019), 25(70), 16022-16031, database is CAplus and MEDLINE.
A cyclopentadienyl (Cp) RhIII complex with two aryl groups and a pendant amide moiety catalyzed the formal Lossen rearrangement/alkenylation cascade of N-pivaloyl heterole carboxamides with internal alkynes was reported which led to alkenylheteroles. Interestingly, the use of sterically demanding internal alkynes afforded not the alkenylation but the [3+2] annulation products ([5,5]-fused heteroles). In these reactions, the pendant amide moiety of the CpRhIII complex may accelerate the formal Lossen rearrangement. The use of five-membered heteroles may deter reductive elimination to form strained [5,5]-fused heteroles; instead, protonation proceeded to give the alkenylation products. Bulky alkyne substituents accelerated the reductive elimination to allow the formation of the [5,5]-fused heteroles.
Chemistry – A European Journal published new progress about 1293990-73-4. 1293990-73-4 belongs to catalysis-chemistry, auxiliary class Aliphatic Chain, name is O-Pivaloylhydroxylamine trifluoromethanesulfonate, and the molecular formula is C8H5IO, Recommanded Product: O-Pivaloylhydroxylamine trifluoromethanesulfonate.
Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia