Tu, Jianzhuo published the artcileIntramolecular (4+3) Cycloadditions of Oxidopyridinium Ions: Towards Daphnicyclidin A, Recommanded Product: Allyldiphenylphosphine oxide, the publication is Chemistry – A European Journal (2022), 28(41), e202200370, database is CAplus and MEDLINE.
N-alkylation of 5-hydroxynicotinic acid esters with electrophiles containing diene functionality produces salts that underwent intramol. (4+3) cycloaddition reactions upon heating in the presence of base. Initial studies used a three-carbon tether to join the pyridinium ion and diene, revealing some aspects of the inherent selectivity of the reaction with such substrates. Much more challenging was the synthesis of related species possessing only a two-carbon tether. Nevertheless, the cycloaddition of such compounds was successful, leading directly to the ABC ring system of the alkaloid daphnicyclidin A.
Chemistry – A European Journal published new progress about 4141-48-4. 4141-48-4 belongs to catalysis-chemistry, auxiliary class Aryl phosphine ligand,Mono-phosphine Ligands, name is Allyldiphenylphosphine oxide, and the molecular formula is C15H19BO2, Recommanded Product: Allyldiphenylphosphine oxide.
Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia