AgAsF6 as safe alternative to AgClO4 for generating cationic zirconocene species: Utilities in lewis acid-promoted selective CC bond forming reactions
synthesis, AgAsF6 proved to be an efficient catalyst that serves as a safe alternative to AgClO4. Scope and limitation is discussed on this new catalyst in the processes including (1) alkyl/alkenyl transfer reaction from organozirconocene chloride to aldehyde, (2) two- and four-carbon homologation of aldehyde, (3) dual synthetic methods of 1,3-dienes from aldehydes/ketones via 1,3-bimetallic species
Deaminative Addition of Alkylpyridinium Salt to Aldehyde
作者:Yu Huang、Zhengqiang Liu、Wenbo H. Liu
DOI:10.1021/acs.orglett.3c01724
日期:2023.7.7
Here we show that a primary amine can engage in the nucleophilic addition to an aldehyde to synthesize an alcohol following preactivation of the amine. The enabling reagent for this radical-polar crossover process is CrCl2. This reaction is selective for aldehydes and compatible with numerous functional groups, which are not tolerated under classical Grignard-type conditions. Complementary to the well-established
Nucleophilic addition of alkenylzirconocene chloride [Cp2Zr(Cl)CH=CHR] to aldehyde, which is ordinarily a slow reaction, is remarkably accelerated by a catalytic amount of AgClO4. The rate acceleration effect is also valid for the alkyl congener, Cp2Zr(Cl)R.