Formation of Ketenimines via the Palladium-Catalyzed Decarboxylative π-Allylic Rearrangement of <i>N</i>-Alloc Ynamides
作者:Juliana R. Alexander、Matthew J. Cook
DOI:10.1021/acs.orglett.7b02780
日期:2017.11.3
A new approach for the formation of ketenimines via a decarboxylative allylic rearrangement pathway that does not require strong stabilizing or protecting groups has been developed. The products can be readily hydrolyzed into their corresponding secondary amides or reacted with sulfur ylides to perform an additional [2,3]-Wittig process. Mechanistic studies suggest an outer-sphere process in which
Electrochemical Reduction of α-Amino Allenylphosphonates to α-Amino Allylphosphonates
作者:Pauline Adler、Pedro de Oliveira、Nicolas Rabasso
DOI:10.1002/ejoc.202000534
日期:2020.7.7
selective reduction of allenyl to allylphosphonates was achieved using an efficient electrochemical method. The reductionproducts are obtained in moderate to good yields. Moreover, in the case of tosylamine compounds, the unprotected amino‐allylphosphonates were accessed through a simultaneous reduction and cleavage of the tosyl group from the nitrogen atom. The mechanism of this reduction is also discussed
catalytic modes in organic synthesis. Herein, we report, a nickel-catalyzed, chemodivergent 1,1-alkynylboration, and 1,1-dialkynylation of unactivated α-olefins. This study not only provides an efficient and modular protocol for the divergent synthesis of propargylicboronicesters and gem-dialkynylalkanes, but also achieves a controllable, single or double cross-coupling of Ni/B bimetallic intermediates
Spirodienone lactams were prepared from the oxidation of α-amino allenylphosphonates or ynamido-phosphonates. The limitations observed for this synthesis were addressed by changing the nature of phosphorylated moiety.