An Efficient Synthesis of Dinitrile Derivatives by the Reaction of Oxime Esters or Acid Anhydrides with Cyanotrimethylsilane Catalyzed by La(O<i><sup>i</sup></i>Pr)<sub>3</sub>
作者:Akiko Fujii、Satoshi Sakaguchi、Yasutaka Ishii
DOI:10.1021/jo0055281
日期:2000.9.1
the formation of acyl cyanides as intermediates, followed by the addition of Me(3)SiCN to them. Additionally, the reaction of aceticanhydride with Me(3)SiCN catalyzed by La(O(i)()Pr)(3) gave 1-trimethylsilyloxyethane dinitrile. Thus, various alpha-trimethylsilyloxydinitriles were synthesized in good yields by allowing oxime esters or acid anhydrides to react with Me(3)SiCN in the presence of a catalytic
Arylmalononitriles were prepared from the corresponding benzoyl chlorides by three reaction steps . Treatment of the starting substances with cyanotrimethylsilane in the presence of pyridine gave dicyanotrimethylsiloxymethylbenzenes, which were transformed into chlorodicyanomethylbenzenes with POCl3-pyridine in the second step. Finally, reduction of chlorodicyanomethylbenzenes with Zn–CH3CO2H afforded