Cyanotrimethylsilane adds to some ⇌,β-unsaturated ketones in conjugate manner under the catalytic action of Lewis acids such as triethylaluminium, aluminiumchloride, and SnCl2. Hydrolysis of the products gives β-cyano ketones which are identical to the hydrocyanated products of the starting enones. The title silicon reagent reacts with acetals and orthoesters under the catalytic action of SnCI2 or BF3-OEt2
The conversion of 2,5-anhydro-d-allononitrile derivatives by a nitrile hydratase from Rhodococcus rhodochrous IFO 15564 was studied. The activity of the enzyme was strongly effected by the steric bulkiness of the substituents at the 3-position of the substrates, and the corresponding amides were obtained in high yields from the nitriles with free hydroxyl groups at the 3- and 4-positions.
Trimethylsilyl cyanide promoted cyanation of tertiary alkyl chlorides and other SN1 active compounds
作者:Manfred T. Reetz、Ioannis Chatziiosifidis、Hermann Künzer、Hans Müller-Starke
DOI:10.1016/s0040-4020(01)88594-x
日期:1983.1
Tertiary chlorides are readily cyanated in a one-pot procedure using trimethylsilyl cyanide in the presence of SnCl4. The mechanism of this novel and synthetically useful reaction involves initial isonitrile formation followed by rearrangement to the tertiary nitrile. Other SN1 active componds also undergo smooth cyanation.