[GRAPHICS]The diphenylmethyl amino protecting group can be efficiently removed by initial oxidation of the amine to an imine by 2,3-dichloro-5,6-dicyanobenzoquinone. The resulting imine can then be easily hydrolyzed under mildly acidic conditions. This method is particularly well suited for the preparation of alpha-amino phosphinates and alpha-amino phosphonates.
Tropyliumion mediated α-cyanation of amines is described. Even in the presence of KCN, tropyliumion is capable of oxidizing various amine substrates, and the resulting iminium ions undergo salt metathesis with cyanide ion to produce aminonitriles. The byproducts of this transformation are simply cycloheptatriene, a volatile hydrocarbon, and water-soluble potassium tetrafluoroborate. Thirteen total
Hullot,P.; Cuvigny,T., Bulletin de la Societe Chimique de France, 1973, p. 2989 - 2992
作者:Hullot,P.、Cuvigny,T.
DOI:——
日期:——
Efficient Transamination under Mild Conditions: Preparation of Primary Amine Derivatives from Carbonyl Compounds <i>via</i> Imine Isomerization with Catalytic Amounts of Potassium <i>tert</i>-Butoxide
1,3-Prototropic rearrangement of N-diphenylmethanimines was successfully performed with a catalytic amount of potassium tert-butoxide. This procedure can also be used with aliphatic and aromatic aldimines and was extended to the isomerization of (1R)-camphorquinone monoimine and N-(4-methoxyphenyl)-4-phenyl-3-iminoazetidin-2-one. The isomerized imines were easily hydrolyzed and isolated as Cbz derivatives.
KAUFFMANN T.; BERG H.; KOEPPELMANN E.; KUHLMANN D., CHEM. BER. <CHBE-AM>, 1977, 110, NO 7, 2659-2664
作者:KAUFFMANN T.、 BERG H.、 KOEPPELMANN E.、 KUHLMANN D.