(dimethylsilyl)acetonitriles (Me2HSiCR3R4CN) react spontaneously with aldehydes in DMSO to give β-hydroxynitriles in good to high yields. The addition to ketones is effectively promoted by using MgCl2 or CaCl2. (Dimethylsilyl)acetonitrile (Me2HSiCH2CN) shows lower reactivity than the α-alkylated analogues. However, the parent reagent adds efficiently to aldehydes and ketones under catalysis by AcOLi or MgCl2.
Electroreduction of gamma and delta-cyano ketones in i-PrOH with Sn cathode gave alpha-hydroxy ketones and their dehydroxylated ketones as the intramolecularly coupled products. Guaiazulene, (-)-valeranone, polyquinanes, dihydrojasmone, methyl dihydrojasmonate, and rosaprostol have been synthesized by utilizing this electroreductive intramolecular coupling of gamma and delta-cyano ketones in one of the key steps. Similarly, electroreduction of a mixture of ketone and nitrile gave the corresponding intermolecularly coupled product. The product obtained by the electroreductive intermolecular coupling of (+)-dihydrocarvone with acetonitrile has been found to be the precursor of an effective chiral ligand for the enantioselective addition of diethylzinc to aldehydes.
Recherches sur les alcoylamidures de lithium. Synthèse de β hydroxy nitriles
作者:T. Cuvigny、P. Hullot、M. Larcheveque
DOI:10.1016/s0022-328x(00)86577-8
日期:1973.9
BELLASSOUED M.; DARDOIZE F.; FRANGIN Y.; GAUDEMAR M., J. ORGANOMETAL. CHEM., 1979, 165, NO 1, 1-8
作者:BELLASSOUED M.、 DARDOIZE F.、 FRANGIN Y.、 GAUDEMAR M.