Synthesis of α-phenylselanyl and α-phenylsulfanyl nitriles from aldehyde N,N-dialkylhydrazones
作者:Michaël Ternon、Xavier Pannecoucke、Francis Outurquin、Claude Paulmier
DOI:10.1016/s0040-4020(02)00232-6
日期:2002.4
dimethylhydrazones 1 (R2=H) and derived from linear aliphatic aldehydes, has led to α-phenylselanyl hydrazones 2. α-Phenylselanyl nitriles 3 were, however, isolated when an excess of base and of PhSeX (X=Cl, Br) were used. Hydrazones 1 bearing an α-alkyl substituent (R2≠H) gave also nitriles 3. SAMP-hydrazones 4 showed the same reactivity and the corresponding nitriles 3 were obtained in a racemic form. The use of
azaenolates的Phenylselenenylation,通过LDA处理dimethylhydrazones形成1(R 2 = H),并从直链脂族醛衍生的,已经导致α-phenylselanyl腙2。但是,当使用过量的碱和PhSeX(X = Cl,Br)时,会分离出α-苯基硒基腈3。腙1轴承α-烷基取代基(R 2 ≠H),得到也腈3。SAMP-腙4显示了同样的反应性和相应的腈3外消旋形式得到。用PhSCl代替PhSeBr可以从1生成α-苯硫基腈6衍生自α-支化醛(R 2 ≠H)。