Regiochemistry in alkylation, acylation and methoxycarbonylation of alkali salts from 2-substituted alkenylpropanedinitriles
作者:Hege Karlsen、Pål H. Songe、Lise Kristin Sunsby、Lise Cathrine Hagen、Per Kolsaker、Christian Rømming
DOI:10.1039/b009175h
日期:——
6-diphenyl-2H-pyran-3-carbonitrile 12, while excess of benzoyl chloride gives the double-acylation product, (Z)-4,4-dicyano-1,3-diphenylbuta-1,3-dienyl benzoate (Z)-13, for which the X-ray structure is presented. Acylation of 4a− with acetyl chloride gives both regioisomers; the 1-acylated product evaded isolation, and the 3-acylation product reacted further to give the (E)- and (Z)-form of 4,4-dicyano-1
碱金属盐(4 - )几个2-取代alkenylpropanedinitriles的制备,分离和表征通过1个H和13 C NMR光谱。通过处理该盐4A -与图4a的二聚体,2-氰基亚甲基-6-甲基-4,6-二苯基-1,2,5,6- tetrahydronicotinonitrile 6,被形成,为此,单晶X射线结构是呈现。烷基化所述两可的盐的4 -与MEX(X = I,TF,或Br)导致区域异构体,1-和3-烷基化,并带O比较对 C-烷基化 的 酮类被制造。双倍的烷基化还观察到,先进行3-烷基化,再进行1-烷基化。因此,从图4a - (的混合物ë) -和(Ž)-2-甲基-2-(1-苯基丙-1-烯基)丙二图9b形成,且前者的X射线结构被呈现。酰化的4A -用苯甲酰氯仅给出3-区域异构体;使用等摩尔量的反应物会产生闭环产物,2-氧代-4,6-二苯基-2 H-吡喃-3-甲腈 12,而多余的苯甲酰氯给出了双酰化产物,(Ž)-4