Chiral imines (-)- and (+)-8a, prepared from aminoacetonitrile and (-)- or (+)-1-hydroxypinanones, reacted with E- and Z-1,4-dichlorobut-2-enes 1 in the presence of (S)- or (R)-BINAP palladium(0) complexes to produce the diastereoselectively pure 1-amino-2-vinylcyclopropane carbonitrile E-13a, suitable precursor of ACCs. However subsequent Pd(0) induced reversible ring opening of the vinylcyclopropane moiety seems responsible for the low enantiomeric excesses obtained (≤32% ee).
由
氨基乙腈和(-)或(+)-1-羟基
蒎烷酮制备的手性
亚胺(-)和(+)-8a,在与(S)或(R)-BINAP
钯(0)配合物存在下,与E和Z-1,4-二
氯丁-2-烯1反应,以高度对映选择性纯的形式生成1-
氨基-2-
乙烯基环丙烷氰化物E-13a,这是一种适合生成ACCs的前体。然而,随后的Pd(0)引发的
乙烯基环丙烷单元可逆环打开似乎是导致获得的低对映体过剩(≤32% ee)的原因。