Electrochemical reduction of dehydroamino acids: synthesis and photophysical properties of β,β-diarylalanines
作者:Paula M.T. Ferreira、Luís S. Monteiro、Elisabete M.S. Castanheira、Goreti Pereira、Carla Lopes、Helena Vilaça
DOI:10.1016/j.tet.2010.10.087
日期:2011.1
Several β,β-disubstituted dehydroalanines were prepared from β,β-dibromo or β-bromo, β-substituted dehydroalanines and aryl boronic acids using a Suzuki–Miyaura cross-coupling reaction. The electrochemical behaviour of these compounds was studied by cyclic voltammetry. All compounds studied showed similar reduction potentials and these were similar to the peak potential of the methyl ester of N-tert-butoxycarbonyl
使用Suzuki-Miyaura交叉偶联反应,由β,β-二溴或β-溴,β-取代的脱氢丙氨酸和芳基硼酸制备了几种β,β-二取代的脱氢丙氨酸。通过循环伏安法研究了这些化合物的电化学行为。所有化合物所研究显示了相似的还原电位和这些类似于的甲酯的峰电位Ñ -叔丁氧羰基dehydrophenylalanine。因此,脱氢丙氨酸支架中第二芳基部分的存在不会显着改变还原电位。 在存在三乙基氯化铵作为质子供体的情况下,在阴极峰值电势下进行受控电势电解。分离出的高至高收率的唯一产物是相应的β,β-二芳基丙氨酸。该反应也使用含有β,β-二芳基脱氢丙氨酸的二肽进行,得到还原产物的1∶1非对映异构体混合物。 在三种不同极性的溶剂中研究了两种β,β-二芳基脱氢丙氨酸和相应的β,β-二芳基丙氨酸的光物理性质。的β,β-diaryldehydroalanines显示出低的荧光量子产率(Φ ˚F <9%),由于与α,β双