Divergent Routes to Chiral Cyclobutane Synthons from (−)-α-Pinene and Their Use in the Stereoselective Synthesis of Dehydro Amino Acids
作者:Albertina G. Moglioni、Elena García-Expósito、Gemma P. Aguado、Teodor Parella、Vicenç Branchadell、Graciela Y. Moltrasio、Rosa M. Ortuño
DOI:10.1021/jo991773c
日期:2000.6.1
suitable phosphonates. These reactions are highly stereoselective, affording exclusively (Z) isomers, stereochemistry being assessed by NMR experiments. The obtained dehydro amino acids are polyfunctionalized molecules useful for the synthesis of other alpha-amino acids, with additional chiral centers, whose configuration must be induced by the chirality of the terpene employed as a precursor.
已经使用商业(-)-α-pine烯和(-)-马来酮作为手性前体合成了几种多官能化的环丁烷衍生物。因此,通过使用三氯化钌对这些化合物的氧化裂解,在没有差向异构的情况下分别定量地提供了(-)-顺-品酸和(-)-顺-品酸。这些产物被转化成几种类型的醛,它们是通过Wittig-Horner与合适的膦酸酯缩合合成环丁烷脱氢氨基酸的关键中间体。这些反应是高度立体选择性的,仅提供(Z)异构体,通过NMR实验评估立体化学。获得的脱氢氨基酸是多官能团分子,可用于合成其他具有其他手性中心的α-氨基酸,