An Olefination Entry for the Synthesis of Enantiopure α,ω-Diaminodicarboxylates and Azabicyclo[<i>X</i>.<i>Y</i>.0]alkane Amino Acids
作者:Francis Gosselin、William D. Lubell
DOI:10.1021/jo9814602
日期:1998.10.1
beta-keto phosphonates 21-23. The power of this approach for making azabicyclo[X.Y.0]alkane amino acid was then illustrated by the first synthesis of enantiopure indolizidin-9-one amino acid 2 in nine steps and >25% overall yield from inexpensive aspartic acid as chiral educt. Hydrogenation of (2S,8S)-di-tert-butyl 4-oxo-2,8-bis[N-(PhF)amino]non-4-enedioate (24) in 9:1 EtOH:AcOH furnished a 9:1 diastereomeric
合成各种链长的α,ω-二氨基二羧酸酯的新方法为制备一系列不同环尺寸的氮杂双环[XY0]烷烃氨基酸开辟了道路。通过将二甲基甲基膦酸锂阴离子加到α-叔丁基N-(PhF)天冬氨酸3,谷氨酸9和α-叔丁基的ω-甲基酯中,以71-90%的产率合成β-酮膦酸酯21-23氨基己二酸酯12(PhF = 9-苯基芴-9-基)。α-叔丁基N-(PhF)天门冬氨酸β-醛(5)的霍纳-沃兹沃思-埃蒙斯烯化反应制备了9至11个碳链长度的α,ω-二氨基二羧酸24-26,产率为78-87%氨基二羧酸酯衍生的β-酮膦酸酯21-23。这种方法的作用是制造氮杂双环[XY 然后,通过九个步骤的对映纯纯的吲哚izidin-9-一个氨基酸2的首次合成和廉价的天冬氨酸作为手性离析物的总收率> 25%,来说明[0]烷烃氨基酸。在9:1的EtOH:AcOH中氢化(2S,8S)-二叔丁基4-oxo-2,8-双[N-(PhF)氨基]非-4-烯二酸酯(24)