Rigid Dipeptide Surrogates: Syntheses of Enantiopure Quinolizidinone and Pyrroloazepinone Amino Acids from a Common Diaminodicarboxylate Precursor
作者:Francis Gosselin、William D. Lubell
DOI:10.1021/jo991766o
日期:2000.4.1
phosphonate 12 (PhF = 9-phenylfluoren-9-yl). The practicality of this approach for making azabicyclo[X.Y.0]alkane amino acids was then illustrated by the first synthesis of enantiopure quinolizidin-2-one amino acid 6 in seven steps and 40% overall yield from L-pyroglutamic acid. Hydrogenation of delta-keto alpha,omega-diaminosebacate 18, followed by lactam cyclization and protection, gave quinolizidin-2-one
作为模拟不同肽构象的手段,已经开发了一种通用且实用的方法,该方法可从普通的二氨基二羧酸酯前体合成不同环尺寸的氮杂双环[XY0]烷烃氨基酸。首先在(18)中制备(2S,9S)-1-叔丁基10-苄基5-氧代-2- [N-(PhF)氨基] 9- [N-(BOC)氨基]癸-4-烯二酸酯(18)。 N-(PhF)天门冬氨酸β-醛8与焦谷氨酸衍生的β-酮膦酸酯12(PhF = 9-苯基芴基-9-基)的Horner-Wadsworth-Emmons烯烃的83%收率。然后,通过七个步骤的对映体纯的喹喔啉-2-酮氨基酸6的首次合成和L-焦谷氨酸的总产率的40%,说明了该方法用于制备氮杂双环[XY0]烷烃氨基酸的实用性。氢化δ-酮基α,ω-二氨基葡萄糖酸酯18,然后内酰胺环化和保护,得到喹喔啉丁-2-一氨基酸6,为单一非对映异构体。接下来通过吡咯并ze庚因-2-1氨基酸6的两种环稠合异构体的合成以11个步骤和