Diastereoselectivity Enhancement in the 1,3-Cycloaddition of β-Lactam Aldehydes. Application to the Synthesis of Enantiopure Indolizidinone Amino Esters
作者:Benito Alcaide、Pedro Almendros、María C. Redondo、M. Pilar Ruiz
DOI:10.1021/jo051402y
日期:2005.10.1
Enantiopure α-alkoxy β-lactam acetaldehydes were prepared via the thiazole-based one-carbon homologation. The 1,3-dipolar cycloaddition reaction involving α-alkoxy β-lactam acetaldehyde-derived azomethine ylides gave with excellent diastereoselectivity highly functionalized 2-azetidinone-tethered prolines, which were directly used for the first preparation of azabicyclo[4.3.0]nonane (indolizidinone)
通过基于噻唑的一碳同系物制备对映体纯的α-烷氧基β-内酰胺乙醛。由α-烷氧基β-内酰胺乙醛衍生的甲亚胺基团进行的1,3-偶极环加成反应具有极佳的非对映选择性,高度官能化的2-氮杂环丁酮系链的脯氨酸,可直接用于氮杂双环[4.3.0]壬烷的首次制备( β-内酰胺类的氨基吲哚酮)。