作者:Yuji Kaiya、Jun-ichi Hasegawa、Takayuki Momose、Takaaki Sato、Noritaka Chida
DOI:10.1002/asia.201000602
日期:2011.1.3
natural product were established by stereoselective functionalization of a D‐arabinose scaffold, including an Overman rearrangement to generate a highly congested tetrasubstituted carbon center. One of the definitive reactions in the synthesis was a Lewis acid mediated skeletal rearrangement of a pyranose structure, which enabled the practical conversion of the carbohydrate scaffold to the γ‐lactam structure
详细介绍了我们的第二代salinosporamide A的合成。天然产物中存在的γ-内酰胺结构中的三个连续立体中心是通过D-阿拉伯糖支架的立体选择性官能化而建立的,包括Overman重排以产生高度拥挤的四取代碳中心。合成过程中的确定性反应之一是路易斯酸介导的吡喃糖结构的骨架重排,这使糖类支架得以实际转化为嵌入salinosporamide A中的γ-内酰胺结构。使用苄基酯作为保护基由于位阻羧酸在合成结束时导致了一锅全局脱保护。