4,5-Didehydro-7-silyloxymethyl-2-oxepanone and formal total syntheses of Hagen’s gland lactones and trans-kumausynes
作者:Divya Agrawal、Vardhineedi Sriramurthy、Veejendra K. Yadav
DOI:10.1016/j.tetlet.2006.08.059
日期:2006.10
A concise and enantiospecific route to the 2,6-dioxabicyclo[3.3.0]octan-3-one ring system from commercially available (R)-(+)- and (S)-(−)-glycidols is described. The key features involve ring closing metathesis to construct the 7-substituted-4,5-dehydro-2-oxepanone and its base-catalyzed single-step rearrangement into the 2,6-dioxabicyclo[3.3.0]octan-3-one skeleton. Using this strategy, formal total
描述了从可商购获得的(R)-(+)-和(S)-(-)-糖醇到2,6-二氧杂双环[3.3.0] octan-3-one环系统的简洁和对映体特异性路线。关键特征包括闭环易位,以构建7-取代的4,5-脱氢-2-氧杂戊酮及其碱催化的单步重排反应,形成2,6-二氧杂双环[3.3.0] octan-3-one骨架。使用该策略,已经实现了(7 R)-顺式-Hagen腺内酯和(+)-和(-)-反式-kumausynes的正式合成。