One-Step Preparation of Pyrrolo[1,4]benzodiazepine Dilactams: Total Synthesis of Oxoprothracarcin, Boseongazepines B and C
作者:Ronalds Zemribo、Gints Smits
DOI:10.1055/s-0034-1378877
日期:——
A one-step synthesis of pyrrolo[1,4]benzodiazepine dilactams has been developed. The high yielding method involvesdirect coupling of unprotected anthranilic acids with proline esters. This transformation was successfully applied in the first total syntheses of boseongazepines B and C as well as oxoprothracarcin and limazepine E.
吡咯并[1,4] 苯并二氮杂二内酰胺的一步合成已被开发出来。高产方法涉及将未保护的邻氨基苯甲酸与脯氨酸酯直接偶联。这种转化成功地应用于第一次全合成 Boseongazepines B 和 C 以及oxoprothracarcin 和 limazepine E。
The Exocyclic Olefin Geometry Control via Ireland–Claisen Rearrangement: Stereoselective Total Syntheses of Barmumycin and Limazepine E
作者:Gints Smits、Ronalds Zemribo
DOI:10.1021/ol4019453
日期:2013.9.6
total syntheses of Limazepine E and Barmumycin, potent, naturally occurring antitumor agents, are described. The total syntheses control the olefin geometryvia a highly selective chelation-controlled Ireland–Claisen rearrangement of a seven-membered lactone-derived boron enolate for the synthesis of (E)-4-ethylidene proline, a crucial building block for a number of natural products.