The asymmetric total synthesis of glycinoeclepin A, a hatch-stimulating agent of the soybean cyst nematode, was accomplished on the basis of a cyclopentene annulation for constructing the CD ring m...
大豆胞囊线虫的孵化刺激剂甘氨酸环素 A 的不对称全合成是在环戊烯环化的基础上完成的,用于构建 CD 环...
Straightforward Enantioselective Synthesis of Both Enantiomers of Karahana Lactone Using a Domino Ring-Closure Sequence
作者:Jean-Marie Galano、Gérard Audran、Honoré Monti
DOI:10.1016/s0040-4020(00)00645-1
日期:2000.9
straightforward enantioselective synthesis of both enantiomers of karahana lactone is described starting from enantiopure (R) or (S)-4-hydroxy-3-methyl-cyclohex-2-en-1-one. The key step of the sequence is an acid-induced domino reaction with three pathways running. Because of the first description of karahana lactone as a solid, the structure was secured by X-ray structuralanalysis.
Chemoenzymatic Taxanes Approach Using Both Enantiomers of the Same Building Block. 2. Taxol CD Ring Unit
作者:Jean-Pierre Uttaro、Gérard Audran、Honoré Monti
DOI:10.1021/jo050039s
日期:2005.4.1
The enantioselective synthesis of the Taxol CD ring unit has been achieved starting from an enantiopure building block, the enantiomer of those previously utilized in the synthesis of the A ring unit. The key features of the present synthesis are astute use of both enantiomers of the same building block and complete control in the construction of five consecutive chiral centers.
Scalable Total Synthesis of Acremolactone B
作者:Mengyu Ba、Fengqi He、Lu Ren、William G. Whittingham、Peng Yang、Ang Li
DOI:10.1002/anie.202314800
日期:2024.7.15
Acremolactone B is a pyridine‐containing azaphilone‐type polyketide with herbicidal activity. We developed an aza‐6π electrocyclization−aromatization strategy to construct the tetrasubstituted pyridine ring and achieved the first total synthesis of this molecule on a gram scale. A bicyclic intermediate was expeditiously prepared by using [2 + 2] photocycloaddition and chemoselective Baeyer−Villiger oxidation, which was further elaborated to a densely substituted aza‐triene. An electrocyclization−aromatization cascade was exploited to forge the tetracyclic core of the natural product, and the side chain was introduced through diastereoselective acylation and reduction.