of epothilone A via organoboranes have been described. A modified procedure for the large-scale preparation of B-gamma,gamma-dimethylallyldiisopinocampheylborane from prenyl alcohol has been developed. This reagent, upon reaction with various aldehydes, provides the corresponding alpha,alpha-dimethylhomoallylic alcohols in high enantioselectivities. The application of this reagent for the synthesis of
Aminofluorosulfonylation of <i>β,γ</i>-Unsaturated Hydrazones with Sulfur Dioxide and <i>N</i>-Fluorobenzenesulfonimide: Accessing Pyrazoline-Functionalized Aliphatic Sulfonyl Fluorides
作者:Zhi-Min Yan、Lin Qi、Tong-Yang Cao、Jia-Li Liu、Hui-Jie Du、Yi-Chen Dong、Wei Li、Li-Jing Wang
DOI:10.1021/acs.orglett.3c01278
日期:2023.6.2
An efficient aminofluorosulfonylation strategy was developed for the synthesis of various pyrazoline-functionalized aliphatic sulfonyl fluorides using β,γ-unsaturated hydrazones with sulfur dioxide and NFSI as the starting materials under mild conditions. The sulfonyl fluoride products could be successfully transformed into the corresponding sulfonate esters and amides via the sulfur(VI) fluoride exchange
Epotriazole: Exploiting the amide-triazole bioisosterism, in this work we report the synthesis of the first generation of epothilones lacking the macrolide or azalide structure, with the ester or amide linkage replaced by a triazole unit.