Spliceostatin A 是一种有效的剪接体抑制剂,对多种人类癌细胞系表现出优异的抗癌活性。我们在此描述了剪接抑素A的稳定环丙烷衍生物的设计和合成。该合成涉及交叉复分解或Suzuki交叉偶联反应作为关键步骤。官能化环氧醇环由市售的光学活性三-O-乙酰基-d-葡萄糖构建。环丙基衍生物的生物学特性表明,它在人体细胞中具有活性,并且在体外抑制剪接的作用与剪接抑素 A 相当。
[EN] METHOD OF FORMING OSELTAMIVIR AND DERIVATIVES THEREOF<br/>[FR] PROCÉDÉ DE FORMATION D'OSELTAMIVIR ET DE SES DÉRIVÉS ET APPLICATIONS CORRESPONDANTES
申请人:UNIV NANYANG
公开号:WO2009078813A1
公开(公告)日:2009-06-25
A process is provided for the synthesis of 4,5-diamino cyclohexene carboxylate ester (1): or a pharmaceutically acceptable salt thereof. R1 - R3 are a silyl-, an aliphatic, alicyclic, aromatic, arylaliphatic, or an arylalicyclic group. R4, R11 and R12 are H, a silyl-group, an aliphatic, alicyclic, aromatic, arylaliphatic, or an arylalicyclic group. 3,4-Dihydropyran compound (9): with R5 and R6 being suitable protecting groups, is reacted to form aldehyde (4): which is oxidized and converted to N-substituted carbamate (3): with R7 being a suitable protecting group. (3) is, via oxazolinidone (13): converted to azido carboxylate ester (2): and then to 4,5-diamino cyclohexene carboxylate ester (1).
Substrate‐Controlled Cyclopropanation Reactions of Glycals with Aryl Diazoacetates
作者:Yujing Guo、Chao Pei、Rene M. Koenigs
DOI:10.1002/cctc.202000569
日期:2020.8.20
Cyclopropanation reactions of d‐glucal and d‐galactal derivatives with aryldiazoacetates can be conducted in a substrate‐controlled, stereoselective fashion using simple Rh(II) catalysts, which is further supported by DFT studies. Following this methodology, sugar‐derived, donor‐acceptor cyclopropanes can be accessed that allow stereoselective O‐glycosylationreactions.
A stereodivergent synthesis of β- and α-O-glycosides using 3-O-quinaldoyl glucals was developed by palladium catalysis at 60 and 110 °C respectively. Various alcohols, monosaccharides, and aminoacid were glycosylated to form β- and α- products in good yields with high stereoselectivity. Mechanistic studies indicated no classic Pd–N (quinoline) coordination, but π–π stacking interactions promoted the