An enantioselective sulfa‐Michael‐cyclization reaction was developed for the synthesis of 1,5‐benzothiazepines with versatile pharmacological activities. The reaction between 2‐aminothiophenol and α,β‐unsaturated pyrazoleamides gave direct access to N−H‐free 1,5‐benzothiazepines in the presence of a chiral N,N′‐dioxide/Yb(OTf)3 complex. Excellent enantioselectivities (up to 96 % ee) and high yields
[EN] ENANTIO- AND STEREO-SPECIFIC SYNTHESES OF ß-AMINO-a- HYDROXY AMIDES<br/>[FR] SYNTHÈSES ÉNANTIO- ET STÉRÉOSPÉCIFIQUES DE ?-AMINO-?-HYDROXYAMIDES
申请人:SCHERING CORP
公开号:WO2011014494A1
公开(公告)日:2011-02-03
Processes useful for the preparation of a Compound of Formula I: Formula (I). Intermediates useful for the preparation of the compound of Formula I, and processes useful for preparing said intermediates are disclosed.
Water-initiated hydrocarboxylation of terminal alkynes with CO<sub>2</sub> and hydrosilane
作者:Meng-Meng Wang、Sheng-Mei Lu、Kumaraswamy Paridala、Can Li
DOI:10.1039/d0cc06320g
日期:——
This work discloses a Cu(II)–Ni(II) catalyzed tandem hydrocarboxylation of alkynes with polysilylformate formed from CO2 and polymethylhydrosiloxane that affords α,β-unsaturated carboxylic acids with up to 93% yield. Mechanistic studies indicate that polysilylformate functions as a source of CO and polysilanol. Besides, a catalytic amount of water is found to be critical to the reaction, which hydrolyzes
Total synthesis of thioamycolamide A <i>via</i> a biomimetic route
作者:Chengqian Pan、Takefumi Kuranaga、Hideaki Kakeya
DOI:10.1039/d0ob01942a
日期:——
cytotoxic cyclic microbial lipopeptide that bears a D-configured thiazoline, a thioether bridge, a fatty acid side chain, and a reduced C-terminus. Based on the biosynthetic insights, a concise totalsynthesis of thioamycolamide A was accomplished.
Thioamycolamide A 是一种生物合成上独特的细胞毒性环状微生物脂肽,具有D构型的噻唑啉、硫醚桥、脂肪酸侧链和还原的 C 末端。基于对生物合成的了解,完成了硫代淀粉酰胺 A 的简明全合成。