Metathesis Cascade‐Triggered Depolymerization of Enyne Self‐Immolative Polymers**
作者:Jingsong Yuan、Gavin J. Giardino、Jia Niu
DOI:10.1002/anie.202108239
日期:2021.11.15
of enyne self-immolative polymers (SIPs) capable of metathesis cascade-triggered depolymerization is reported. Studies on modelcompounds established 1,6-enyne structures for efficient metathesis cascadereactions. SIPs incorporating the optimized 1,6-enyne motif were prepared via both polycondensation and iterative exponential growth approaches. These SIPs demonstrated excellent stability in strong
Dearomatizing Spiroannulation Reagents: Direct Access to Spirocycles from Indoles and Dihalides
作者:John T. R. Liddon、James A. Rossi-Ashton、Richard J. K. Taylor、William P. Unsworth
DOI:10.1021/acs.orglett.8b01248
日期:2018.6.1
Unfunctionalized indoles can be directly converted into 3,3′-spirocyclic indolenines and indolines upon reaction with electrophilic dihalides in the presence of t-BuOK/BEt3. This double C–C bond forming reaction, which simultaneously generates a quaternary spirocyclic center, typically proceeds in high yield and has good functional group tolerance. In contrast to existing dearomatizing spirocyclization
在t -BuOK / BEt 3存在下,与亲电二卤化物反应时,未官能化的吲哚可直接转化为3,3'-螺环吲哚和二氢吲哚。这种双CC键形成反应,同时生成一个季螺环中心,通常以高收率进行并且具有良好的官能团耐受性。与现有的脱芳香化螺环化方法相比,不需要制备预官能化的芳香族前体,从而能够一步一步从简单的可商购的芳香族化合物中快速获得有价值的螺环产品。
Ionic Liquid as Catalyst and Reaction Medium: A Simple, Convenient and Green Procedure for the Synthesis of Thioethers, Thioesters and Dithianes using an Inexpensive Ionic Liquid, [pmIm]Br
作者:Brindaban C. Ranu、Ranjan Jana
DOI:10.1002/adsc.200505122
日期:2005.11
room temperature ionicliquid, 1-pentyl-3-methylimidazolium bromide, [pmIm]Br efficiently catalyzes the reaction of alkyl halides or acyl halides with thiols without any solvent at room temperature leading to the synthesis of thioethers and thioesters in high yields. This reaction has also been extended for the preparation of dithianes and transthioetherification. The ionicliquid is recovered and
Synthesis and Reactivity of -Electron-Deficient (Arylsulfonyl)acetates
作者:Diego A. Alonso、Carmen Nájera、Montserrat Varea
DOI:10.1002/hlca.200290013
日期:2002.12
(arylsulfonyl)acetates 9 were synthesized (Scheme 1, Table 1), and their behavior as soft nucleophiles in the dialkylation reaction under phase-transfer catalysis conditions was studied (Schemes 2 and 3, Tables 2 and 3). The [3,5-bis(trifluoromethyl)phenyl]sulfonyl group was shown to be the best substituent for the stereoselectivesynthesis of (E)-aconitates 18via an alkylation hydro-sulfonyl-elimination integrated