A Highly Stereoselective Synthesis of E-(But-1-en-3-yne-1-sulfonyl) hetarenes and Disubstituted 2-Benzothiazolyl Alkynes by Palladium Catalyzed Sonogashira Type Coupling of 2-Chlorovinylsulfones
A Highly Stereoselective Synthesis of E-(But-1-en-3-yne-1-sulfonyl) hetarenes and Disubstituted 2-Benzothiazolyl Alkynes by Palladium Catalyzed Sonogashira Type Coupling of 2-Chlorovinylsulfones
Efficient and selective syntheses of novel unsaturated chalcogen-containing pyridine derivatives
作者:Vladimir A. Potapov、Maria V. Musalova、Roman S. Ishigeev、Maxim V. Musalov、Vladimir A. Panov、Alfiya G. Khabibulina、Svetlana V. Amosova、Kuldip K. Bhasin
DOI:10.1016/j.tetlet.2016.10.066
日期:2016.11
Regio- and stereoselective syntheses of novel unsaturated chalcogen-containing pyridine derivatives [3-(vinylsulfanyl)- and 3-(vinylselanyl)-2H,3H-[1,3]thiazolo[3,2-a]pyridin-4-ium chlorides, ethyl 3-(2-pyridinylsulfanyl)-2-propenoate, 1-phenyl-3-(2-pyridinylsulfanyl)-2-propen-1-one, allenyl 2-pyridinyl telluride] have been developed using the previously unknown electrophilic and nucleophilic reactions
新型的不饱和含硫族元素的吡啶衍生物[3-(乙烯基硫烷基)-和3-(乙烯基硒基)-2 H,3 H- [1,3]噻唑并[3,2- a ]吡啶-4-的区域和立体选择性合成氯化铵,3-(2-吡啶基硫烷基)-2-丙烯酸乙酯,1-苯基-3-(2-吡啶基硫烷基)-2-丙烯-1-酮,烯丙基2-吡啶基碲化物]已经使用以前未知的亲电试剂进行了开发。 2-吡啶基硫烷基氯和2-吡啶硫属元素酸酯的亲核反应。
Novel Stereoselective Phase Transfer Catalytic Synthesis and Some Applications of ( E )-2-Chlorovinylthioarenes and Hetarenes
A novel two-step method for the preparation of (E)-2-chlorovinylthioarenes (or hetarenes) from thiols and 1,1,2-trichloroethane in the phase transfer catalytic systems solid K2CO3/solid KI/18-crown-6/xylene and solid KOH/18-crown-6/toluene has beendeveloped. (E)-2-chlorovinylthioarenes were isolated in yields up to 98%. Utilization of (E)-2-chlorovinylthioarenes in the Heck and Stille reactions has been shown.
The role of palladium catalyst and base in stereoselective transformations of ( E )-2-chlorovinylsulfides
Stereoselective transformations of 2-chlorovinylsulfides in the presence of soluble (t-BuOK) or insoluble (solid KOH or Cs2CO3/18-crown-6) base and palladium catalyst (dppb)Pd(OAc)(2) have been studied. Depending on the substrate or catalytic system, the reaction leads to the formation of (E)-1,2-bis[aryl(or arylmethyl)thio]ethenes and/or (E)-1,4-bis[aryl(or arylmethyl)thio]-1-buten-3-ynes in yields of up to 93%. (C) 2003 Elsevier Ltd. All rights reserved.