Palladium-Catalyzed Decarboxylative Coupling of Alkynyl Carboxylic Acids and Alkenyl Tosylates for the Synthesis of Enynones
作者:Subeen Yu、Eunjeong Cho、Jimin Kim、Sunwoo Lee
DOI:10.1021/acs.joc.7b02175
日期:2017.10.20
A palladium-catalyzed decarboxylativecoupling reaction was developed for the synthesis of 3-(1-alkynyl)-2-cyclohexen-1-ones. A variety of alkynyl carboxylic acids were coupled with 3-oxocyclohexenyl tosylates to afford the corresponding enynones in good to excellent yields. The developed catalytic system is phosphine free and showed good tolerance toward various functionalities such as chloride, cyano
Formation of meta-arylsulfanyl- and meta-(alkylsulfanyl)phenols from cyclohexane-1,3-diones
作者:Nhan Do Van Thanh、Subrata Patra、Derrick L.J. Clive
DOI:10.1016/j.tet.2018.06.059
日期:2018.8
respectively. These compounds are easily brominated at C-2 by using NBS in MeCN; exposure to DBU in MeCN at room temperature then causes aromatization to afford meta-arylsulfanyl- and meta-(alkylsulfanyl)phenols.
环己烷-1,3-二酮与TsCl / Et 3 N的反应,然后在MeCN中用芳基或烷基硫醇和K 2 CO 3处理所得的3-(甲苯磺酰氧基)环己-2-烯-1-酮(芳基硫烷基)环己-2-烯-1-酮或3-(烷基硫基)环己-2-烯-1-酮。通过在MeCN中使用NBS,这些化合物很容易在C-2处溴化;暴露于DBU在MeCN在室温下然后使得芳构化,得到的元-arylsulfanyl-和元- (烷硫基)苯酚。
An Easy, Stereoselective Synthesis of Hexahydroisoindol-4-ones under Phosphine Catalysis
A new synthetic approach to hexahydroisoindol-4-ones is reported, based on the formal [3+2] cyclization reaction between N-arylsulfonylimines and cyclic conjugated dienes, under phosphine catalysis. Key substrates are 3-vinylcyclohex-2-enones with electron-withdrawing substituents (ester, amido, cyano, phosphoryl and keto groups) on the exocyclic doublebond, which afford the three-atom synthons for
Enantioselective allene/enone photocycloadditions: The use of an inexpensive optically active 1,3-disubstituted allene
作者:Mary S. Shepard、Erick M. Carreira
DOI:10.1016/s0040-4020(97)01013-2
日期:1997.12
and use of an inexpensive readily prepared opticallyactive 1,3-disubstituted allene that may be utilized for enantioselective intramolecular allene/enone photocycloadditions. In addition, we describe novel substrates for intramolecular [2+2] photocycloadditions which substantially expand the scope of the process to include amino- and thio- tethered allene/enones.
We report herein a highly exo-selectiveintramolecularDiels–Alderreaction of alkenyl boronates which employs an N–B dative bond-involved bicyclic rigid tether. Complex C(sp3)-rich polycyclic molecules containing up to 8 stereocenters can be readily formed via an operationally simple two-step procedure.