Electrotelluration: A New Approach to Tri- and Tetrasubstituted Alkenes
作者:Joseph P. Marino、Hanh Nho Nguyen
DOI:10.1021/jo0110146
日期:2002.9.1
described in which a Michael addition of an alkyl or aryl tellurolate anion occurs onto an activated alkyne with subsequent trapping of a vinyl anion with electrophiles (aldehydes and ketones) other than a proton. This process provides an efficient regio- and stereospecific route to tri- and tetrasubstitutedalkenes. Methodologically significant examples of this chemistry were studied in which aryl and alkyl
Palladium-Catalyzed Additions of Terminal Alkynes to Acceptor Alkynes
作者:Barry M. Trost、Mark T. Sorum、Chuen Chan、Gerd Rühter
DOI:10.1021/ja9624937
日期:1997.1.1
The development of addition reactions wherein the product is the simple sum of the reactants plus anything else (only needed catalytically) constitutes an important goal for enhanced synthetic efficiency. The C−H bond of terminalalkynes (the donor alkynes) can be added to either terminalalkynes (self-coupling) or activated internal alkynes (cross-coupling) (the acceptor alkynes) in the presence of
Dimerisation d'octyne-1, methyl-2 butyne-3ol-2 et butyne-3 dicarboxylate-1,1 de dimethyle et codimerisation entre le butyne-2oate de methyle ou la (phenyl propynyl) sulfone et des composes acetyleniques en presence d'acetate de Pd(II)-triphenylphosphine
Dimerisation d'octyne-1,methyl-2 butyne-3ol-2 et butyne-3 dicarboxylate-1,1 dedimethyle et codimerisation entre le butyne-2oate demethyle ou la (phenyl propynyl) sulfone et des composes acetyleniques en d'醋酸脱钯(II)-三苯基膦
Trifluoromethyl Nonaflate: A Practical Trifluoromethoxylating Reagent and its Application to the Regio‐ and Stereoselective Synthesis of Trifluoromethoxylated Alkenes
作者:Zhichao Lu、Tatsuya Kumon、Gerald B. Hammond、Teruo Umemoto
DOI:10.1002/anie.202104975
日期:2021.7.12
The trifluoromethoxy group has elicited much interest among drug and agrochemical discovery teams because of its unique properties. We developed trifluoromethyl nonafluorobutanesulfonate (nonaflate), TFNf, an easy-to-handle, bench-stable, reactive, and scalable trifluoromethoxylating reagent. TFNf is easily and safely prepared in a simple process in large scale and the nonaflyl part of TFNf can easily
Cu(OAc)<sub>2</sub> Mediated Synthesis of 3-Sulfonyl Chromen-4-ones
作者:Meng-Yang Chang、Yu-Hsin Chen、Heui-Sin Wang
DOI:10.1021/acs.joc.8b00177
日期:2018.2.16
Copper acetate mediated (4 + 2) annulation of sulfonylacetylenes with salicylic acids provides sulfonyl chromen-4-ones in the presence of benzotriazol-1-yloxy tri(dimethylamino)phosphonium hexafluorophosphate (BOP, Castro’s reagent) and 4-dimethylaminopyridine (DMAP) in MeNO2 at reflux for 3 h. The uses of various metal complexes and activating reagents are investigated for facile and efficient transformation