Kinetics of decarboxylation of the two epimers of 5-tert-butyl-1-methyl-2-oxocyclohexanecarboxlic acid: lack of stereoelectronic control in .beta.-keto acid decarboxylation
Kinetics of decarboxylation of the two epimers of 5-tert-butyl-1-methyl-2-oxocyclohexanecarboxlic acid: lack of stereoelectronic control in .beta.-keto acid decarboxylation
Substrate scope in the copper-mediated construction of bis-oxindoles via a double C–H/Ar–H coupling process
作者:Pauline Drouhin、Timothy E. Hurst、Adrian C. Whitwood、Richard J.K. Taylor
DOI:10.1016/j.tet.2015.02.060
日期:2015.9
The synthesis of bis-oxindoles via the copper(II)-mediated double cyclisation of linear bis-anilides is described. Cu(OAc)(2)center dot H2O was identified as an efficient and inexpensive catalyst for this process. In contrast to previous methods, which rely on the synthesis of the central core from existing oxindole building blocks, this new approach focusses on concurrent formation of both oxindole rings from a simple linear precursor, allowing the formation of bis-oxindoles containing a diverse range of cyclic and acyclic linkers using a single synthetic method. (C) 2015 Elsevier Ltd. All rights reserved.
Copper-Mediated Construction of Spirocyclic Bis-oxindoles via a Double C–H, Ar–H Coupling Process
作者:Pauline Drouhin、Timothy E. Hurst、Adrian C. Whitwood、Richard J. K. Taylor
DOI:10.1021/ol5024129
日期:2014.9.19
A double C-H, Ar-H coupling process for the conversion of bis-anilides into spirocyclic bis-oxindoles, enabling the concomitant formation of two all-carbon quaternary centers at oxindole 3-positions in a diastereoselective manner, is described. The optimum cyclization conditions utilize stoichiometric Cu(OAc)(2).H2O/KOtBu in DMF at 110 degrees C and have been applied to prepare a range of structurally diverse bis-spirooxindoles in fair to good yields (28-77%); the method has also been extended to prepare bis-oxindoles linked by a functionalized acyclic carbon chain.
KAYSER, R. H.;BRAULT, M.;POLLACK, R. M.;BANTIA, S.;SADOFF, S. F., J. ORG. CHEM., 1983, 48, N 24, 4497-4502
作者:KAYSER, R. H.、BRAULT, M.、POLLACK, R. M.、BANTIA, S.、SADOFF, S. F.
DOI:——
日期:——
Kinetics of decarboxylation of the two epimers of 5-tert-butyl-1-methyl-2-oxocyclohexanecarboxlic acid: lack of stereoelectronic control in .beta.-keto acid decarboxylation
作者:Robert H. Kayser、Margaret Brault、Ralph M. Pollack、Shanta Bantia、Scott F. Sadoff