Rhodium(II)-Catalyzed Cross-Coupling of Diazo Compounds
作者:Jørn H. Hansen、Brendan T. Parr、Philip Pelphrey、Quihui Jin、Jochen Autschbach、Huw M. L. Davies
DOI:10.1002/anie.201004923
日期:2011.3.7
left to chance: A convenient protocol for selective cross‐coupling of diazocompounds for the convergent synthesis of alkenes was developed (see scheme; EDG=aryl, heteroaryl, vinyl; R=O‐alkyl, aryl). The selectivity control elements were identified by ReactIR and DFT calculations and provide a framework for the design of viable diazo coupling reactions.
没事了:开发了用于重氮合成烯烃的重氮化合物选择性交叉偶联的便捷方案(见方案; EDG =芳基,杂芳基,乙烯基; R = O-烷基,芳基)。通过ReactIR和DFT计算确定了选择性控制元素,并为可行的重氮偶合反应设计提供了框架。
Synthesis of [18F]-γ-Fluoro-α,β-unsaturated Esters and Ketones via Vinylogous 18F-Fluorination of α-Diazoacetates with [18F]AgF
作者:Stephen Thompson、So Jeong Lee、Isaac M. Jackson、Naoko Ichiishi、Allen F. Brooks、Melanie S. Sanford、Peter J. H. Scott
DOI:10.1055/s-0039-1690012
日期:2019.12
a fluorinated cholest-5-en-3-one derivative as well as a difluorinated product pertinent to drug discovery. This communication reports a method for the vinylogous radiofluorination of α-diazoacetates to generate [18F]-γ-fluoro-α,β-unsaturated esters and ketones in moderate to good radiochemical yields. The method uses no-carrier-added [18F]AgF and is compatible with aromatic and non-aromatic substrates
Synthesis of Allylboranes via Cu(I)-Catalyzed B–H Insertion of Vinyldiazoacetates into Phosphine–Borane Adducts
作者:Denis Drikermann、Robert S. Mößel、Walid K. Al-Jammal、Ivan Vilotijevic
DOI:10.1021/acs.orglett.9b04619
日期:2020.2.7
Cu(I) catalysts enable C-B bond formation via direct insertion of vinyldiazoacetates into B-H bonds of borane-phosphine Lewis adducts to form phosphine-protected allylboranes under mild conditions. The resulting allylborane-phosphine Lewis adducts can be used in the diastereoselective allylation of aldehydes directly without the need for removal of the phosphine. The allylation reaction proceeds with
An Enzymatic Platform for the Highly Enantioselective and Stereodivergent Construction of Cyclopropyl‐δ‐lactones
作者:Xinkun Ren、Ningyu Liu、Ajay L. Chandgude、Rudi Fasan
DOI:10.1002/anie.202007953
日期:2020.11.23
carbene transfer mechanism for the asymmetric synthesis of cyclopropane‐fused‐δ‐lactones, which are key structural motifs found in many biologically active natural products. While hemin, wild‐type myoglobin, and other hemoproteins are unable to catalyze this reaction, the myoglobin scaffold could be remodeled by protein engineering to permit the intramolecular cyclopropanation of a broad spectrum of homoallylic
Stereoselective Ring-Opening of <i>gem</i>
-Difluorocyclopropanes: An Entry to Stereo-defined (<i>E</i>
,<i>E</i>
)- and (<i>E</i>
,<i>Z</i>
)-Conjugated Fluorodienes
The ring‐opening of gem‐difluorocyclopropyl acetaldehydes producing selectively (E,E)‐ and (E,Z)‐conjugated fluorodienals is described. Two stereo‐divergent methods are presented to access both stereoisomers from a common precursor, in high yield and selectivity. The mechanistic aspect of these transformations is discussed.