Room Temperature Coupling of Aryldiazoacetates with Boronic Acids Enhanced by Blue Light Irradiation
作者:Amanda F. Silva、Marco A. S. Afonso、Rodrigo A. Cormanich、Igor D. Jurberg
DOI:10.1002/chem.201905812
日期:2020.5.4
visible-light-promoted photochemical protocol is reported for the coupling of aryldiazoacetates with boronic acids. This photochemicalreaction shows great enhancement compared to the same protocol performed in the absence of light. Except for a few cases, the room temperature coupling in the dark (thermal process) generally does not work. When it does, it is likely to also involve free carbenes as key intermediates
Guide to enantioselective dirhodium(II)-catalyzed cyclopropanation with aryldiazoacetates
作者:Kathryn M. Chepiga、Changming Qin、Joshua S. Alford、Spandan Chennamadhavuni、Timothy M. Gregg、Jeremy P. Olson、Huw M.L. Davies
DOI:10.1016/j.tet.2013.04.075
日期:2013.7
Catalytic enantioselective methods for the generation of cyclopropanes have been of long standing pharmaceutical interest. Chiraldirhodium(II) catalysts prove to be an effective means for the generation of diverse cyclopropane libraries. Rh2(R-DOSP)4 is generally the most effective catalyst for asymmetric intermolecular cyclopropanation of methyl aryldiazoacetates with styrene. Rh2(S-PTAD)4 provides
用于生成环丙烷的催化对映选择性方法长期以来一直是制药业的兴趣所在。手性二铑 (II) 催化剂被证明是生成各种环丙烷库的有效手段。Rh 2 ( R -DOSP) 4通常是重氮乙酸甲酯与苯乙烯的不对称分子间环丙烷化反应最有效的催化剂。Rh 2 ( S -PTAD) 4提供高水平的邻位取代芳基重氮乙酸酯的对映体诱导。不太成熟的 Rh 2 ( R -BNP) 4对 Rh 2 ( R-DOSP) 4和 Rh 2 ( S -PTAD) 4在催化 3-甲氧基取代的重氮基乙酸芳基酯的高度对映选择性环丙烷化反应中。苯乙烯的取代对环丙烷化的不对称诱导仅具有中等影响。
Visible-Light-Mediated Strategies for the Preparation of Oxime Ethers Derived from O–H Insertions of Oximes into Aryldiazoacetates
作者:Mateus L. Stivanin、Marcelo Duarte、Luiz Paulo M. O. Leão、Felipe A. Saito、Igor D. Jurberg
DOI:10.1021/acs.joc.1c02411
日期:2021.12.3
insertion protocols involving oximes and aryldiazoacetates leading to different products depending on the solvent employed are reported. In DCM, direct O–H insertion takes place. In THF, there is the additional incorporation of the ring-opened form of this solvent into the structure of the product. These metal-free protocols are mild and tolerant to air and moisture. The preparation of an acaricide has been
Visible-Light-Mediated Strategies to Assemble Alkyl 2-Carboxylate-2,3,3-Trisubstituted β-Lactams and 5-Alkoxy-2,2,4-Trisubstituted Furan-3(2H)-ones Using Aryldiazoacetates and Aryldiazoketones
作者:Laiéli S. Munaretto、Caio Y. dos Santos、Rafael D. C. Gallo、Celso Y. Okada、Victor M. Deflon、Igor D. Jurberg
DOI:10.1021/acs.orglett.1c03662
日期:2021.12.3
describes the reaction with sulfoxides to afford the corresponding sulfoxonium ylides, followed by reaction with aryldiazoketones to produce 5-alkoxy-2,2,4-trisubstituted furan-3(2H)-ones. These protocols take advantage of the photolysis of aryldiazoacetates and the photochemically promoted Wolff rearrangement of aryldiazoketones.
Gold-catalyzed construction of two adjacent quaternary stereocenters via sequential C–H functionalization and aldol annulation
作者:Zhunzhun Yu、Haile Qiu、Lu Liu、Junliang Zhang
DOI:10.1039/c5cc08880a
日期:——
A novel gold-catalyzed intermolecular C–H functionalization and aldol cyclization for the construction of two adjacent quaternary centers is presented.