Synthesis of Ketones and Esters from Heteroatom-Functionalized Alkenes by Cobalt-Mediated Hydrogen Atom Transfer
作者:Xiaoshen Ma、Seth B. Herzon
DOI:10.1021/acs.joc.6b01709
日期:2016.10.7
Cobalt bis(acetylacetonate) is shown to mediate hydrogen atom transfer to a broad range of functionalized alkenes; in situ oxidation of the resulting alkylradical intermediates, followed by hydrolysis, provides expedient access to ketones and esters. By modification of the alcohol solvent, different alkyl ester products may be obtained. The method is compatible with a number of functional groups including
A Concise Enantioselective Synthesis of (−)-Ranirestat
作者:Barry M. Trost、Maksim Osipov、Guangbin Dong
DOI:10.1021/ol100167w
日期:2010.3.19
A concise, enantioselective synthesis of the potent aldose reductaseinhibitor ranirestat (1) is reported. The synthesis was accomplished employing inexpensive, commercially available starting materials. A palladium-catalyzed asymmetric allylic alkylation (Pd-AAA) of malonate 4 was utilized as a key transformation to construct the tetrasubstituted chiral center in the target.
Fe/Cr- and Co/Cr-Mediated Catalytic Asymmetric 2-Haloallylations of Aldehydes
作者:Michio Kurosu、Mei-Huey Lin、Yoshito Kishi
DOI:10.1021/ja045557j
日期:2004.10.1
is reported. The coupling reaction is effected by the use of a chiral sulfonamide-Cr complex (prepared in situ from 1d, CrBr3, Fe(III) or from Co(II), Et3N, and Mn), TMSCl, and 2,6-lutidine. The method reported here is operationally simple and scalable, furnishing 3-halohomoallylic alcohols with a synthetically useful level of enantiomericexcess.
Synthesis of iso-epoxy-amphidinolide N and des-epoxy-caribenolide I structures. Initial forays
作者:K. C. Nicolaou、William E. Brenzovich、Paul G. Bulger、Tasha M. Francis
DOI:10.1039/b602020h
日期:——
Two strategies for the projected total synthesis of the phenomenally potent antitumour macrolides amphidinolide N (1) and caribenolide I (2) are described. The title compounds are introduced as challenging and unique targets for chemical synthesis, and their retrosynthetic analysis is presented. The synthesis of the four defined key building blocks (10, 39, 67 and 72), required for the construction
Chlorotrimethylsilane/sodium iodide in the presence of water has been found as facile method for the hydroiodination of olefins to alkyl iodides under mild conditions. This procedure has successfully been extended to the preparation of deuterated alkyl iodides by using deuterium oxide in place of water.