Organoiodine-Catalyzed Enantioselective Intermolecular Oxyamination of Alkenes
作者:Chisato Wata、Takuya Hashimoto
DOI:10.1021/jacs.0c11440
日期:2021.2.3
Metal-free, catalytic enantioselective intermolecular oxyamination of alkenes is realized by use of organoiodine(I/III) chemistry. The protocol is applicable toward aryl- and alkyl-substituted alkenes with high enantioselectivity and electronically controlled regioselectivity. The oxyaminated products can be easily deprotected in one step to reveal free amino alcohols in high yields without loss of
Use of Olefin Templates in Queued Chemical Transformations Using Late Transition Metal Catalysis. Total Synthesis of <i>cis</i> and <i>trans </i>Bupleurynol via a Single Multireaction Sequence
作者:Haleh Ghasemi、Luis M. Antunes、Michael G. Organ
DOI:10.1021/ol0489853
日期:2004.8.1
1-Bromo-2-iodoethylene (9) was used as a central, pseudosymmetric building block for the fully convergent and modular synthesis of two related natural products, cis (1a) and trans (1b) bupleurynol. In doing so, a 9-step synthesis of 1a (reported previously) has been vastly truncated to one single operation by using queued cross-coupling reactions with Pd catalysis, negating the need for any protecting
Intramolecular Diels–Alder Reactions of Tethered Enoate Substituted Furans Induced by Dialkylaluminum Chloride
作者:Sibylle Riedel、Cäcilia Maichle-Mössmer、Martin E. Maier
DOI:10.1021/acs.joc.7b02117
日期:2017.12.1
enoate-substituted furans 14 and 19. While attempts at thermal and several Lewis acid induced intramolecular Diels–Alder reactions remained fruitless, dialkylaluminum chloride led to the formation of hexahydroindene and octahydronaphthalene derivatives 20–23. Their formation can be explained by Lewis acid induced opening of the epoxy bridge with transfer of one alkyl group to the intermediate cycloadduct
作者:Alexandre Larivée、John B. Unger、Mikaël Thomas、Conny Wirtz、Christophe Dubost、Shinya Handa、Alois Fürstner
DOI:10.1002/anie.201005850
日期:2011.1.3
Out of options? Even though a systematic approach was chosen, which led to a set of four diastereomeric macrolides modeled around the proposed structure of leiodolideB (see picture), the puzzle concerning the stereostructure of this cytotoxic metabolite derived from a deep‐sea sponge still remains unsolved.
The palladium-catalyzed allylic substitution (Tsuji-Trost) reaction is widely applied in organicsynthesis, especially for the synthesis of stereochemically well-defined olefins. However, the synthesis of Z-olefins via the Tsuji-Trost reaction has been challenging due to the thermodynamic instability of the corresponding anti-π-allyl-palladium intermediate. Here, we report a ligand-enabled palladium-catalyzed