Chemoselective Electrosynthesis Using Rapid Alternating Polarity
作者:Yu Kawamata、Kyohei Hayashi、Ethan Carlson、Shobin Shaji、Dirk Waldmann、Bryan J. Simmons、Jacob T. Edwards、Christoph W. Zapf、Masato Saito、Phil S. Baran
DOI:10.1021/jacs.1c06572
日期:2021.10.13
in the selective manipulation of functional groups (chemoselectivity) in organic synthesis have historically been overcome either by using reagents/catalysts that tunably interact with a substrate or through modification to shield undesired sites of reactivity (protecting groups). Although electrochemistry offers precise redox control to achieve unique chemoselectivity, this approach often becomes challenging
Cu(OTf)<sub>2</sub> catalyzed Ugi-type reaction of <i>N</i>,<i>O</i>-acetals with isocyanides for the synthesis of pyrrolidinyl and piperidinyl 2-carboxamides
作者:Zhuo-Ya Mao、Xiao-Di Nie、Yi-Man Feng、Chang-Mei Si、Bang-Guo Wei、Guo-Qiang Lin
DOI:10.1039/d1cc03113a
日期:——
The Cu(OTf)2 catalyzed Ugi-type reactions of N,O-acetals with isocyanides have been described for the synthesis of pyrrolidinyl and piperidinyl 2-carboxamides. 4-Hydroxy-5-substituted-prolinamides can be obtained in high diastereoselectivities (2,4-cis/trans > 19 : 1) and a stereoselective model was proposed for 2,4-cis selectivity. Moreover, 4-F-VH 032, a novel analog of the VHL ligand, was conveniently
Enantioselective, Thiourea-Catalyzed Intermolecular Addition of Indoles to Cyclic N-Acyl Iminium Ions
作者:Emily A. Peterson、Eric N. Jacobsen
DOI:10.1002/anie.200902420
日期:——
Fair game for indoles, N‐acyl iminiumion intermediates underwent intermolecularaddition by these nucleophiles under the catalysis of a chiral thiourea Schiff base derivative. A variety of functionalized indole frameworks were assembled with high enantioselectivity from simple precursors by this method (see scheme; TMS=trimethylsilyl; R=H, Me, vinyl, OMe, F, Cl, Br; R1=benzyl, methyl; n=1,2).
An Alkylidene Carbene C–H Activation Approach toward the Enantioselective Syntheses of Spirolactams: Application to the Synthesis of (−)-Adalinine
作者:Krishna Annadi、Andrew G. H. Wee
DOI:10.1021/acs.joc.5b02582
日期:2016.2.5
that the reaction efficiency is sensitive to the reaction temperature and the amount of lithio(trimethylsilyl)diazomethane employed, which led to the development of optimal reaction conditions for effecting alkylidene carbene generation-C–H insertion. Using the optimal reaction conditions, good to high yields (53–76%) of both γ- and δ-lactam spirocycles were obtained. The synthetic utility of the spirolactams
Lewis acid-promoted tandem desulfurization and hydroxylation of γ-phenylthio-substituted lactams: novel synthetic strategy of isoindolobenzazepine alkaloid, chilenine
and hydroxylation reactions to generate γ-hydroxylated lactams without the ring-opened products in extremely high yields, respectively. This process was further applied to the totalsynthesis of an isoindolobenzazepinealkaloid, chilenine, by featuring the elaboration of the functionalized phthalimide derivative.