Reversal of polarity by catalytic SET oxidation: synthesis of azabicyclo[<i>m</i>.<i>n</i>.0]alkanes <i>via</i> chemoselective reduction of amidines
作者:Kirana Devarahosahalli Veeranna、Kanak Kanti Das、Sundarababu Baskaran
DOI:10.1039/d1ob00416f
日期:——
A one-pot catalytic method has been developed for the stereoselective synthesis of cyclopropane-fused cyclic amidines using CuBr2/K2S2O8 as an efficient single electron transfer (SET) oxidative system. The generality of this mild method is demonstrated with a wide variety of substrates to furnish pharmaceutically important amidines containing aza-bicyclic and novel aza-tricyclic frameworks in very
使用CuBr 2 /K 2 S 2 O 8作为有效的单电子转移(SET)氧化体系,开发了一种用于立体选择性合成环丙烷稠合环脒的单锅催化方法。这种温和方法的普遍性通过多种底物得到证明,以非常好的收率提供含有氮杂-双环和新型氮杂-三环骨架的药学上重要的脒。将环脒化学选择性还原为 2-/3-氮杂双环[ m . n .0]烷烃和八氢吲哚已使用 NaBH 4 /I 2开发试剂系统。化学选择性还原脒官能团的合成范围已在基于亚氨基糖的 (±)-表喹酰胺类似物的立体选择性合成中得到例证。
Pd-Catalyzed Regiodivergent Synthesis of Diverse Oxindoles Enabled by the Versatile Heck Reaction of Carbamoyl Chlorides
oxindole synthesis bearing an all-carbon quaternary center, enabled by Pd-catalyzed intramolecular cyclization followed by multiple intermolecular Heck reactions of both easily accessible alkene-tethered carbamoyl chlorides and olefins. This protocol obviates the use of prefunctionalized olefinic reagents, exhibits excellent functional group tolerance, and features fascinating reactive versatility.
A detailed investigation of the aza-Prins reaction
作者:Adrian P. Dobbs、Sebastien J. J. Guesné、Robert J. Parker、John Skidmore、Richard A. Stephenson、Mike B. Hursthouse
DOI:10.1039/b915797b
日期:——
The development of a Lewis acid-promoted aza-Prins reaction to form piperidines and pyrrolidines is described. Indium trichloride has been found to be a highly successful and mild Lewis acid for promoting this reaction. A thorough mechanistic investigation is described, including the factors that influence the formation of the 5- or 6-membered ring product(s).
The synthesis of azabicycloalkenones bearing a vinylogous amide moiety was achieved by means of the rhodium-catalyzed decarbonylative cycloaddition of cyclobutenediones with a pendant alkene. The starting cyclobutenediones were efficiently prepared from appropriate squaricacid monoesters and N-benzylalkenylamines under microwave heating conditions.
Palladium‐Catalyzed Carbamoyl‐Carbamoylation/ Carboxylation/Thioesterification of Alkene‐Tethered Carbamoyl Chlorides Using Mo(CO)
<sub>6</sub>
as the Carbonyl Source
ation/thioesterification of alkene-tethered carbamoyl chlorides using Mo(CO)6 as the carbonyl source. The reactions were typically performed with good functional group compatibility and tolerated different nucleophiles (amines, alcohols, phenols, thiols and water), which provided a newaccess to amidated/esterificated/thioesterificated/carboxylated oxindoles or lactams bearing an all-carbon quaternary
我们报道了使用 Mo(CO) 6作为羰基源的烯烃系链氨基甲酰氯的钯催化的氨基甲酰-氨基甲酰化/羧化/硫酯化。该反应通常以良好的官能团相容性和耐受不同的亲核试剂(胺、醇、酚、硫醇和水)进行,这为获得酰胺化/酯化/硫酯化/羧化羟吲哚或内酰胺提供了新途径无 CO 气体条件。此外,天然产物突变和不同的后期衍生化是重要的实用特征。