Gold-Catalyzed Intermolecular Ynamide Amination-Initiated Aza-Nazarov Cyclization: Access to Functionalized 2-Aminopyrroles
摘要:
A novel gold-catalyzed intermolecular ynamide amination-initiated aza-Nazarov cyclization has been developed, allowing the facile and efficient synthesis of various 2-aminopyrroles in moderate to good yields. Furthermore, a mechanistic rationale for this tandem sequence, especially for the observed high regioselectivity, is also well supported by DFT (density functional theory) computations. The high flexibility, broad substrate scope, and mild nature of this reaction render it a viable alternative for the construction of 2-aminopyrroles.
Continuous-flow processes for the <i>S</i>-alkynylation of cysteine-containing peptides and thioglycosides under catalyst-free, oxidant-free and mild conditions
Selective S-alkynylation of cysteine-containing peptides and 1-thioglycoside residues was developed using continuous flow.
含半胱氨酸肽和1-硫代糖苷残基的选择性S-炔基化反应已经在连续流条件下开发。
Three‐Component Reaction for the Synthesis of Highly Functionalized Propargyl Ethers
作者:Guillaume Pisella、Alec Gagnebin、Jérôme Waser
DOI:10.1002/chem.202001317
日期:2020.8.12
Multicomponent reactions provide efficient means to access molecular complexity. Herein, we report a copper‐catalyzed three‐component reaction of diazo compounds, alcohols and ethynyl benziodoxole (EBX) reagents for the synthesis of propargyl ethers. Extensive variations of the three partners of the reaction is possible, leading to highly functionalized and structurally diverse products under mild
Exploring Skeletal Diversity via Ring Contraction of Glycal-Derived Scaffolds
作者:Adam R. Yeager、Geanna K. Min、John A. Porco,、Scott E. Schaus
DOI:10.1021/ol0618252
日期:2006.10.1
Arylether C-glycoside scaffolds have been prepared from tri-O-acetyl-D-glucal by C-glycosylation followed by allylic substitution with phenols mediated by Pd(0). The arylethers were subjected to either [3,3]-sigmatropic rearrangement to produce 3-pyranyl-phenols or Au(III)-mediated ring contraction to create highly substituted tetrahydrofurans. [structure: see text]
An efficient ketone-catalyzed asymmetric epoxidation using hydrogen peroxide (H 2 O 2 ) as primary oxidant
作者:Lianhe Shu、Yian Shi
DOI:10.1016/s0040-4020(01)00362-3
日期:2001.6
High enantioselectivities have been obtained for asymmetricepoxidation of olefins using a fructose-derived chiral ketone (5) as catalyst and hydrogenperoxide as primary oxidant.
The Vinyl Moiety as a Handle for Regiocontrol in the Preparation of Unsymmetrical 2,3-Aliphatic-Substituted Indoles and Pyrroles
作者:Malcolm P. Huestis、Lina Chan、David R. Stuart、Keith Fagnou
DOI:10.1002/anie.201006381
日期:2011.2.7
enynes with N‐aryl ureas (X=NR2) and N‐vinylacetamides (X=C(O)Me), affording the corresponding 2‐alkenylindoles and 2‐alkenylpyrroles in good yield. Simple hydrogenation delivers the C2/C3‐aliphatic‐substituted indole or pyrrole (see scheme).
Rho-Rho-Rho您的小船:铑催化剂可实现烯炔与N-芳基脲(X = NR 2)和N-乙烯基乙酰胺(X = C(O)Me)的区域选择性氧化偶联,提供相应的2-烯基吲哚和2-烯基吡咯的收率好。简单的氢化作用即可得到C2 / C3脂肪族取代的吲哚或吡咯(参见方案)。