Synthesis of benzo-fused lactams and lactones via Ru(ii)-catalyzed cycloaddition of amide- and ester-tethered α,ω-diynes with terminal alkynes: electronic directing effect of internal conjugated carbonyl group
Synthesis of Polysubstituted Pyrroles from Activated Alkynes and<i>N</i>-Propargylamines through Base-Catalyzed Cascade Reaction
作者:Jianquan Weng、Yong Chen、Binjie Yue、Meng Xu、Hongwei Jin
DOI:10.1002/ejoc.201500166
日期:2015.5
A novel K3PO4-catalyzed synthesis of polysubstitutedpyrroles by a Michael addition/alkyne carbocyclization of activatedalkynes and N-propargylamines has been developed. This transition-metal-free cascade process represents an environmental friendly and efficient way to construct polysubstitutedpyrroles in good yields. Catalyzed by CsF, a Michael addition/aza-Claisen rearrangement/cyclization sequential
A rapid and versatile one-pot, 2 × 10 min microwave protocol for the preparation of N-1 and C-6 decorated 3,5-dichloro-2(1H)-pyrazinones was developed. Comparable reaction sequences using classical conditions require about 1–2 days of heating. The α-aminonitrile was first generated in a Strecker reaction and thereafter cyclized under microwave heating. The microwave approach developed offers the possibility of efficiently generating and utilizing functionalized 3-amino-5-chloro-2(1H)-pyrazinone-N-1-carboxylic acids as β-strand inducing core structures in a medicinal chemistry context. To illustrate the usefulness of the method, the synthesis of two novel 2(1H)-pyrazinone-containing Hepatitis C virus NS3 protease inhibitors is reported.
Unusual Missing Linkers in an Organosulfonate-Based Primitive–Cubic (pcu)-Type Metal–Organic Framework for CO<sub>2</sub> Capture and Conversion under Ambient Conditions
作者:Guiyang Zhang、Huimin Yang、Honghan Fei
DOI:10.1021/acscatal.7b04189
日期:2018.3.2
organosulfonate-based metal–organicframework (MOF) with a defective primitive–cubic (pcu) topology was successfully synthesized. The unusual missing linkers, along with the highest permanent porosity (∼43%) in sulfonate-MOFs, offer a versatile platform for the incorporation of alkynophilic Ag(I) sites. The cyclic carboxylation of alkyne molecules (e.g., propargyl alcohol and propargyl amine) into α-alkylidene
One-pot synthesis of polysubstituted 3-acylpyrroles by cooperative catalysis
作者:Hai-Lei Cui、Fujie Tanaka
DOI:10.1039/c4ob01019a
日期:——
polysubstituted 3-acylpyrroles from readily available unsaturated ketones and N-substituted propargylated amines have been developed. An aza-Michael/alkyne carbocyclization cascade, by cooperative catalysis using pyrrolidine and a copper salt, followed by oxidation in situ gave 3-acylpyrroles, which were also transformed further to functionalized, highly substituted 3-acylpyrroles.