Palladium-Catalyzed Intramolecular Selenocarbamoylation of Alkynes with Carbamoselenoates: Formation of α-Alkylidene-β-lactam Framework
摘要:
Pd-catalyzed intramolecular selenocarbamoylation of alkynes leading to alpha-alkylidene-beta-lactams was developed. This reaction can be applied to thiocarbamoylation and to the synthesis of delta- and epsilon-lactams and a cyclobutanone.
Lanthanide‐catalyzed alkynyl exchange through C−C single‐bondcleavage assisted by a secondary amino group is reported. A lanthanide amido complex is proposed as a key intermediate, which undergoes unprecedented reversible β‐alkynyl elimination followed by alkynyl exchange and imine reinsertion. The in situ homo‐ and cross‐dimerization of the liberated alkyne can serve as an additional driving force
complex. In particular, by employing an amphiphilic dendritic NHC–gold(I) complex having penta(ethylene glycol) units at the peripheral layer as a catalyst, the aqueous media carboxylative cyclization of propargylicamines proceeded smoothly to provide the corresponding 2-oxazolidinone at room temperature under atmospheric pressure of CO2.
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
An alkaline-resistant Ag(<scp>i</scp>)-anchored pyrazolate-based metal–organic framework for chemical fixation of CO<sub>2</sub>
作者:Huimin Yang、Xu Zhang、Guiyang Zhang、Honghan Fei
DOI:10.1039/c8cc01461b
日期:——
An alkaline-resistant Ag(i)-anchored metal–organic framework has been achieved via postsynthetic modification of pyrazolate-based linkers.
一种耐碱性的Ag(i)锚定金属有机框架已经通过对基于吡唑酮的连接剂进行后合成修饰而实现。
Synthesis of Oxazolidinones by Efficient Fixation of Atmospheric CO<sub>2</sub>with Propargylic Amines by using a Silver/1,8-Diazabicyclo[5.4.0]undec-7-ene (DBU) Dual-Catalyst System
This'll fix it: Efficientfixation of atmospheric CO2 has been achieved by the reaction of propargylicamines with a silver/DBU dual‐catalyst system (see scheme). Various oxazolidinones were synthesized in moderate to good yields by using substituted propargylicamines.