Silicon Carbide Passive Heating Elements in Microwave-Assisted Organic Synthesis
作者:Jennifer M. Kremsner、C. Oliver Kappe
DOI:10.1021/jo060692v
日期:2006.6.1
Microwave-assisted organic synthesis in nonpolar solvents is investigated utilizing cylinders of sintered silicon carbide (SiC)a chemically inert and strongly microwave absorbing materialas passive heating elements (PHEs). These heating inserts absorb microwave energy and subsequently transfer the generated thermal energy via conduction phenomena to the reaction mixture. The use of passive heating
Cu(acac)2 Immobilized in Ionic Liquids: A Recoverable and Reusable Catalytic System for Aza-Michael Reactions
作者:M. Lakshmi Kantam、V. Neeraja、B. Kavita、B. Neelima、Mihir K. Chaudhuri、Sahid Hussain
DOI:10.1002/adsc.200404361
日期:2005.5
Copper(II) acetylacetonate immobilized in ionicliquids efficiently catalyzes the aza-Michaelreaction of amines with α,β-unsaturated carbonyl compounds to produce the corresponding β-amino carbonyl compounds with great alacrity in excellent yields. The reactions are far more facile than those reported earlier. The recoveredionicliquid phase containing the copper catalyst can be reused for several cycles
Cellulose-Supported Copper(0) Catalyst for Aza-Michael Addition
作者:K. Reddy、Nadakudity Kumar
DOI:10.1055/s-2006-949623
日期:2006.9
Cellulose-supported copper(0) efficiently catalyzes the aza-Michael reaction of N-nucleophiles, such as amines and imidazoles with α,β-unsaturated compounds to produce the corresponding β-amino compounds and N-substituted imidazoles in excellent yields. The reactions are facile and the recovered catalyst is used for several cycles with consistent activity.
Chemoselective Michael TypeAddition of Aliphatic Amines to α,β-Ethylenic CompoundsUsing Bismuth Triflate Catalyst
作者:Srinivas R. Adapa、Ravi Varala、M. Mujahid Alam
DOI:10.1055/s-2003-38345
日期:——
Catalytic amounts of bismuth triflate efficiently catalyse the conjugate addition of aliphatic amines to α,β-ethylenic compounds in acetonitrile under mild conditions. The reaction is chemoselective, as aromatic amines do not participate in the reaction. Further, the catalyst can be easily recovered and reused.
Electrochemical fluorination of several 1,4-bis[(methoxycarbonyl)alkyl] substituted piperazines
作者:Takashi Abe、Hajime Baba、Irina Soloshonok
DOI:10.1016/s0022-1139(01)00357-8
日期:2001.5
Four piperazines, having bis[(methoxycarbonyl)alkyl] groups (CH2CH2C(O)OMe (1), CH(CH3)C(O)OMe (2), CH2CH(CH3)C(O)OMe (3) and CH(CH3)CH2C(O)OMe (4) at the 1- and 4-positions of the piperazine ring), were subjected to electrochemical fluorination (ECF). Two bis[(methoxycarbonyl)alkyl] derivatives of N,N′-dimethylethylenediamine (molecular formulae: MeO(O)CH2CH2N(CH3)CH2CH2N(CH3)CH2CH2C(O)OMe (5)