Homodimeric coupling–cyclization reaction of 2,3-allenamides
摘要:
The PdCl2/Nal/K2CO3-catalyzed highly stereoselective homodimeric coupling-cyclization reaction of 2,3-allenamides afforded Z-bis(furanimine) derivatives. The addition of K2CO3 is crucial for this reaction and a possible mechanism is proposed. (C) 2009 Elsevier Ltd. All rights reserved.
Access to 1,3-oxazine-2,4-diones/1,3-thiazine-2,4-diones <i>via</i> organocatalytic CO<sub>2</sub>/COS incorporation into allenamides
作者:Hui Zhou、Rui Wang、Hui Zhang、Wei Chen、Xiao-Bing Lu
DOI:10.1039/c9ob02398d
日期:——
Lewis base-CO2/COS adducts were firstly studied as organocatalysts for [4 + 2] annulation of CO2/COS with allenamides to selectively synthesize 1,3-oxazine-2,4-diones/1,3-thiazine-2,4-diones.
Amide-Controlled Highly Selective Catalytic Borylcupration of Allenes
作者:Weiming Yuan、Xue Zhang、Yihua Yu、Shengming Ma
DOI:10.1002/chem.201202835
日期:2013.5.27
A novel copper‐catalyzed, highly regio‐ and stereoselective borylcupration of substituted 2,3‐allenamides with bis(pinacolato)diboron producing Z‐β‐borylated β,γ‐unsaturated enoamides has been demonstrated. Due to the unique effect of the amide‐group, perfect regio‐ and stereoselectivity and good to excellent yields have been achieved, which were rationalized by a DFT study.
A facile synthesis of β-allenyl furanimines via Pd-catalyzed cyclization of 2,3-allenamides with propargylic carbonates
作者:Guofei Chen、Ya Zhang、Chunling Fu、Shengming Ma
DOI:10.1016/j.tet.2011.01.041
日期:2011.3
The Pd(OAc)(2)/TFP-catalyzed cyclization reaction of 2,3-allenamides in the presence of propargylic carbonates provides an efficient route to beta-allenyl furanimine derivatives. Preliminary mechanistic study showed that this reaction was probably initiated by Pd(0) species. (C) 2011 Elsevier Ltd. All rights reserved.
Steric Hindrance-Controlled Pd(0)-Catalyzed Coupling−Cyclization of 2,3-Allenamides and Organic Iodides. An Efficient Synthesis of Iminolactones and γ-Hydroxy-γ-lactams
作者:Shengming Ma、Hexin Xie
DOI:10.1021/jo025967v
日期:2002.9.1
Under the catalysis of 1 mol % Pd(PPh3)(4), the reaction of 4,4-disubstituted 2,3-allenamides and organic iodides in toluene afforded iminolactones stereospecifically in >90% yields using K2CO3 (2 equiv)-5 mol % TBAB as the base. A similar reaction with 4-monosubstituted 2,3-allenamides afforded gamma-hydroxy-gamma-lactams in relatively lower yields. The N/O-attack selectivity may be determined by the steric effect at the 4-position of 2,3-allenamides.