An Atom-Economical Approach to the Synthesis of Potentially Bioactive 2H-Chromenes via CuI-Catalyzed Reactions of Alkyl/Aryl-(E)-(o-Propargyloxy)styryl Ketones
摘要:
A series of potentially bioactive 2H-chromenes have been synthesized in good yields (60-82%) via CuI-catalyzed reactions of alkyl/aryl-(E)-(o-propargyloxy)styryl ketones in an atom-economical approach.
Double intramolecular Diels–Alder reaction of α,β-unsaturated hydrazones: a new route to 2,2′-bipyridines
作者:Nicholas Bushby、Christopher J. Moody、Christopher J. Moody、David A. Riddick、Ian R. Waldron
DOI:10.1039/a901641d
日期:——
Heating the 1,3-diynyl bis-α,β-unsaturated hydrazones 3, 6 and 10 results in double intramolecular DielsâAlder reaction of the 1-azadienes, and after aromatisation by loss of dimethylamine, the formation of bipyridines 11â14.
Intramolecular Diels–Alder reactions of α,β-unsaturated oxime ethers as 1-azadienes: synthesis of [c]-fused pyridines
作者:Timothy E. Hurst、Timothy J. Miles、Christopher J. Moody
DOI:10.1016/j.tet.2007.09.090
日期:2008.1
The intramolecular hetero-Diels–Alder reaction of α,β-unsaturated oxime ethers as the diene with acetylenic dienophiles, readily prepared from salicylaldehyde derivatives, is described as a rapid and versatile route to [c]-annelated pyridines in modest to good yields.
α,β-不饱和肟醚(如二烯)与乙炔二烯亲生体的分子内杂狄尔斯-阿尔德反应(由水杨醛衍生物容易制得)被描述为以适度到良好收率制备[ c ]-退火吡啶的快速通用途径。
Nickel Catalyzed <i>syn</i>-Selective Aryl Nickelation and Cyclization of Aldehyde/Enone-Tethered Terminal Alkynes with Arylboronic Acids
A syn-arylative nickelation followed by nucleophilic syn-selective cyclization of o-propargyloxy benzaldehydes is achieved toward the synthesis of chromanol skeletons with alkenyl substitution at C3. The capture of the intermediate vinyl nickel in its cis geometry is done also with a Michael acceptor to synthesize 4-alkylated derivatives. This protocol is equally applicable to o-propargylamino benzaldehydes to access 3,4-disubstituted tetrahydro-hydroquinolines.
Double intramolecular hetero Diels–Alder reactions of α,β-unsaturated hydrazones as 1-azadienes: a new route to 2,2′-bipyridines
作者:Nicholas Bushby、Christopher J. Moody、David A. Riddick、Ian R. Waldron
DOI:10.1039/b105409k
日期:——
Salicylaldehyde was converted into the O-propynyl- and O-butynyl α,β-unsaturated aldehydes 4 and ketones 6, subsequent reaction of which with N,N-dimethylhydrazine and alkyne homocoupling gave the 1,3-diyne bis(hydrazones) 8, substrates for a double intramolecular hetero Diels–Alderreaction. Similar substrates 11, 15a/15c and 15b/15d were prepared from 2-(N-benzoylamino)cinnamaldehyde, hex-5-ynol and hept-6-ynol
An Atom-Economical Approach to the Synthesis of Potentially Bioactive 2H-Chromenes via CuI-Catalyzed Reactions of Alkyl/Aryl-(E)-(o-Propargyloxy)styryl Ketones
作者:K. Majumdar、Inul Ansary、Pranab Shyam、B. Roy
DOI:10.1055/s-0031-1290769
日期:2012.5
A series of potentially bioactive 2H-chromenes have been synthesized in good yields (60-82%) via CuI-catalyzed reactions of alkyl/aryl-(E)-(o-propargyloxy)styryl ketones in an atom-economical approach.