Metal-Catalyzed Cycloisomerization of Enyne Functionalities via a 1,3-Alkylidene Migration
摘要:
We report a new metal-catalyzed 6-endo-dig cyclization of cis-4,6-dien-1-yn-3-ols, which produces substituted benzene and naphthalene derivatives with structural reorganization. In this process, we observe a 1,3-alkylidene migration via cleavage of the olefin double bond of the starting substrates. The ease and reliability of this cyclization are manifested by its compatibility with a wide array of diverse substrates and several pi-alkyne activators, including PtCl2, Zn(OTf)2, AuCl, and AuCl3.
Metal-Catalyzed Cycloisomerization of Enyne Functionalities via a 1,3-Alkylidene Migration
摘要:
We report a new metal-catalyzed 6-endo-dig cyclization of cis-4,6-dien-1-yn-3-ols, which produces substituted benzene and naphthalene derivatives with structural reorganization. In this process, we observe a 1,3-alkylidene migration via cleavage of the olefin double bond of the starting substrates. The ease and reliability of this cyclization are manifested by its compatibility with a wide array of diverse substrates and several pi-alkyne activators, including PtCl2, Zn(OTf)2, AuCl, and AuCl3.
Rhodium-Catalyzed, Enantioselective Hydroacylation of <i>ortho</i>-Allylbenzaldehydes
作者:Kirsten F. Johnson、Adam C. Schmidt、Levi M. Stanley
DOI:10.1021/acs.orglett.5b02559
日期:2015.10.2
The development of a rhodiumcatalyst for endo- and enantioselective hydroacylation of ortho-allylbenzaldehydes is reported. A catalyst generated in situ from [Rh(COD)Cl]2, (R)-DTBM-SEGPHOS, and NaBARF promotes the desired hydroacylation reactions and minimizes the formation of byproducts from competitive alkene isomerization and ene/dehydration pathways. These rhodium-catalyzed processes generate
Cyclization of (2-Alkenylphenyl)carbonyl Compounds to Polycyclic Arenes Catalyzed by Copper(II) Trifluoromethanesulfonate or Trifluoromethanesulfuric Acid
作者:Wei-Min Liu、Ya Lin Tnay、Kian Ping Gan、Zhen-Hong Liu、Wan Huei Tyan、Koichi Narasaka
DOI:10.1002/hlca.201200396
日期:2012.10
Various polycyclicarenes, such as naphthalenes, tetrahydroantharacenes, tetrahydrotetracenes, dihydropentacenes, and dihydropentaphenes are prepared from 2‐alkenylphenyl ketones and aldehydes by the catalytic use of copper(II) trifluoromethanesulfonate (Cu(OTf)2) or trifluoromethanesulfuricacid (TfOH).
Munro, David P.; Sharp, John T., Journal of the Chemical Society. Perkin transactions I, 1984, # 4, p. 849 - 858
作者:Munro, David P.、Sharp, John T.
DOI:——
日期:——
<i>In Situ</i> Formed Acetal-Facilitated Synthesis of Substituted Indene Derivatives from <i>o</i>-Alkenylbenzaldehydes
作者:Seetharaman Manojveer、Rengarajan Balamurugan
DOI:10.1021/acs.orglett.5b01695
日期:2015.7.17
A new protocol has been developed for the synthesis of indene derivatives, in a diastereoselective manner from,o-alkenylbenzaldehydes and enolizable ketones hi the presence of trimethyl orthoformate and catalytic triflic acid. This method involves tandem in situ formed acetal-assisted Claisen-Schmidt condensation followed by 5-exo-trig cyclization/Michael addition in one-pot. It has also been shown that the chalcones derived from o-alkenylbenzaldehydes and ketones can effectively be transformed into indene derivatives in the presence of TfOH catalyst alone.
Motion, Keith R.; Robertson, Ian R.; Sharp, John T., Journal of the Chemical Society. Perkin transactions I, 1992, # 13, p. 1709 - 1720
作者:Motion, Keith R.、Robertson, Ian R.、Sharp, John T.、Walkinshaw, Malcolm D.