An isomerization-ring-closing metathesis strategy for the synthesis of substituted benzofurans
摘要:
Twelve substituted benzofurans were synthesized from their corresponding substituted l-allyl-2-allyloxybenzenes using ruthenium-mediated G and O-allyl isomerization followed by ring-closing metathesis. (c) 2005 Elsevier Ltd. All rights reserved.
Synthesis of coumarins by ring-closing metathesis using Grubbs’ catalyst
作者:Tuyen Nguyen Van、Silvia Debenedetti、Norbert De Kimpe
DOI:10.1016/s0040-4039(03)00902-x
日期:2003.5
A novel generally applicable synthesis of coumarins from phenolic substrates utilizing ring-closingmetathesis is described. This sequence involves O-allylation of phenols followed by ortho-Claisen rearrangement, subsequent based-induced isomerization affording 2-(1-propenyl)phenols, acylation with acryloyl chloride, and finally ring-closingmetathesis (RCM) with Grubbs’ second generation catalyst
Ring-closing metathesis for the synthesis of benzo-fused bicyclic compounds
作者:Willem A.L. van Otterlo、E.Lindani Ngidi、E.Mabel Coyanis、Charles B. de Koning
DOI:10.1016/s0040-4039(02)02522-4
日期:2003.1
Ring-closing metathesis (RCM) was used to synthesise five 4H-chromenes, a naphthol and an indenol. These are the first examples of RCM applied to the synthesis of such benzo-fusedbicyclic compounds.
Ring-closing metathesis for the synthesis of 2H- and 4H-chromenes
作者:Willem A.L. van Otterlo、E. Lindani Ngidi、Samuel Kuzvidza、Garreth L. Morgans、Simon S. Moleele、Charles B. de Koning
DOI:10.1016/j.tet.2005.08.020
日期:2005.10
Six 4H-chromenes were synthesized from substituted phenols using vinylstannylation and ring-closing metathesis (RCM) as key steps. In addition, a different approach involving amongst other steps, an aryl allyl isomerization and RCM afforded a set of seven 2H-chromenes from phenolic precursors. (c) 2005 Elsevier Ltd. All rights reserved.
An isomerization-ring-closing metathesis strategy for the synthesis of substituted benzofurans
作者:Willem A.L. van Otterlo、Garreth L. Morgans、Lee G. Madeley、Samuel Kuzvidza、Simon S. Moleele、Natalie Thornton、Charles B. de Koning
DOI:10.1016/j.tet.2005.05.090
日期:2005.8
Twelve substituted benzofurans were synthesized from their corresponding substituted l-allyl-2-allyloxybenzenes using ruthenium-mediated G and O-allyl isomerization followed by ring-closing metathesis. (c) 2005 Elsevier Ltd. All rights reserved.
Synthetic Models Related to Methoxalen – CYP2A6 Interactions. Dimethoxybenzofuran Derivatives as Potent and Selective Inhibitors of CYP2A6
The human CYP2A6 enzyme metabolizes several xenobiotics including nicotine, the addictive component in tobacco. Reduced activity of CYP2A6, either for genetic reasons or by administering inhibitors of CYP2A6, reduces tobacco smoking. The reported compound methoxalen had a potent inhibitory effect on activity of CYP2A6 with an IC50 value of 1.27 mu M. We selected methoxalen as a lead compound and prepared various dimethoxybenzofuran derivatives that have inhibitory effects on activity of human cytochrome P450 (CYP) 2A6. Synthetic benzofuran derivatives (3,6-dimethoxybenzofuran: IC50=1.92 mu M and 3,7-dimethoxybenzofuran: IC50=2.00 mu M) also exhibited comparable activities against CYP2A6 and were selective inhibitors of CYP2A6. These compounds can be used as lead compounds in the development of drugs for smoking reduction therapy.