Regioselective [3+3] Cyclization of 1,3-Bis(silyloxy)buta-1,3-dienes with 1,1,1-Trifluoro-4-(silyloxy)alk-3-en-2-ones: New and Convenient Synthesis of Functionalized 5-Alkyl-3-(trifluoromethyl)phenols
作者:Stefan Büttner、Alina Bunescu、Sebastian Reimann、T. H. Tam Dang、Thomas Pundt、Renske Klassen、Andreas Schmidt、Nazken K. Kelzhanova、Zharylkasyn A. Abilov、Tariel V. Ghochikyan、Ashot S. Saghiyan、Alexander Villinger、Helmut Reinke、Anke Spannenberg、Peter Langer
DOI:10.1002/hlca.201200056
日期:2013.1
Functionalized 5‐alkyl‐3‐(trifluoromethyl)phenols were prepared by formal [3+3] cyclization of 1,3‐bis(silyloxy)buta‐1,3‐dienes with 1,1,1‐trifluoro‐4‐(silyloxy)alk‐3‐en‐2‐ones derived from 1,1,1‐trifluoroalkane‐2,4‐diones. The latter were prepared by condensation of the dianion of 1,1,1‐trifluoropentane‐2,4‐dione with alkyl halides.
Regioselective Synthesis of Functionalized Resorcins by Cyclization of 1,3-Bis(trimethylsilyloxy)-1,3-butadienes with 3,3-Dimethoxypentanoyl Chloride
作者:Peter Langer、Muhammad Sher
DOI:10.1055/s-2008-1072675
日期:——
Functionalized resorcins are regioselectively prepared by cyclization of 1,3-bis(trimethylsilyloxy)-1,3-butadienes with 3,3 -dimethoxypentanoyl chloride. The regioselectivity is controlled by the type of Lewis acid employed.
One-Pot Synthesis of Functionalized 3-(Trifluoromethyl)phenols by [3+3] Cyclization of 1,3-Bis(silyl enol ethers) with α,β-Unsaturated Trifluoromethyl Ketones
作者:Constantin Mamat、Thomas Pundt、T. H. Tam Dang、Renske Klassen、Helmut Reinke、Martin Köckerling、Peter Langer
Regioselective synthesis of benzo[c]chromen-6-ones by one-pot cyclocondensation of 1,3-bis(trimethylsilyloxy)-1,3-butadienes with 4-chloro-2-oxo-2H-chromene-3-carbaldehyde
作者:Olumide Fatunsin、Viktor O. Iaroshenko、Sergii Dudkin、Satenik Mkrtchyan、Alexander Villinger、Peter Langer
DOI:10.1016/j.tetlet.2010.06.138
日期:2010.9
The cyclocondensation of 4-chloro-2-oxo-2H-chromene-3-carbaldehyde with 1,3-bis(silyloxy)-1,3-butadienes provides a convenient synthesis of benzo[c]chromen-6-ones.
4-氯-2-氧代-2- H-亚甲基-3-甲醛与1,3-双(甲硅烷氧基)-1,3-丁二烯的环缩合反应可方便地合成苯并[ c ]铬-6-酮。
First Cyclocondensations of
1,3-Bis(trimethylsilyloxy)buta-1,3-dienes with 1,1-Dimethoxy-4,4,4-trifluorobut-1-en-3-one
The formal [3+3] cyclocondensation of 1,3-bis(trimethylsilyloxy)buta-1,3-dienes with 1,1-bis(methoxy)trifluoromethyl-1-en-3-ones afforded functionalized 3-methoxy-5-(trifluoromethyl)phenols with very good regioselectivity.