Application of Mitsunobu Reagents to Redox Isomerization of CF3-Containing Propargylic Alcohols to (E)-α,β-Enones
摘要:
Isomerization of CF3-containing secondary propargylic alcohols proceeds with excellent E selectivity by treatment with Mitsunobu reagents, tris(p-methoxyphenyl)phosphine (TMPP), and 1,1'-(azodicarbonyl)dipiperidine (ADDP) in the presence of phenol.
Unexpected high regiocontrol in Heck reaction of fluorine-containing electron-deficient olefins—Highly regio- and stereoselective synthesis of β-fluoroalkyl-α-aryl-α,β-unsaturated ketones
Treatment of (E)-4,4,4-trifluoro-1-aryl-2-buten-1-one with various aryldiazonium salts in the presence of palladium catalyst gave the corresponding α-arylated Heck adducts with high regio- and stereoselectivity in good to high yields.
Application of Mitsunobu Reagents to Redox Isomerization of CF<sub>3</sub>-Containing Propargylic Alcohols to (<i>E</i>)-α,β-Enones
作者:Yohsuke Watanabe、Takashi Yamazaki
DOI:10.1021/jo102503s
日期:2011.3.18
Isomerization of CF3-containing secondary propargylic alcohols proceeds with excellent E selectivity by treatment with Mitsunobu reagents, tris(p-methoxyphenyl)phosphine (TMPP), and 1,1'-(azodicarbonyl)dipiperidine (ADDP) in the presence of phenol.
Electronically Promoted Payne Rearrangement of 3-CF<sub>3</sub>-2,3-Epoxyalcohols
[reaction: see text] Smooth and selective Payne rearrangement was achieved for the above types of epoxyalcohols with a CF(3) group so as to form thermodynamically more stable alkoxides, where the strongly electron-withdrawing nature of this moiety played a significantly important role and was proved to overcome increased steric instability of epoxides from syn-E to anti-Z isomers.