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.
practical phosphine‐catalyzed vicinal difunctionalization of β‐fluoroalkyl α,β‐enones with TMSN3 has been developed. Using dppb as the catalyst, the reaction worked efficiently to yield various β‐amino α‐diazocarbonyl compounds in high yields (up to 94 %). This work marks the first efficient construction of α‐diazocarbonyl compounds by phosphine catalysis. Meanwhile, the asymmetric variant induced by the
contiguous three stereocenters has been a long-standing challenging task in organic synthesis. Herein we present a phoshine-catalyzed highly regio-, diastereo- and enantioselective [3+2] cycloaddition of γ-substitutedallenoates with β-perfluoroalkyl enones, delivering a wide range of densely functionalized perfluoroalkylated cyclopentenes with three contiguous chiral stereocenters.
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.