The Rh(III)-catalyzed C–H activation initiated cyclization of benzoicacids with electron-rich geminal-substituted vinyl acetates was described. The reaction was employed to prepare a range of 3-aryl and 3-alkyl substituted isocoumarins selectively.
One‐Pot Synthesis of 3‐Alkylidenephthalides from Benzoic Acids by a Rhodium‐Catalyzed
<i>ortho</i>
‐CH Acylation Process
作者:Grégory Danoun、Patrizia Mamone、Lukas J. Gooßen
DOI:10.1002/chem.201303426
日期:2013.12.16
CH functionalization: A [Rh(cod)Cl]2/CsF (cod=1,5‐cyclooctadiene) catalyst system was found to promote the straightforward synthesis of 3‐alkylidenephthalides from benzoicacids and aliphatic acids or anhydrides through a one‐pot CH acylation/acylalization/elimination cascade (see scheme).
Acid–base-sensitive allylic oxidation of 2-allylbenzoic acids to form phthalides
作者:Le Thi Ngoc Chuc、Thi Anh Hong Nguyen、Duen-Ren Hou
DOI:10.1039/d0ob00303d
日期:——
corresponding phthalides selectively. Mechanistic studies, including the corresponding reaction of (E)-2-(1-propenyl)benzoicacid to 3-methylisocoumarin, isomerization reaction of 3-vinylphthalide to 3-ethylidenephthalide, and the kinetic isotope effect using 2-(1,1-d2-allyl)benzoicacid, revealed the competition between Wacker-type oxidation and allylic C-H cleavage, which is the key step to generating