O,ω‐Unsaturated N‐tosyl alkoxyamines undergo unexpected RhIII‐catalyzed intramolecular cyclization by oxyamination to produce oxygen‐containing heterocycles. Mechanistic studies show that an aziridine intermediate seems to be responsible for the formation of the heterocycles, possibly via a RhV species.
Ketone Formation from Carboxylic Acids by Ketonic Decarboxylation: The Exceptional Case of the Tertiary Carboxylic Acids
作者:Borja Oliver-Tomas、Michael Renz、Avelino Corma
DOI:10.1002/chem.201702680
日期:2017.9.18
For the reaction mechanism of the ketonic decarboxylation of two carboxylic acids, a β‐keto acid is favored as key intermediate in many experimental and theoretical studies. Hydrogen atoms in the α‐position are an indispensable requirement for the substrates to react by following this mechanism. However, isolated observations with tertiary carboxylic acids are not consistent with it and these are revisited
1,3-Diyl trapping reactions. Fundamental investigations with application to the synthesis of linearly fused tricyclopentanoids
作者:R.Daniel Little、George W. Muller、Manuel G. Venegas、Gary L. Carroll、Ahmed Bukhari、Larry Patton、Keith Stone
DOI:10.1016/0040-4020(81)80003-8
日期:1981.1
no practical effect upon the outcome of the trapping reaction. The intramolecular process is stereospecific with respect to diylophile geometry, and highly stereoselective with respect to the ring junction stereochemistry. Finally, an abortive attempt to synthesize the marine natural product Δ9(12)-capnellene (19) as well as a successful synthesis of the mold metabolite d,l- hirsutene (18) is presented