A flexible approach to hexahydronaphthalene-1-carboxylates
摘要:
A flexible approach to hexahydronaphthalene-1-carboxylates based on the Favorskii rearrangement of 1,1-dichloro bicyclo[5.4.0]undec-5-en-2-ones has been devised. 1,1-Dichloro bicyclo[5.4.0]undec-5-en-2-ones can be prepared from readily available cyclohexanones by a short sequence. (C) 2011 Elsevier Ltd. All rights reserved.
Tertiary, benzyl, and allylic nitro compounds undergo nuclephilic substitutionreactions with carbonnucleophiles such as electron rich aromatic compounds, allylsilanes, or silyl enol ethers in the presence of SnCl4.
thermodynamically-stable isomers is negligible. On the other hand, the palladium-catalyzed sulfonylation of allylic acetates with sodium benzenesulfinate is accompanied by the isomerization to give the thermodynamically-controlled products selectively. These results can be explained by assuming that allylic nitro compounds are more reactive to the palladium catalyst than allylic acetates and sulfones.
Cyclic α-(nitroalkyl)enones and α-(phenylsulfonylalkyl)enones undergo regioselective substitution of the nitrogroup by relatively soft sulfur, nitrogen and carbon nucleophiles.
Formation of New Phosphates from Aldehydes by a DBU-Catalysed Phospha-Brook Rearrangement in a Polar Solvent
作者:Laurent El Kaïm、Laetitia Gaultier、Laurence Grimaud、Aurélie Dos Santos
DOI:10.1055/s-2005-872670
日期:——
different possible reaction pathways depending on the solvent used. Apolar solvents give the normal Pudovik adduct, whereas the use of DBU in a polar solvent allows the formation of a phosphate ester via phospha-Brook rearrangement of the intermediate hydroxyphosphonate.