Rhodium-Catalyzed, Enantioselective Hydroacylation of <i>ortho</i>-Allylbenzaldehydes
作者:Kirsten F. Johnson、Adam C. Schmidt、Levi M. Stanley
DOI:10.1021/acs.orglett.5b02559
日期:2015.10.2
The development of a rhodiumcatalyst for endo- and enantioselective hydroacylation of ortho-allylbenzaldehydes is reported. A catalyst generated in situ from [Rh(COD)Cl]2, (R)-DTBM-SEGPHOS, and NaBARF promotes the desired hydroacylation reactions and minimizes the formation of byproducts from competitive alkene isomerization and ene/dehydration pathways. These rhodium-catalyzed processes generate
rodenticide in racemic form, is performed using a key step of rhodium catalyzed enantioselective intramolecular hydroacylation. Optimization of the last step, condensation of 4-hydroxycoumarin with chiral 3-([1,1′-biphenyl]-4-yl)-1,2,3,4-tetrahydronaphthalen-1-ol, is also discussed. After chromatographic separation of the cis and trans diastereoisomers, the four stereoisomers were all obtained with
A Novel Cyclisation Strategy for the Synthesis of Lactonamycin: A New Route to Highly Functionalised Heterocyclic Rings
作者:Philip Parsons、Johnathan Board、Alexander Waters、Peter Hitchcock、Florian Wakenhut、Daryl Walter
DOI:10.1055/s-2006-951542
日期:——
A novel thermal cascade reaction equivalent to the well-known [2+2+2] cycloaddition has been developed which is clean and reliable and does not involve the use of metal ions. This highly efficient method has been used to construct a model for the synthesis of the antibiotic lactonamycin. The utility of this new sequence for the formation of furans is also reported.
Model studies for the synthesis of the antibiotic lactonamycin and the discovery of new reactions and mechanisms for the construction of substituted heterocycles
作者:Philip J. Parsons、Jonathan Board、Davide Faggiani、Peter B. Hitchcock、Lewis Preece、Alexander J. Waters
DOI:10.1016/j.tet.2010.05.051
日期:2010.8
A new and highly efficient route for the construction of a model for the synthesis of lactonamycin 1 is reported. The chemistry has been utilised for the synthesis of heterocyclic rings, and new reactions for the synthesis of dienes and alkynes are reported. (C) 2010 Elsevier Ltd. All rights reserved.