Binap-silver salts as chiral catalysts for the enantioselective 1,3-dipolar cycloaddition of azomethine ylides and alkenes
Binap-AgSbF6 catalyzed 1,3-dipolar cycloadditions between azomethine ylides and electrophilic alkenes are described and compared with analogous transformations mediated by other Binap-silver(I) salt complexes. Maleimides and 1,2-bis(phenylsulfo
Mancebo-Aracil, Juan,Martin-Rodriguez, Maria,Najera, Carmen,Sansano, Jose M.,Costa, Paulo R.R.,De Lima, Evanoel Crizanto,Dias, Ayres G.
p. 1596 - 1606
(2013/02/23)
Dichloromethylenation of Lactones. 6. Efficient Synthesis of Dichloroolefins from Lactones and Acetates Using Triphenylphosphine and Tetrachloromethane
Triphenylphosphine and tetrachloromethane react cleanly in refluxing tetrahydrofuran with substituted γ- and δ-lactones and some esters to afford the corresponding dichloroolefins in good yields.This new Wittig-type reaction provides an easy entry to this new class of compounds and tolerates a large of protecting groups.Application of this methodology to the dichloroolefination of simple lactones, suger-derived lactones, and other biologically significant lactones is described.
Lakhrissi, Mohamed,Chapleur, Yves
p. 5752 - 5757
(2007/10/02)
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