Palladium catalysed γ-addition of pronucleophiles to allenyl sulfieds
摘要:
The palladium catalysed addition of pronucleophiles 1 to allenyl sulfides 2 gives the gamma-addition products in good to high yields, whereas the addition to alkoxyallenes affords the alpha-addition products.
Specific features of the reactions of 2,3-dichloro-1-propene with dibenzylchalcogenides in the system hydrazine hydrate-alkali
作者:E. P. Levanova、V. A. Grabel’nykh、V. S. Vakhrina、N. V. Russavskaya、A. I. Albanov、I. B. Rozentsveig、N. A. Korchevin
DOI:10.1134/s1070363214030050
日期:2014.3
Dibenzyldisulfide and -diselenide react with 2,3-dichloro-1-propene in the system hydrazine hydrate-KOH by the domino mechanism: nucleophilic substitution of the allyl chlorine, dehydrochlorination with participation of the chlorine atom at the sp (2)-carbon atom, allene-acetylene rearrangement, nucleophilic addition of the chalcogenide reagent to the triple bond. The effect of the nature of the chalcogen atom and the benzyl substituent on the studied domino reaction is discussed.
Synthesis and reactivity of dipropargylic disulfides: tandem rearrangements, cyclization, and oxidative dimerization
Synthesis and facile rearrangement and cyclization reaction of new dipropargylic disulfides are described. A possible mechanism for these transformations involving an initial double [2,3]-sigmatropic rearrangement to the elusive diallenyl disulfides via a thiosulfoxide intermediates is suggested.
The palladium catalysed addition of pronucleophiles 1 to allenyl sulfides 2 gives the gamma-addition products in good to high yields, whereas the addition to alkoxyallenes affords the alpha-addition products.