Synthesis of Substituted 3-Hydroxy-2-Furanone Derivatives via an Unusual Enolate Wittig Rearrangement/Alkylative Cyclization Sequence
作者:Renata K. Everett、John P. Wolfe
DOI:10.1021/ol4009188
日期:2013.6.21
Treatment of methyl O-(alkynylmethyl) glycolate derivatives with dialkylboron triflates and Hünig’s base leads to the formation of highly substituted 3-hydroxy-2-furanone derivatives. The transformations appear to proceed via an unusual mechanism involving initial 2,3-Wittig rearrangement of a boron ester enolate followed by an alkylative cyclization reaction that leads to incorporation of an alkyl
Reaction of Alkynes with Iodine Monochloride Revisited
作者:Fabio Bellina、Francesca Colzi、Luisa Mannina、Renzo Rossi、Stephane Viel
DOI:10.1021/jo035372f
日期:2003.12.1
iodocyclization reactions of functionalized acetylenic derivatives with ICl are disfavored in comparison with the corresponding electrophilic addition reactions providing regioselectively (E)-1-chloro-2-iodoethene derivatives. On the contrary, 6-endo-digand 5-exo-dig iodocyclizations of methyl ynoates with ICl seem to be favored in comparison with the corresponding electrophilic addition reactions.
thiyl radical to the alkynyl group followed by radical cyclization of the corresponding vinyl radical onto the O-silyloxime moiety to give cyclic O-silylhydroxylamines in good yields. The reactivity of O-silyloximes in radical cyclization was similar to or even higher than that of O-benzyloximes. Facile removal of the silyl group of the cyclization products leading to hydroxylamines and nitrone formation