Tandem alkyne insertion and allyl sulfonium ylide rearrangement of γ,δ-alkynyl-α′-diazoketones
作者:Thomas R. Hoye、Christopher J. Dinsmore
DOI:10.1016/0040-4039(92)88041-3
日期:1992.1
catalytic rhodium carboxylate dimer and diallylsulfide (1.1 equiv), undergo sequential alkyneinsertion/ylide formation/sigmatropic rearrangement to give γ-allylthio cyclic enones. This transformation was used to probe the influence of alkyne substituents on 5-exo vs. 6-endo cyclization selectivity in the alkyneinsertion event.
Double (internal/external) alkyne insertion reactions of α-diazoketones
作者:Thomas R. Hoye、Christopher J. Dinsmore
DOI:10.1016/s0040-4039(00)79368-3
日期:1991.7
Acetylenic α-diazoketone 5, when treated with Rh2(OAc)4 and several different alkynes, gives alkyneinsertion/cyclopropenation products. Subsequent catalytic ring opening reactions demonstrate a highly regioselective net double alkyneinsertion process and a new dihydropentalenone synthesis.