Titanium(II)-based Z-reduction of alkynes. Syntheses of deuterium labelled linolenic and oleic acids and (3E,8Z,11Z )-tetradeca-3,8,11-trienyl acetate, the sex pheromone of a tomato pest, Scrobipalpuloides absoluta
Titanium(II)-based Z-reduction of alkynes. Syntheses of deuterium labelled linolenic and oleic acids and (3E,8Z,11Z )-tetradeca-3,8,11-trienyl acetate, the sex pheromone of a tomato pest, Scrobipalpuloides absoluta
Copper- or iron-catalyzed oxidative rearrangement of bicy- clo[n.1.0]alkan-1-ols yields 3-hydroperoxycycloalkanones and/or bicyclic peroxyhemiketals, which are transformed into 2,3-epoxy- cycloalkanones by treatment with a base.
Radical-induced epoxide fragmentation chemistry. n-Bu3Sn· radical catalyzed isomerization of epoxyketones to carbocycles
作者:Viresh H. Rawal、Venkat Krishnamurthy、Agnes Fabre
DOI:10.1016/s0040-4039(00)60475-6
日期:1993.4
Cyclic alpha,beta-epoxyketones are converted to bi- or tricyclic beta-hydroxyketones in the presence of n-Bu3Sn. radical. Addition of n-Bu3Sn. to the carbonyl group gives a ketyl radical that triggers the epoxide fragmentation which is then followed by a 1,5-hydrogen abstraction and cyclization. Reversibility in the last two steps of the sequence is demonstrated.