Photolyse de melanges de pentyne-3one-2 et de tetramethylethylene dans C 6 H 6 conduisant aux cis- et trans-ethylidene-4 methylene-5 tetramethyl-2,2,3,3tetrahydrofuranne se transposant envinyldihydrofuranne et en oxetanne。Mecanisme: mise en jeu de carbenes
Regioselective Epoxidations by Cytochrome P450 3A4 Using a Theobromine Chemical Auxiliary to Predictably Produce N-Protected β- or γ-Amino Epoxides
作者:Vanja Polic、Kin Jack Cheong、Fabien Hammerer、Karine Auclair
DOI:10.1002/adsc.201700637
日期:2017.11.23
N-Protected β- and γ-aminoepoxides are useful chiral synthons. We report here that the enzyme cytochrome P450 3A4 can catalyze the formation of such compounds in a regio- and stereoselective manner, even in the presence of multiple double bonds or aromatic substituents. To this end, the theobromine chemical auxiliary is used not only to control the selectivity of the enzyme, but also as a masked amine