Cobalt(II)-catalyzed stereospecific coupling of N-methylanilines with styreneoxides is developed via tandem C–N and C–O bond formation using tert-butyl hydroperoxide (TBHP) as an oxidant. Optically active epoxide can be reacted with high optical purity.
Sn(OTf)2 catalysed regioselective styrene oxide ring opening with aromatic amines
作者:Gabriela Mancilla、Marienca Femenía-Ríos、Antonio J. Macías-Sánchez、Isidro G. Collado
DOI:10.1016/j.tet.2008.09.099
日期:2008.12
Sn(OTf)2 is an efficient and versatile catalyst for the highly regioselective opening of styreneoxide with aromatic amines, which allowed for the preparation of fourteen 2-arylamino-2-phenylethanols, some of them described here for the first time (6g, 6i, 6j, 6k and 6m). Sn(OTf)2 also catalyses the opening of styreneoxide with aliphatic amines in moderate to high yields but with a lower degree of regioselectivity
A transition metal-free facile access to β-amino alcohols via epoxide ring-opening with amine nucleophiles. The process is carried out at room temperature with only 0.5 mol % catalyst loading. A wide spectrum of styrene oxide and aniline derivatives are readily tolerated by this procedure. A highly effective gram-scale synthesis with a high TON=842 is also reported.