Lanthanide(III) trifluoromethanesulfonates (triflates), such as Yb(OTf)3, Nd(OTf)3 and Gd(OTf)3, catalyze in a extraordinarily efficient way the aminolysis of 1,2-epoxides, affording the corresponding β-amino alcohols, at room temperature and in a non-protic solvent (CH2Cl2 or toluene), in very good yields. The reactions are completely anti stereoselective and highly regioselective.
Diisopropoxyaluminium Trifluoroacetate: A New Promoter for Aminolysis of Epoxides
作者:Sriram Rampalli、Sachin S. Chaudhari、Krishnacharya G. Akamanchi
DOI:10.1055/s-2000-6235
日期:——
Aminolysis of symmetrical as well as unsymmetrical epoxides using various amines in the presence of diisopropoxyaluminium trifluoroacetate (DIPAT) as a new promoter gave 1,2-amino alcohols in excellent yields at room temperature with good to excellent selectivities.
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