PROCESS FOR PREPARING ENANTIOMERICALLY PURE FLUORINATED EPOXYCHROMANS
申请人:SmithKline Beecham plc
公开号:EP0626967B1
公开(公告)日:2003-10-08
Tetrahedron Letters. 1996, 37, 3895-3898
作者:
DOI:——
日期:——
The effect of catalyst loading and donor ligands in the Mn(III) salen catalysed chiral epoxidation of chromenes: Synthesis of BRL 55834
作者:David Bell、Mark R. Davies、Frances J.L. Finney、Graham R. Geen、Peter M. Kincey、Inderjit S. Mann
DOI:10.1016/0040-4039(96)00683-1
日期:1996.5
In the absence of a donorligand both the reaction rate and product e.e. of the manganese (III) salencatalysedepoxidation of 2,2-dimethyl-6-pentafluoroethylchromene were dependent on the catalystloading. Isoquinoline N-oxide was the most effective donorligand, affording highly efficient epoxidations with catalystloadings of 0.1–0.4 mol%. These findings allowed the realisation of a concise, inexpensive