Tetrahedron Letters p. 3895 - 3898 (1996)
Update date:2022-07-30
Topics:
Bell, David
Davies, Mark R.
Finney, Frances J.L.
Geen, Graham R.
Kincey, Peter M.
Mann, Inderjit S.
In the absence of a donor ligand both the reaction rate and product e.e. of the manganese (III) salen catalysed epoxidation of 2,2-dimethyl-6- pentafluoroethylchromene were dependent on the catalyst loading. Isoquinoline N-oxide was the most effective donor ligand, affording highly efficient epoxidations with catalyst loadings of 0.1-0.4 mol%. These findings allowed the realisation of a concise, inexpensive synthesis of BRL 55834.
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