Chromium(II) salt mediated reductive transposition of an ester acyl group in ortho-O-acyl benzylic bromides: a ready access to unmasked ortho-hydroxybenzyl ketones and a new route to benzo[b]furans
作者:Beno�t Ledoussal、Alain Gorgues、Andr� Le Coq
DOI:10.1039/c39860000171
日期:——
The mono-σ-bonded organochromium(III) complexes (A) derived from (1) rearrange internally into (B) through an acylestergrouptransposition, selected experimental conditions allowing either a good access to the unmaskedortho-hydroxybenzylketones (2) or a newroute to the 2-substituted benzo[b]furans (3).
衍生自(1)的单σ键合有机铬(III)配合物通过酰基酯基转移在内部重新排列为(B),选择的实验条件使得可以很好地接触未掩盖的邻羟基苄基酮(2)或新的途径取代2-取代的苯并[ b ]呋喃(3)。
Reduction par les sels chromeux de bromures benzyliques ortho-o-acyles avec transposition du groupement acyle
作者:B. Ledoussal、A. Gorgues、A. Le Coq
DOI:10.1016/s0040-4020(01)87790-5
日期:——
σ-bonded organochromium (III) complexes resulting from the reduction of-O-acyl benzylicbromides with CrCl2., undergo an 1,5-transposition of the esteracyl functional group which allows, through selected experimental conditions either a selective access to the unmasked -hydroxybenl ketones or a new preparation of the 2-substituted benzo¦b¦furans . The scope and limitations of the method are presented