Selective acylation of a sterically hindered hydroxyl group of unsymmetrical diols containing a primary hydroxyl group such as 1,5-hexanediol in the presence of silica gel with acetyl chloride
(EN) A process for synthesizing enantiomerically pure chiral secondary alcohol compounds linked to a heterocyclic core moiety, using a natural chiral molecule starting material. The inventive process is particularly useful for bulk manufacturing of chiral secondary alcohol compounds.(FR) Procédé de synthèse de composés d'alcool secondaires chiraux purs sur le plan énantiomère et liés à une fraction de noyau hétérocyclique au moyen d'un matériau de départ à molécules chirales naturelles. Le procédé selon l'invention est particulièrement utile pour la fabrication en masse de composés d'alcools secondaires chiraux.
Selective Monoacetylation of Unsymmetrical Diols Catalyzed by Silica Gel-Supported Sodium Hydrogen Sulfate
作者:Gary W. Breton
DOI:10.1021/jo971367y
日期:1997.12.1
Acetylation of unsymmetrical diols in the presence of Al2O3
作者:Gary W. Breton、Melissa J. Kurtz、Sharyn L. Kurtz
DOI:10.1016/s0040-4039(97)00756-9
日期:1997.6
The effect of the presence of chromatographic grade Al2O3 on the acetylation of a series of unsymmetrical 1,5-diols was investigated. For diols containing both a primary and a secondary hydroxyl group, it was observed that higher yields of the more hindered secondary acetates were formed in the presence of Al2O3 than the corresponding reactions in solution. (C) 1997 Elsevier Science Ltd.