Asymmetric oxidation of enol phosphates to α-hydroxy ketones using Sharpless reagents and a fructose derived dioxirane
摘要:
The asymmetric oxidation of a variety of differently substituted, acyclic and cyclic enol phosphates using the Sharpless AD-reagents AD-mix-alpha and AD-mix-beta, and a fructose derived chiral ketone as a catalyst, afforded the corresponding alpha-hydroxy ketones in high enantioselectivity and good yield. The influence of steric and electronic factors of the substrates on the facial stereoselectivity in the reported oxidations was studied. (C) 2012 Elsevier Ltd. All rights reserved.
Asymmetric oxidation of enol phosphates to α-hydroxy ketones by (salen)manganese(III) complex. Effects of the substitution pattern of enol phosphates on the stereochemistry of oxygen transfer
作者:Marek Koprowski、Jerzy Łuczak、Ewa Krawczyk
DOI:10.1016/j.tet.2006.09.100
日期:2006.12
j and Z-configured enol phosphates containing aryloxy substituents in the phosphate group 2b, d, and h afforded optically active α-hydroxy ketones 4a–j of opposite configuration with good to high enantioselectivity. The influence of electronic and steric effects of the enol phosphate substituents on the stereoselectivity of oxidation was studied.
The asymmetric oxidation of a variety of differently substituted, acyclic and cyclic enol phosphates using the Sharpless AD-reagents AD-mix-alpha and AD-mix-beta, and a fructose derived chiral ketone as a catalyst, afforded the corresponding alpha-hydroxy ketones in high enantioselectivity and good yield. The influence of steric and electronic factors of the substrates on the facial stereoselectivity in the reported oxidations was studied. (C) 2012 Elsevier Ltd. All rights reserved.
Aluminum Chloride Promoted Cross-Coupling of Trisubstituted Enol Phosphates with Organozinc Reagents En Route to the Stereoselective Synthesis of Tamoxifen and Its Analogues
and the reaction conditions tolerate various functional groups. The observed reactivity pattern of trisubstituted enol phosphates was used for the stereoselective preparation of tamoxifen and itsanalogues.