Photocatalytic Reductive Radical‐Polar Crossover for a Base‐Free Corey–Seebach Reaction
作者:Karsten Donabauer、Kathiravan Murugesan、Urša Rozman、Stefano Crespi、Burkhard König
DOI:10.1002/chem.202003000
日期:2020.10.9
abstraction of a hydrogen atom followed by radical reduction. The generated nucleophilic intermediate is then capable of adding to carbonyl electrophiles. The obtained dithiane can be easily converted to the valuable α‐hydroxy carbonyl in a subsequent step. The proposed reaction mechanism is supported by emission quenching, radical–radical homocoupling and deuterium labeling studies as well as by calculated
Enantioselective preparation of 2-substituted- 1,3-dithiane 1-oxides using modified sharpless sulphoxidation procedures
作者:Philip C. Bulman Page、Robin D. Wilkes、Emest S. Namwindwa、Michael J. Witty
DOI:10.1016/0040-4020(95)01029-7
日期:1996.2
carried out using modified Sharpless conditions to furnish the corresponding sulphoxides in optically enriched form. Deacylation of 2-acyl-1,3-dithiane 1-oxide derivatives allows the preparation of 2-alkyl-1,3-dithiane 1-oxides and the parent 1,3-dithiane 1-oxide itself in high enantiomeric excesses.
A convenient preparation of symmetrical and unsymmetrical 1,2-diketones: application to fluorinated phenytoin synthesis
作者:Philip C. Bulman Page、Andrew E. Graham、B.Kevin Park
DOI:10.1016/s0040-4020(01)88265-x
日期:1992.1
1,2-Diketones are efficiently produced in two steps by reaction of aldehydes with anions derived from 2-substituted dithianes followed by treatment of the resulting alcohols with NBS in aqueous acetone; phenytolin derivatives were prepared from these diketones by a standard method involving treatment with urea and potassium hydroxide under reflux.
Electrophilic Amination of Ketone Enolates Mediated by the DiTOX Asymmetric Building Block: Enantioselective Formal Synthesis of α-Aminoacids
作者:Philip C. Bulman Page、Michael J. McKenzie、Steven M. Allin、Derek R. Buckle
DOI:10.1016/s0040-4020(00)00923-6
日期:2000.12
Diastereoselective electrophilic amination of enolates derived from 2-acyl-1,3-dithiane 1-oxides is used as the key step for an enantioselective synthesis of two α-hydrazido carboxylic acids, well-known precursors of α-amino acids.
Diastereoselectivity in the addition of grignard reagents to ketones controlled by the 1,3-dithiane 1-oxide asymmetric building block
作者:Philip C. Bulman Page、Jeremy C. Prodger、Donald Westwood
DOI:10.1016/s0040-4020(01)80562-7
日期:1993.1
2-Acyl-1,3-dithiane 1-oxides undergo diastereoselectiveaddition of Grignardreagents; the degree of selectivity observed is highly dependent upon the solvent and the halide counter-ion used; very high selectivities have been observed under certain reaction conditions.