Structural, Mechanistic, Spectroscopic, and Preparative Studies on the <i>Lewis</i>
Base Catalyzed, Enantioselective Sulfenofunctionalization of Alkenes
作者:Eduard Hartmann、Scott E. Denmark
DOI:10.1002/hlca.201700158
日期:2017.9
with the spectroscopic identification of putative thiiranium ion intermediates generated in the enantiodetermining step. The structural insights gleaned from these studies informed the design of new catalyst architectures to improve enantioselectivity. In addition, structural modification of the sulfenylating agents had a significant and salutary effect on the enantioselectivity of sulfenofunctionalization
Mechanistic, crystallographic, and computational studies on the catalytic, enantioselective sulfenofunctionalization of alkenes
作者:Scott E. Denmark、Eduard Hartmann、David J. P. Kornfilt、Hao Wang
DOI:10.1038/nchem.2109
日期:2014.12
of vicinal heteroatomic substituents into organic molecules is one of the most powerful ways of adding value and function. Although many methods exist for the introduction of oxygen- and nitrogen-containing substituents, the number of stereocontrolled methods for the introduction of sulfur-containing substituents pales by comparison. Previous reports fromour laboratories have described sulfenofunctionalizations
Preparation of a Diisopropylselenophosphoramide Catalyst and its Use in Enantioselective Sulfenoetherification
作者:Scott Denmark
DOI:10.15227/orgsyn.096.0400
日期:——
Catalytic Asymmetric Thiofunctionalization of Unactivated Alkenes
作者:Scott E. Denmark、David J. P. Kornfilt、Thomas Vogler
DOI:10.1021/ja2064395
日期:2011.10.5
Catalytic asymmetric sulfenylation of double bonds has been achieved using a BINAM-based phosphoramide catalyst and an electrophilic sulfur source. Simple alkenes as well as styrenes afforded sulfenylated tetrahydrofurans and tetrahydropyrans by closure with pendant hydroxyl or carboxyl groups. Intermolecular thiofunctionalizations were also achieved with simple alcohols or carboxylic acids as the nucleophiles.
Synthesis and Reactivity of Enantiomerically Enriched Thiiranium Ions
作者:Scott E. Denmark、Thomas Vogler
DOI:10.1002/chem.200901377
日期:2009.11.2
Enantiomericallyenrichedthiiraniumion 5 has been prepared by silver‐assisted ionization of chloro sulfide 4 at −20 °C. This thiiraniumion is configurationally stable in solution up to room temperature as demonstrated by the stereospecific capture of the ion by various oxygen‐ and nitrogen‐based nucleophiles. Both isolated olefins and weak Lewis bases can promote the racemization of 5 but these