Synthesis of Thiomorpholin‐3‐ones by a Gold‐Catalysed Oxidative Cyclisation‐Rearrangement Cascade from Ynamides
作者:Thomas Baker、Paul W. Davies
DOI:10.1002/ejoc.201900603
日期:2019.9
A cascade oxidation, sulfonium‐ylide forming cyclisation, and sigmatropicrearrangement has been developed for the expedient synthesis of α,α′‐disubstituted thiomorpholin‐3‐ones. The gold‐catalysed reaction proceeds effectively despite the presence of competing cycloisomerisation and over‐oxidation pathways.
Enantioselective Synthesis of <i>N</i>
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-Acetals by an Oxidative Pummerer-Type Transformation using Phase-Transfer Catalysis
作者:Souvagya Biswas、Koji Kubota、Manuel Orlandi、Mathias Turberg、Dillon H. Miles、Matthew S. Sigman、F. Dean Toste
DOI:10.1002/anie.201711277
日期:2018.1.8
Deuterium‐labelling experiments were performed to identify the stereodiscrimination step of this process. Further analysis of the reaction transition states, by means of multidimensional correlations and DFT calculations, highlight the existence of a set of weak noncovalent interactions between the catalyst and substrate that govern the enantioselectivity of the reaction.