A Practical and Efficient Route for the Highly Enantioselective Synthesis of Mexiletine Analogues and Novel β-Thiophenoxy and Pyridyl Ethers

A practical and efficient procedure for the enantioselective synthesis of mexiletine analogues with use of 10% of spiroborate ester 6 as chirality transfer agent is presented. A variety of mexiletine analogues were prepared in good yield with excellent enantioselectivities (91-97% ee) from readily available starting materials. The developed methodology was also successfully applied for the synthesis of novel beta-amino ethers containing thiophenyl and pyridyl fragments.