摘要 |
The invention is directed to stereoselective synthesis of compounds of formula (I) or formula (II) or a pharmaceutically acceptable salt, ester, amide, complex, chelate, clathrate, solvate, polymorph, stereoisomer, metabolite or prodrug thereof; wherein R<3>, R<4> and R<5> are defined herein. Compounds of formula (I) and formula (II) are known to be useful in treating arrhythmias. |