Stereoinvertive Deoxyamination of trans-2-Aminocyclohexanol Using Bose–Mitsunobu Azidation and Staudinger Reaction for the Stereoselective Synthesis of Edoxaban

Abstract

Stereoinvertive deoxyamination involving Bose−Mitsunobu azidation and the Staudinger reaction, which proceeds under mild conditions in the presence of a neighboring group, was successfully applied for the synthesis of edoxaban. The one-pot process allowed access to key intermediates of edoxaban without isolating azide intermediates. Furthermore, the efficiency of the Bose−Mitsunobu azidation was dramatically improved by changing the substituent on the neighboring group from the Boc group to a thiazole carbonyl unit.