[EN] PROCESS FOR THE MANUFACTURE OF (+)-BIOTIN<br/>[FR] PROCÉDÉ DE FABRICATION DE (+)-BIOTINE
申请人:DSM IP ASSETS BV
公开号:WO2009049476A1
公开(公告)日:2009-04-23
Disclosed are processes for preparing synthetic biotin intermediates and a process for preparing biotin using said intermediates. In particular, disclosed is a process for the stereoselective total synthesis of the natural product (+)-biotin of formula (I).
Here we describe an asymmetric [3,3]-sigmatropicrearrangement of aryl iodanes that enables the enantioselective α-arylation of chiral 2-oxazolines, thereby producing valuable, chiral α-aryl carbonyl compounds. The success of this protocol hinges on the selective assembly of aryl iodanes with 2-oxazolines and the smooth deprotonation of the in situ generated iodonium-imine species. The nearly neutral