Methods for preparing an inhibitor of dipeptidyl peptidase IV, as well as formulations of such inhibitors of dipeptidyl peptidase IV that have a high degree of stability including under warm, humid storage conditions.
Enantioselective addition of methyllithium to aromatic imines catalyzed by C2 symmetric tertiarydiamines is described. Eleven diamines have been tested, for which dramatic effect of the nitrogen substitution has been observed. Diamines bearing hindered group close to the nitrogen led to racemic product while homologous hindered diamines led to the best results. Enantiomeric excess up to 74% could
New chiraldiamines were prepared, based on the cyclohexane diamine core. The two different substituents on each nitrogen allow this heteroatom to become a stereogenic center upon chelation with a metal, such as lithium. The enantioselective addition of MeLi to imines, with ee's up to 68%, illustrates the validity of this concept.
METHOD FOR PREPARING ORTHO-SUBSTITUTED AMINOFERROCENES
申请人:Metallinos Costa
公开号:US20100137588A1
公开(公告)日:2010-06-03
The present disclosure relates to a method for preparing an ortho-substituted aminoferrocene comprising reacting an aminoferrocene with a Lewis acid and a lithiating reagent in the presence of an electrophile to form the ortho-substituted aminoferrocene.