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Teneligliptin Synthesis Essay

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The first successful use of nosyl derivative of 4-hydroxyproline (12c) in nucleophilic substitution with 1-(2-pyrimidyl)piperazine has been reported.ref This activated nosyl derivative was used as intermediate during the synthesis of a dipeptidyl peptidase-4 inhibitor, PF-734200, now known as Gosogliptin. To our delight, they adopted and executed similar route of synthesis for gosogliptin (PF-734200) as we have proposed in Scheme 2 for teneligliptin. Further, nosylate has also been used on pilot-plant scale in the alkylation of (R)-glycidyl nosylate.ref These reports suggested that Boc-trans-4-hydroxy-L-proline methyl ester (12c) can be activated in SN2 conditions by converting it into a nosyl derivative and this method would be suitable for commercial use. …show more content…

Thus, adopting the same synthetic strategy for teneligliptin as described for PF-734200 by Pfizerref, optimization studies were carried out to improve the reaction condition and overall yield. The major key difference between PF-734200 and teneligliptin was in piperazinyl moiety, in PF-734200, piperazine is linked with pyrimidine where as in teneligliptin it was connected to 3-methyl-1-phenylpyrazole moiety. To know whether this structural difference in nucleophile may impact its reactivity in SN2 conditions with different activated form of Boc-trans-4-hydroxy-L-proline methyl ester (12) such as mesylate (12a), p-toluenesulfonate (12b) and nosylate (12c), reaction of 4, was performed with 12a, 12b and 12c. The 1-(3-methyl-1-phenyl-1H-pyrazol-5-yl)piperazine 4 used in the process was synthesized in bulk as per reported procedeureref with modified work up required for scale up point of

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