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Kriegler, Katharina; Leser, Charlotte; Mayer, Peter and Bracher, Franz (2021): Effective chiral pool synthesis of both enantiomers of the TRPML inhibitor trans-ML-SI3. In: Archiv der Pharmazie, Vol. 355, No. 2, e2100362

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Two independent chiral pool syntheses of both enantiomers of the TRPML inhibitor, trans-ML-SI3, were developed, starting from commercially available (1S,2R)- and (1R,2S)-configured cis-2-aminocyclohexanols. Both routes lead to the target compounds in excellent enantiomeric purity and good overall yields. For the most attractive (-)-trans-enantiomer, the R,R-configuration was identified by these unambiguous syntheses, and the results were confirmed by single-crystal X-ray structure analysis. These effective synthetic approaches further allow flexible variation of prominent residues in ML-SI3 for future in-depth analysis of structure-activity relationships as both the piperazine and the N-sulfonyl residues are introduced into the molecule at late stages of the synthesis.

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