Synthesis 2022; 54(17): 3831-3844
DOI: 10.1055/s-0040-1719887
special topic
Special Issue in memory of Prof. Ferenc Fülöp

Stereoselective Synthesis and Applications of Pinane-Based Chiral 1,4-Amino Alcohol Derivatives

Mounir Raji
a   Institute of Pharmaceutical Chemistry, University of Szeged, Interdisciplinary Excellence Center, Eötvös utca 6, 6720 Szeged, Hungary
,
Tam Minh Le
a   Institute of Pharmaceutical Chemistry, University of Szeged, Interdisciplinary Excellence Center, Eötvös utca 6, 6720 Szeged, Hungary
b   MTA-SZTE Stereochemistry Research Group, Hungarian Academy of Science, Eötvös utca 6, 6720 Szeged, Hungary
,
Antal Csámpai
c   Institute of Chemistry, Eötvös Loránd University, P.O. Box 32, 1518 Budapest-112, Hungary
,
Viktória Nagy
d   Institute of Pharmacodynamics and Biopharmacy, Interdisciplinary Excellence Center, University of Szeged, Eötvös utca 6, 6720 Szeged, Hungary
,
István Zupkó
d   Institute of Pharmacodynamics and Biopharmacy, Interdisciplinary Excellence Center, University of Szeged, Eötvös utca 6, 6720 Szeged, Hungary
,
a   Institute of Pharmaceutical Chemistry, University of Szeged, Interdisciplinary Excellence Center, Eötvös utca 6, 6720 Szeged, Hungary
› Author Affiliations
We are grateful for financial support from the Hungarian Research Foundation (NKFI K138871) and Emberi Eroforrások Minisztériuma (Ministry of Human Capacities, Hungary; grant 20391-3/2018/FEKUSTRAT).


Abstract

A new library of pinane-based 1,4-amino alcohols was synthesised and utilised as chiral ligands in enantioselective diethylzinc addition to benzaldehyde. Aldol condensation of (+)-nopinone, derived from (–)-β-pinene, with 2-pyridinecarboxaldehyde gave the key intermediate α,β-unsaturated ketone, which was transformed in diastereoselective reduction, followed by hydrogenation, resulting in 1,4-amino alcohols. On the other hand, epoxidation of the α,β-unsaturated ketone, followed by reduction and then hydrogenation of the pyridine ring, afforded a mixture of 4-amino-2,3-epoxy-1-ols. Stereoselective hydride reduction of the epoxy ketone and subsequent condensation of the resulting products with substituted benzyl bromides provided quaternary ammonium salts, which were subjected to hydride reduction and then hydrogenation, affording 4-amino-2,3-epoxy-1-ol derivatives containing an N-benzylpiperidine moiety. The inhibition of nucleophile-initiated opening of the oxirane ring was interpreted by a systematic series­ of comparative Hartree–Fock modelling study using the 6-31+G(d,p) basis set. The antiproliferative activities of 4-amino-2,3-epoxy­-1-ol derivatives were examined, and structure–activity relationships were studied from the aspects of the stereochemistry of the oxirane ring, saturation, and substituent effects on the piperidine ring system.

Supporting Information



Publication History

Received: 04 November 2021

Accepted after revision: 17 December 2021

Article published online:
23 March 2022

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