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DOI: 10.1055/s-2008-1042941
Synthesis of All Possible Stereoisomers of α-Branched [2.2]Paracyclophanylalkylamines
Publication History
Publication Date:
18 March 2008 (online)

Abstract
The synthesis of all four possible stereoisomers of enantiopure and diastereomerically pure or highly enriched α-branched [2.2]paracyclophanylalkylamines is described. Key step is the nucleophilic 1,2-addition of alkyllithium reagents to hydrazones of 4-formyl[2.2]paracyclophane derived from the chiral auxiliaries SAMP/RAMP and RAMBO/SAMBO via chromatographic epimer separation. Reductive N-N bond cleavage of the resulting hydrazines, followed by treatment with benzyloxycarbonyl chloride afforded the N-Cbz-protected diastereo- and enantiopure (de, ee ÷ 99%) or diastereomerically enriched (de = 89-96%) title amines.
Key words
amines - cyclophanes - hydrazones - nucleophilic addition - planar chirality
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References
CCDC 673149 contains the supplementary crystallographic data for this paper. These data can be obtained free of charge via www.ccdc.cam.ac.uk/data_request/cif, or by e-mailing to data_request@ccdc.cam.ac.uk, or by contacting The Cambridge Crystallographic Data Centre, 12, Union Road, Cambridge CB2 1EZ, UK; fax: +44(1223)336033.
17For an alternative synthesis starting from (R p )-4-formyl[2.2]paracyclophane N,N-dimethylhydrazone, see ref. 7.
18The preparation of this enantiomer was described in a preceding communication, see ref. 7.