Article

Asymmetric synthesis of four diastereomers of 3-hydroxy-2,4,6-trimethylheptanoic acid: proof of configurational assignment.

Department of Chemistry, Purdue University, West Lafayette, Indiana 47907-2084, USA.
The Journal of Organic Chemistry (Impact Factor: 4.64). 11/2003; 68(20):7841-4. DOI: 10.1021/jo034738l
Source: PubMed

ABSTRACT Four unique diastereomers of 3-hydroxy-2,4,6-trimethylheptanoic acid--(2R,3R,4R), (2S,3R,4R), (2S,3R,4S), and (2R,3R,4S)--the fatty acid component of callipeltin A and D, have been synthesized from commercially available (+)- and (-)-pseudoephedrine propionamide in 6 steps and 59% average overall yield. Comparison of the 1H and 13C NMR and optical rotation data of the resulting isomers with the natural fragment unambiguously verifies the configurational assignment of the natural isomer as (2R,3R,4R).

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