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© 2016. The asymmetric synthesis of a range of 1,2-anti-1,5-syn-transpentacins, bearing either alkyl, phenyl or hydroxymethyl substituents at the C(5)-position, has been achieved using the diastereoselective conjugate additions of Grignard reagents to an enantiopure β'-amino-α,β-unsaturated ester as the key step. In addition, the doubly diastereoselective conjugate addition of an enantiopure lithium amide reagent to the β'-amino-α,β-unsaturated ester provided access to the corresponding β,β'-diamino ester, which was subsequently converted to both (S,. S)-(2,5-diaminocyclopent-1-yl)methanol and (S,. S)-2,5-diaminocyclopentane-1-carboxylic acid. In each case, the final enantiopure products were obtained as single diastereoisomers (>99:1 dr) in good yields over five steps or fewer from commercially available starting materials.

Original publication




Journal article


Tetrahedron Asymmetry

Publication Date





208 - 221