Abstract
All four isomers of the spermine alkaloid kukoamine were unambiguously prepared through diacylation with O,O′-dibenzylcaffeyl chloride of suitably protected (benzyl and/or trityl groups) spermine derivatives, assembled on solid and/or in liquid phase using β-alanine and γ-aminobutyric acid, followed by simultaneous N- and O- deprotection and double bond reduction using catalytic hydrogenation.
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