Chemo-enzymatic enantio-convergent asymmetric total synthesis of (S)-(+)-dictyoprolene using a kinetic resolution—stereoinversion protocol
摘要:
A single enantiomer of a (stereo)chemically labile allylic-homoallylic alcohol was obtained in 91% e.e. and 96% yield from the racemate by employing a lipase-catalysed kinetic resolution coupled to in situ inversion under carefully controlled (Mitsunobu) conditions in order to Suppress side reactions, such as elimination and racemisation. This technique was Successfully applied to an enantio-convergent asymmetric total synthesis of the algal fragrance component (S)-dictyoprolene. (C) 2003 Elsevier Ltd. All rights reserved.
Two new odoriferous compounds, dictyoprolene and neodictyoprolene have been isolated from the brown alga Dictyopteris prolifera and their structures determined by chemical and spectral means. Synthesis of optically active and racemic has been made. Dictyoprolene and neodictyoprolene have been shown to be the acetates of the 1-undecen-3-ols, the postulated biosynthetic precursors of various C11 hydrocarbons