Stereoselective convergent total synthesis of oxylipins
作者:Rodney A. Fernandes、Sandhya S. Yadav、Sanjita Moharana
DOI:10.1039/d4ob00282b
日期:——
We synthesized stereoselectively four stereoisomers of oxylipins (1a–d) by a convergent approach based on chiral catalysis. The synthetic approach involved sequential assembly of two key fragments – ene-diol and allyl alcohol – for an intended convergent cross-metathesis reaction to join these fragments. The key steps include Sharpless kinetic resolution, asymmetric dihydroxylation and Grubbs cross-metathesis
<i>anti</i>-Diols from α-Oxyaldehydes: Synthesis and Stereochemical Assignment of Oxylipins from <i>Dracontium loretense</i>
作者:Gayan A. Abeykoon、Shreyosree Chatterjee、Jason S. Chen
DOI:10.1021/ol501263y
日期:2014.6.20
Differentially protected 1,2-diols were synthesized by enantioselective aldehyde α-oxygenation followed by organomagnesium or -lithium addition. Contrary to a previous report, the resultant diols possess an anti configuration. Good selectivity was achieved regardless of the hybridization state of the nucleophile or the presence or absence of branching. This method was applied to short syntheses of all possible stereoisomers of two oxylipins from Dracontium loretense with incomplete stereochemical assignments. Spectroscopic comparisons between the synthetic and natural oxylipins led to unambiguous assignments.