A concisetotalsynthesis of (-)-muricatacin and (-)- ISO-cladospolide B has been achieved by using chemoselective cross-metatheses and asymmetric dihydroxylations. These key reactions allow a fast access to α-hydroxybutyrolactones.
通过使用化学选择性交叉复分解和不对称二羟基化,已经实现了 (-)-muricatacin 和 (-)- ISO-cladospolide B 的简明全合成。这些关键反应可以快速获得 α-羟基丁内酯。
Stereochemical Assignment of the Fungal Metabolites Pestalotiopsones D and E through Enantiopure Synthesis
作者:Andrew Michael Beekman、Russell Allan Barrow
DOI:10.1021/np400473u
日期:2013.11.22
of pestalotiopsones D (4) and E (5) were elucidated through total synthesis of both the R and S enantiomers, allowing for the assignment of the stereochemistry of the natural compounds as the (+)-S enantiomers. The key steps include homologation of a substituted benzoic acid to the appropriate phenylacetate derivative using Birchreductivealkylation, an oxa-Michael cyclization induced by microwave irradiation
Syntheses of Cytosporones A, C, J, K, and N, Metabolites from Medicinal Fungi
作者:Andrew M. Beekman、Russell A. Barrow
DOI:10.1071/ch15144
日期:——
compounds for the first time. The key steps included a recently described homologation of benzoic acid to the analogous phenyl acetate using Birchreductivealkylation conditions, acylation of the appropriate phenyl acetate derivative, and a selective reduction and spontaneous biomimetic lactonization to yield the 3-isochromanone skeleton. The synthesized natural products were evaluated for their biological
Asymmetric synthesis of the constitutive C22-carboxylic acid of macroviracin A
作者:Seema V. Kanojia、Sucheta Chatterjee、Sunita Gamre、Subrata Chattopadhyay、Anubha Sharma
DOI:10.1016/j.tet.2015.01.010
日期:2015.3
An efficient asymmetricsynthesis of the C22-trihydroxy fatty acidcomponent of macroviracin A has been developed. The key steps were highly enantioselective (i) lipase-catalyzed acylation, (ii) InCl3-(S)-BINOL mediated allylation, and (iii) asymmetric dihydroxylation (ADH) reaction. The moderate diastereoselectivity of the ADH reaction was overridden by converting the resultant diol diastereomers
Stereoselective Total Synthesis of (-)-Isocladospolide B and Cladospolide B and C
作者:J. Yadav、S. Mandal
DOI:10.1055/s-0031-1289868
日期:2011.12
The enantioselective synthesis of bioactive butenolides isocladospolide B, cladospolide B, and cladospolide-C has been achieved from (S)-propylene oxide. Of the three stereogenic centers, the C-4/C-5 vic-diol was obtained using diastereo- and enantioselective Brown hydroxycrotylation, while the C-11 stereocenter was created by Jacobsen hydrolytic kinetic resolution.