Assignment and Stereocontrol of Hibarimicin Atropoisomers
摘要:
A stereochemical feature of the hibarimicins is a central biaryl (HMP-Y6) or aryl-quinone (hibarimicinone) incorporated as a single atropodiastereomer. Herein, a chiral resolution and deracemization process to access optically enriched biaryls aR-3 and aS-3 is described. From these atropoenantiomers the BCD-EFG ring system of HMP-Y6 is constructed [(+)-aR-7]. Comparison of CD spectra of aR-7 to HMP-Y6 leads to the assignment of HMP-Y6 and hibarimicin B atropoisomers as aR and aS, respectively.
Assignment and Stereocontrol of Hibarimicin Atropoisomers
摘要:
A stereochemical feature of the hibarimicins is a central biaryl (HMP-Y6) or aryl-quinone (hibarimicinone) incorporated as a single atropodiastereomer. Herein, a chiral resolution and deracemization process to access optically enriched biaryls aR-3 and aS-3 is described. From these atropoenantiomers the BCD-EFG ring system of HMP-Y6 is constructed [(+)-aR-7]. Comparison of CD spectra of aR-7 to HMP-Y6 leads to the assignment of HMP-Y6 and hibarimicin B atropoisomers as aR and aS, respectively.
Dearomatization of Biaryls through Polarity Mismatched Radical Spirocyclization
作者:Carlos R. Azpilcueta‐Nicolas、Derek Meng、Simon Edelmann、Jean‐Philip Lumb
DOI:10.1002/anie.202215422
日期:2023.2
A redox-neutral dearomatization transforms biaryls into complex spirocycles commonly found in bioactive natural products. This polaritymismatchedradicalspirocyclization tolerates diverse functional groups and is applied in the regioselective synthesis of 2,4- and 2,5-cyclohexadienones. The first synthesis of denobilone A, a cytotoxic plant metabolite, showcases its utility to access underexplored