Efficient Construction of Polycyclic Derivatives via a Highly Selective Cu<sup>I</sup>-Catalyzed Domino Reductive-Aldol Cyclization
作者:Julia Deschamp、Olivier Riant
DOI:10.1021/ol802879f
日期:2009.3.19
A versatile methodology for the diastereo- and enantioselective domino reductive-aldol cyclizations is reported. By using a copper (I)/diphosphane ligand, various five- and six-membered rings were generated with good to excellent diastereo- and enantioselectivities (cis:trans up to 100:0 and ee up to 95%).
Synthesis of (−)-Mitrephorone A via a Bioinspired Late Stage C–H Oxidation of (−)-Mitrephorone B
作者:Lukas Anton Wein、Klaus Wurst、Peter Angyal、Lara Weisheit、Thomas Magauer
DOI:10.1021/jacs.9b11646
日期:2019.12.18
We present a bioinspired late-stage C-H oxidation of the ent-trachylobane natural product mitrephorone B to mitrephorone A. The realization of this unprecedented transformation was accomplished by either an iron-catalyzed or electrochemical oxidation and enabled access to the densely substituted oxetane in one step. Formation of mitrephorone C, which is lacking the central oxetane unit but features a keto-function at C2, was not formed under these conditions.