An easy route toward enantio-enriched polycyclic derivatives via an asymmetric domino conjugate reduction–aldol cyclization catalyzed by a chiral Cu(I) complex
作者:Julia Deschamp、Thomas Hermant、Olivier Riant
DOI:10.1016/j.tet.2011.07.039
日期:2012.4
A highlyefficient reductive-aldol cyclization mediated by a chiral Cu(I) complex and an organosilane yielded to cyclic or polycyclic derivatives. An excellent control of the selectivities was reached in most cases (dr up to 100:0 and ee up to 95%). After developing the enantioselective intramolecular reductive-aldol methodology, this strategy was successfully used for the synthesis of a key intermediate
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.
Total Synthesis and Late‐Stage C−H Oxidations of
<i>ent</i>
‐Trachylobane Natural Products
作者:Lukas Anton Wein、Klaus Wurst、Thomas Magauer
DOI:10.1002/anie.202113829
日期:2022.1.17
We report an asymmetric synthesis of several ent-trachylobane diterpenoids. The developed strategy is based on the two-phase terpenoidsynthesis concept and involves carbon framework assembly (Cyclase Phase) and aliphatic C−H oxidation (Oxidase Phase). This enabled access to seven natural products and diverse non-natural analogs that were previously inaccessible via enzymatic and/or chemical methods