Stereoselective Directed Cationic Cascades Enabled by Molecular Anchoring in Terpene Cyclases
作者:Andreas Schneider、Philipp Jegl、Bernhard Hauer
DOI:10.1002/anie.202101228
日期:2021.6.7
cascades by exploiting the ability of anchoring dynamic substrates in the active site of terpene cyclases via designed hydrogen bonding. Thereby, it is possible to induce “directed” cyclizations in contrast to established “non-stop” cyclizations (99:1) and predestinate cascade termination at otherwise catalytically barely accessible intermediates. As a result, we are able to provide efficient access to
Titanium-Catalyzed Enantioselective Synthesis of α-Ambrinol
作者:José Justicia、Araceli G. Campaña、Btissam Bazdi、Rafael Robles、Juan M. Cuerva、J. Enrique Oltra
DOI:10.1002/adsc.200700511
日期:2008.3.7
enantioselective synthesis of the odorant compound (−)-α-ambrinol (96% ee) from commercial geranylacetone. The key steps are a Jacobsen’s asymmetric epoxidation and a titanium-catalyzed stereoselective cyclizationinitiated by radical epoxide opening. The oxirane ring opening proceeds with retention of configuration at the epoxide chiralcenter, giving a secondary alcohol which can be advantageously exploited