Stereoselective synthesis of alicyclic ketones: A hydrogen borrowing approach
作者:Roly J. Armstrong、Wasim M. Akhtar、James R. Frost、Kirsten E. Christensen、Neil G. Stevenson、Timothy J. Donohoe
DOI:10.1016/j.tet.2019.130680
日期:2019.11
A highly diastereoselective annulation strategy for the synthesis of alicyclic ketones from diols and pentamethylacetophenone is described. This process is mediated by a commercially available iridium(III) catalyst, and provides efficient access to a wide range of cyclopentane and cyclohexane products with high levels of stereoselectivity. The origins of diastereoselectivity in the annulation reaction
highly regioselective, fluoride‐catalyzed hydrosilylation of β‐hydroxy epoxides has been developed. The reaction is modular and applicable to the synthesis of a broad range of 1,4‐diols. Fluoride is crucial for two reasons: First, it promotes the formation of a silyl ether (which contains a Si‐H bond) and, second, it enables ringopening by an intramolecular SN2 reaction through activation of the silane
已经开发出一种新型的高度区域选择性,氟化物催化的β-羟基环氧化物的氢化硅烷化方法。该反应是模块化的,适用于多种1,4-二醇的合成。氟化物至关重要是因为两个原因:首先,它促进了甲硅烷基醚(含有Si-H键)的形成;其次,它通过分子内的S N 2反应通过硅烷的活化而使开环成为可能。该反应可以在空气中进行。
Amphidinolides: Unique Macrolides from Marine Dinoflagellates