Lewis Acid Mediated “<i>endo-dig</i>” Hydroalkoxylation–Reduction on Internal Alkynols for the Stereoselective Synthesis of Cyclic Ethers and 1,4-Oxazepanes
作者:Santosh J. Gharpure、Dharmendra S. Vishwakarma、Santosh K. Nanda
DOI:10.1021/acs.orglett.7b03241
日期:2017.12.15
Lewis acid mediated 5/6/7-endo-dig hydroalkoxylation–reduction cascade on internal alkynols gave an expedient, stereoselective synthesis of cyclic ethers and 1,4-oxazepanes. The strategy has been extended to the first examples of hydroalkoxylation–alkyne Prins-type cyclization cascade of alkyne-tethered alkynols, giving access to oxa-bicyclic scaffolds. This method was used as the key step in the stereoselective
路易斯酸介导的5/6 / 7-内切挖内部炔醇hydroalkoxylation还原级联得到一个有利的,环醚和1,4- oxazepanes的立体选择性合成。该策略已扩展到炔烃系链炔醇的加氢烷氧基化-炔烃Prins型环化级联的第一个实例,从而可以使用氧杂双环骨架。该方法被用作花环烷AB以及(±)-中心洛宾及其同系物的立体选择性全合成中的关键步骤。