Gold-Catalyzed Formation of Oxonium Ions from Enynes and Their Intra- and Intermolecular Trapping with Allylsilanes
作者:Jingwei Li、Xiaoguang Liu、Daesung Lee
DOI:10.1021/ol203206k
日期:2012.1.6
Gold-catalyzed ringclosure of 1,5-enyne containing a silyl ether at the allylic position induces a skeletal rearrangement to form an oxonium intermediate, which then undergoes a smooth allylation in both an intra- and intermolecular manner. In the intramolecularallyltransfer, the additive alcohol becomes positioned on the silicon of the silyl ether by forming a new Si–OR bond, whereas, in the intermolecular
Stereoselective synthesis of 1,6-diazecanes by a tandem aza-Prins type dimerization and cyclization process
作者:Gyeong Un Kim、Hyunmi Cho、Jae Kyun Lee、Jae Yeol Lee、Jinsung Tae、Sun-Joon Min、Taek Kang、Yong Seo Cho
DOI:10.1039/d2cc05133h
日期:——
synthesis of 1,6-diazecanes via a tandem aza-Prins type reaction of N-acyliminium ions with allylsilanes. It involves an aza-Prins type dimerization and cyclization in a single-step operation. This reaction represents the first example of 10-membered N-heterocycle synthesis using an aza-Prins reaction. Also, the interesting formation of an unusual tetracyclic compound through further cyclization of