Syntheses of Tetrahydropyran Type 8,7′-Neolignans Using a Ring-Expansion Reaction and Tetrahydrofuran Type 8,7′-Neolignans to Discover a Novel Phytotoxic Neolignan
作者:Miyo Tanaka、Hisashi Nishiwaki、Satoshi Yamauchi
DOI:10.1021/acs.jafc.3c01998
日期:2023.6.14
One novel tri-substituted tetrahydropyran type 8,7′-neolignan and its enantiomer with higher enantiomeric excess were synthesized from all cis-tetra-substituted tetrahydrofuran with an iodomethyl group by a hydride or H2 ring-expansion reaction. The normal hydride reductions of C–I bonds of tetra-substituted tetrahydrofurans bearing iodomethyl groups were observed in other 2,3-cis-stereoisomers of
Asymmetric synthesis of (−)-chicanine using a highly regioselective intramolecular Mitsunobu reaction and revision of its absolute configuration
作者:Kenichi Harada、Hiroki Horiuchi、Kazuma Tanabe、Rich G. Carter、Tomoyuki Esumi、Miwa Kubo、Hideaki Hioki、Yoshiyasu Fukuyama
DOI:10.1016/j.tetlet.2011.03.154
日期:2011.6
First asymmetric synthesis of (-)-chicanine has been accomplished in 14 steps by employing the Evans asymmetric syn-selective aldol reaction, diastereoselective hydroboration and an regioselective, intramolecular Mitsunobu etherification. The absolute configuration of (+)- and ()-chicanine has been revised to 2R,3S,4R,5R and 2S,3R,4S,5S, respectively, through CD analysis. (C) 2011 Elsevier Ltd. All rights reserved.