Stereoselective Synthesis of Trisubstituted Alkenylboron Reagents by Boron-Wittig Reaction of Ketones
作者:Sheila Namirembe、Chenpeng Gao、Ryan P. Wexler、James P. Morken
DOI:10.1021/acs.orglett.9b01663
日期:2019.6.7
Application of the boron-Wittigreaction to ketone electrophiles provides a straightforward route to trisubstituted alkenylboronic esters. With either a pentamethyldiethylenetriamine or trimethyl-1,4,7-triazacyclononane additive, the olefination can occur with very high levels of stereocontrol and in good chemical yield.
Total Synthesis of Isohericerin, Isohericenone, and Erinacerin A: Development of a Copper-Catalyzed Methylboronation of Terminal Alkynes
作者:Bohyun Mun、Sangyong Kim、Hongju Yoon、Ki Hyun Kim、Yunmi Lee
DOI:10.1021/acs.joc.7b00920
日期:2017.6.16
Efficient and concise approaches for the synthesis of three bioactive natural products, isohericerin, isohericenone, and erinacerin A, are described in this paper. The key reactions employed include a Mannich reaction with commercially available hydroxybenzoate and subsequent one-pot lactamization to afford the common precursor isoindolinone in 3 steps and a Suzuki–Miyaura coupling reaction to connect