Catalytic Enantioselective 1,2-Diboration of 1,3-Dienes: Versatile Reagents for Stereoselective Allylation
作者:Laura T. Kliman、Scott N. Mlynarski、Grace E. Ferris、James P. Morken
DOI:10.1002/anie.201105716
日期:2012.1.9
More with boron: The development of catalyticenantioselective 1,2‐diboration of 1,3‐dienes enables a new strategy for enantioselective carbonyl allylation reactions (see scheme). These reactions occur with outstanding levels of stereoselection and can be applied to both monosubstituted and 1,1‐disubstituted dienes. The carbonyl allylation reactions provide enantiomerically enriched functionalized
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.
Stereo- and Regiocontrolled Methylboration of Terminal Alkynes
作者:Oleksandr Zhurakovskyi、Rafael M. P. Dias、Adam Noble、Varinder K. Aggarwal
DOI:10.1021/acs.orglett.8b01252
日期:2018.5.18
A scalable and operationally simplesynthesis of trisubstituted alkenyl boronic esters has been achieved using a Zr-catalyzed carboalumination of terminal alkynes followed by in situ transmetalation with i-PrOBpin. The products are formed in good yields and with excellent regioselectivity and perfect stereoselectivity. The new procedure provides a significant improvement over the previously reported
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