Synthesis of 1,3‐Bis‐(boryl)alkanes through Boronic Ester Induced Consecutive Double 1,2‐Migration
作者:Cai You、Armido Studer
DOI:10.1002/anie.202007541
日期:2020.9.21
approach for the preparation of 1,3‐bis‐(boryl)alkanes is introduced. It is shown that readily generated vinylboron ate complexes react with commercially available ICH2Bpin to valuable 1,3‐bis‐(boryl)alkanes. The introduced transformation, which is experimentally easy to conduct, shows broad substrate scope and high functional‐group tolerance. Mechanistic studies reveal that the reaction does not proceed
Palladium-catalyzed Suzuki-type couplings of 3-pyridyl triflates with alkenylpinacol boronates proceed in good to excellent yields. Optimized conditions use Pd(PPh3)4 (10 mol%) as catalyst with K3PO4 (3 equiv) as base in 1,4-dioxane.
Synthesis of cananodine by intramolecular epoxide opening
作者:Patrick Shelton、Toby J. Ligon、Jennifer M. Dell (née Meyer)、Loagan Yarbrough、James R. Vyvyan
DOI:10.1016/j.tetlet.2017.07.080
日期:2017.8
is a guaipyridine alkaloid with activity against liver cancer. Cananodine was synthesized using a remarkable intramolecular opening of a trisubstituted epoxide as the key step in construction of the seven-membered carbocycle of the target. The epoxide opening strategy allows all four stereoisomers of cananodine to be prepared.
Stereodivergent Access to Trisubstituted Alkenylboronate Esters through Alkene Isomerization
作者:Lucas Segura、Itai Massad、Masamichi Ogasawara、Ilan Marek
DOI:10.1021/acs.orglett.1c03513
日期:2021.12.3
We report an efficient method for the preparation of synthetically valuable trisubstituted alkenylboronate esters through alkene isomerization of their readily available 1,1-disubstituted regioisomeric counterparts. Either stereoisomer of the target alkenylboronate motif can be obtained at will from the same starting material by employing different isomerization catalysts.