Enantioselective Conjunctive Cross-Coupling of Bis(alkenyl)borates: A General Synthesis of Chiral Allylboron Reagents
作者:Emma K. Edelstein、Sheila Namirembe、James P. Morken
DOI:10.1021/jacs.7b01774
日期:2017.4.12
conjunctive cross-coupling is used for the synthesis of enantioenriched allylboron reagents. This reaction employs nonsymmetric bis(alkenyl)borates as substrates and appears to occur by a mechanism that involves selective activation of the less substituted alkene followed by migration of the more substituted alkene during the course of a Pd-induced metalate rearrangement.
A non-enzymatic acetyl transfer-based kinetic resolution of primary allylic amines is reported. The process involves the use of (1S,2S)-1 in conjunction with a supported ammonium salt and affords the corresponding enantio-enriched N-acetylated allylic amines with unprecedented levels of selectivity (s-factors up to 34).
Application of LB-Phos·HBF4 in the Suzuki Coupling Reaction of 2-Bromoalken-3-ols with Alkylboronic Acids
作者:Binjie Guo、Chunling Fu、Shengming Ma
DOI:10.1002/ejoc.201200350
日期:2012.7
LB-Phos·HBF4 was used in the Suzukicouplingreaction of 2-bromoalken-3-ols with alkylboronicacids to give the coupling products in moderate to good yields. Substituents such as benzyl, phenyl, allyl, and alkyl are tolerated at the 1- and 3-positions of the 2-bromoalken-3-ols. The reactions of both primary and secondary alkylboronicacids proceed smoothly.