Rhodium‐Catalyzed Asymmetric Synthesis of β‐Branched Amides
作者:Zhao Wu、Joshua D. Laffoon、Trang T. Nguyen、Jacob D. McAlpin、Kami L. Hull
DOI:10.1002/anie.201610500
日期:2017.1.24
synthesis of chiral β‐branched amides is reported through the highly enantioselective isomerization of allylamines, followed by enamine exchange, and subsequent oxidation. The enamine exchange allows for a rapid and modular synthesis of various amides, including challenging β‐diaryl and β‐cyclic.
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
Catalytic Enantioselective Synthesis of Trisubstituted Secondary Allylic Alcohols Starting from Terminal Alkynes and Aldehydes
作者:Haruki Morimoto、Toshiro Harada
DOI:10.1002/ejoc.201500910
日期:2015.11
for the enantioselective synthesis of β,β-disubstituted allylicalcohols has been developed starting from readily available terminal alkynes and aldehydes. Trisubstituted (E)-vinylaluminium reagents, generated regio- and stereoselectively by the Zr-catalyzed carboalumination of the alkynes with Me3Al, was used in subsequent enantioselective addition reactions with aldehydes using a DPP-H8-BINOL-derived
Chiral Aluminum Catalyst System for the Enantioselective Addition of Vinylaluminum Reagents to Aldehydes: Metal Controlled Reversal of Enantioselectivity
作者:Priyanka A. Adate、Takuya Matsunaga、Hirata Shin、Toshiro Harada
DOI:10.1002/adsc.201600594
日期:2016.12.7
A chiral aluminum catalyst system has been developed for the enantioselective vinylation of aldehydes. β,β‐Disubstituted (E)‐vinylaluminum reagents, generated regio‐ and stereoselectively by the carboalumination of terminal alkynes with trimethylalumunim (Me3Al), were used straightforwardly without transmetalation to vinyltitanium reagents in the subsequent enantioselectiveaddition to aldehydes with
A Novel Method To Generate Chiral Quaternary Carbon Centers of High Enantiomeric Purity Using a Highly Stereoselective Addition of Vinylalanes to a Chiral Aldehyde