Synthesis of Enantiopure 1-Arylprop-2-en-1-ols and Their tert-Butyl Carbonates
摘要:
Enantiomerically pure 1-arylpropenols 8 have been prepared by resolution of the corresponding racemates, using the lipase formulation Novozyme 435. Deprotonation of the latter alcohols with n-BuLi, followed by derivatization with (t-BUO)(2)CO, afforded the corresponding carbonates 5. Optimization of the process is presented.
Picolinaldehyde‐Zinc(II)‐Palladium(0) Catalytic System for the Asymmetric <i>α‐</i>Allylation of N‐Unprotected Amino Esters
作者:Qian Li、Yan Liu、Can Li
DOI:10.1002/chem.202301348
日期:2023.8.10
atom-economic catalytic method for asymmetric α-allylation of N-unprotected amino esters was achieved to provide enantioenriched α-quaternary α-allyl amino esters with high yields and high enantioselectivities. To achieve this transformation, we utilized a ternary catalytic system consisting of a chiral phosphoramidite-palladium complex, an achiral picolinaldehyde, and the Lewis acid Zn(OTf)2.
The regio- and enantioselective allylic amination of racemic monosubstituted allylic esters, such as 1-arylallyl acetates, with cyclic secondary amines has been accomplished. The RuCl3/(S,S)-ip-pybox catalyst system has effectively catalyzed the reaction to afford the enantiomerically enriched branch-type allylic amines with perfect regioselectivity and high enantioselectivity.
Synthesis of Enantiopure 1-Arylprop-2-en-1-ols and Their <i>tert</i>-Butyl Carbonates
作者:Jan Štambaský、Andrei V. Malkov、Pavel Kočovský
DOI:10.1021/jo801874r
日期:2008.11.21
Enantiomerically pure 1-arylpropenols 8 have been prepared by resolution of the corresponding racemates, using the lipase formulation Novozyme 435. Deprotonation of the latter alcohols with n-BuLi, followed by derivatization with (t-BUO)(2)CO, afforded the corresponding carbonates 5. Optimization of the process is presented.