Flexible Construction of Functionalized‐Pyrroles under Palladium or Copper Catalysis in the Presence of BF
<sub>3</sub>
⋅ Et
<sub>2</sub>
O
作者:Yin Liu、Teng Liu、Biwei Yan、Kun Wei、Wusheng Guo
DOI:10.1002/adsc.202101292
日期:2022.3
friendly operations with the generation of only water as byproduct. The generality of this protocol is demonstrated by the successful preparation of a range of di-, tri-, tetra- and pentasubstituted pyrroles. This methodology is amenable for the synthesis and derivatization of bioactive compounds.
我们开发了一种灵活的方法,能够在 BF 3 ⋅ Et 2 O 的存在下,在钯或铜催化下获得高度官能化的吡咯。这种催化方法利用市售胺作为反应伙伴,具有广泛的范围、可扩展和友好的操作仅产生水作为副产品。该协议的普遍性通过一系列二、三、四和五取代吡咯的成功制备得到证明。该方法适用于生物活性化合物的合成和衍生化。
A nickel-catalyzed <i>anti</i>-carbometallative cyclization of alkyne–azides with organoboronic acids: synthesis of 2,3-diarylquinolines
An anti-carbonickelative cyclization via reversible alkenylnickel E/Z isomerization of 2-azido phenyl propargyl alcohols with aryl boronic acids is achieved using Ni(acac)2 as the catalyst to access 2,3-diaryl quinolines. It represents a rare example of trapping the vinyl metal intermediate with a nitrogen center, a non-carbon center electrophile.
Rhodium-Catalyzed Enantioselective Isomerization of Secondary Allylic Alcohols
作者:Tang-Lin Liu、Teng Wei Ng、Yu Zhao
DOI:10.1021/jacs.7b01096
日期:2017.3.15
The first catalytic enantioselective isomerization of secondary allylicalcohols to access ketones with a α-tertiary stereocenter is presented. The racemic allylicalcohol substrates can be converted to the enantioenriched ketone products in a stereoconvergent fashion. The use of commercially available catalysts and mild reaction conditions makes this an attractive method in stereoselective synthesis
Divergent reactivities in fluoronation of allylic alcohols: synthesis of Z-fluoroalkenes via carbon–carbon bond cleavage
作者:Tang-Lin Liu、Ji’En Wu、Yu Zhao
DOI:10.1039/c7sc00483d
日期:——
the use of N-fluorobenzenesulfonimide (NFSI) under catalyst-free conditions. By using this simple procedure, a wide range of functionalized Z-fluoroalkenes can be accessed in highyield and selectivity from cyclic and acyclic allylic alcohols.
Ru-catalyzed asymmetric hydrogenation of α,β-unsaturated ketones <i>via</i> a hydrogenation/isomerization cascade
作者:Kun Wang、Saisai Niu、Weijun Tang、Dong Xue、Jianliang Xiao、Hongfeng Li、Chao Wang
DOI:10.1039/d4cc00356j
日期:2024.4.16
Ru-catalyzed asymmetric hydrogenation of α-substituted α,β-unsaturatedketones has been developed for the enantioselective synthesis of chiral α-substituted secondary alcohols with high diastereo- and enantioselectivities (up to >99 : 1 dr, 98% ee). Mechanistic experiments suggest that the reaction proceeds via a Ru-catalyzed asymmetric hydrogenation of the CO bond in concert with a base-promoted allylic