Biocatalytic Desymmetrization of Prochiral 3-Aryl and 3-Arylmethyl Glutaramides: Different Remote Substituent Effect on Catalytic Efficiency and Enantioselectivity

2018 ◽  
Vol 360 (23) ◽  
pp. 4594-4603 ◽  
Author(s):  
Yu-Fei Ao ◽  
Li-Bin Zhang ◽  
Qi-Qiang Wang ◽  
De-Xian Wang ◽  
Mei-Xiang Wang
Keyword(s):  
Substituent Effect ◽  
Catalytic Efficiency ◽  
Remote Substituent

scholarly journals Photochemical Transformation of some 3-benzyloxy-2-(benzo[b]thiophen-2-yl)-4Hchromen-4-ones: A Remote Substituent Effect

2018 ◽  
Vol 16 (1) ◽  
pp. 79-86
Author(s):  
Aarti Dalal ◽  
Radhika Khanna ◽  
Ramesh C. Kamboj
Keyword(s):  
Substituent Effect ◽  
Product Yield ◽  
Photochemical Transformation ◽  
Spectroscopic Techniques ◽  
Reaction Site ◽  
State Switching ◽  
Photochemical Transformations ◽  
Remote Substituent ◽  
Electron Donating Groups

AbstractThe effect on photochemical transformations of the substituents present remotely from the reaction site in 3-benzyloxy-2-(benzo[b]thiophen-2-yl)-4H-chromen-4-ones has been determined. The structure(s) of the substrates and photoproducts were established by spectroscopic techniques (UV, IR, and NMR). The substituents had profound effects on product yield and distribution. Electron withdrawing groups (EWGs) on the benzenoid moiety of the chromenone nucleus increased the yield of the photoproducts whereas electron donating groups (EDGs) decreased the yield. These results may be attributed to “state switching” of the substituents during excitation.

Conformational Studies by Dynamic NMR. 95.1Rotation around the Adamantyl−Alkyl Bond. Remote Substituent Effect on Conformational Equilibrium

2003 ◽  
Vol 68 (22) ◽  
pp. 8494-8499 ◽  
Author(s):  
J. Edgar Anderson ◽  
Armin de Meijere ◽  
Sergei I. Kozhushkov ◽  
Lodovico Lunazzi ◽  
Andrea Mazzanti
Keyword(s):  
Substituent Effect ◽  
Conformational Equilibrium ◽  
Dynamic Nmr ◽  
Conformational Studies ◽  
Remote Substituent

Remote substituent effect in palladium/pyridinyl-oxazolines catalyzed asymmetric allylic alkylation

2003 ◽  
Vol 193 (1-2) ◽  
pp. 89-95 ◽  
Author(s):  
Zhi-Peng Li ◽  
Fang-Yi Tang ◽  
Hua-Dong Xu ◽  
Xin-Yan Wu ◽  
Qi-Lin Zhou ◽  
...  
Keyword(s):  
Substituent Effect ◽  
Allylic Alkylation ◽  
Asymmetric Allylic Alkylation ◽  
Remote Substituent
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