Iridium- and rhodium-catalyzed C–H activation and formyl arylation of benzaldehydes under chelation-assistance
作者:Xifa Yang、He Wang、Xukai Zhou、Xingwei Li
DOI:10.1039/c6ob00825a
日期:——
Mild and efficient synthesis of benzophenones via Ir(iii)- and Rh(iii)-catalyzed, directing group-assisted formyl C–H arylation of benzaldehydes has been achieved using diaryliodonium salts, in which Rh(iii) and Ir(iii) catalysts exhibited a complementary substrate scope.
Preparation of Benzoyloxy Benzophenone Derivatives and Their Inhibitory Effects of ICAM-1 Expression
作者:Eun-Mi Kwon、Cheol-Gi Kim、Ah-Ra Goh、Jin-Seu Park、Jong-Gab Jun
DOI:10.5012/bkcs.2012.33.6.1939
日期:2012.6.20
Benzoyloxy benzophenone derivatives were prepared in 3 steps including DCC coupling, Fries rearrangement and esterification from benzoic acids in 24-89% total yields. Among the prepared 12 benzophenone analogues 1a-1l, the compound 1b having three chloro groups at the para position showed maximum inhibitory effects of ICAM-1 expression but, 1a which have no substituents at all showed no inhibitory activity. This study provides the evidences that benzoyloxy benzophenone derivative, 1b may exert its anti-inflammatory activity by suppressing IFN-$\gamma}$-induced ICAM-1 expression.
Synthesis of<i>ortho</i>-Hydroxybenzophenones Catalyzed by Magnetically Retrievable Fe<sub>3</sub>O<sub>4</sub>Nanoparticles under Ligand-Free Conditions
作者:Thekkathu Ramani、Paspulati Umadevi、K. Leon Prasanth、Bojja Sreedhar
DOI:10.1002/ejoc.201300909
日期:2013.9
ortho-Benzoylation of phenols with aryl aldehydes to afford the substituted 2-hydroxybenzophenones can be catalyzed efficiently by Fe3O4 nanoparticles underligand-freeconditions. This method is useful for the preparation of xanthones in good yields. The catalyst can be magnetically removed and recycled easily over four cycles without a significant decrease in activity.
The first enantioselective chiral phosphoricacid-catalyzedtransferhydrogenation of N-aryl-ortho-hydroxybenzophenoneketimines using a Hantzsch ester as hydrogen source was developed to afford, after removal of the N-aryl group, the corresponding chiral diarylmethylamines in high yields and enantioselectivities.
Rhodium-Catalyzed Directing-Group-Assisted Aldehydic C-H Arylations with Aryl Halides
作者:Maddali L. N. Rao、Boddu S. Ramakrishna
DOI:10.1002/ejoc.201700881
日期:2017.9.15
A broad scope for the synthesis of 2′‐substituted benzophenones was established involving directing group (OH or NHTs) assisted C–H arylation of aryl aldehydes with arylhalides under rhodium‐catalyzed conditions.