Regioselective nitration of anilines with Fe(NO<sub>3</sub>)<sub>3</sub>·9H<sub>2</sub>O as a promoter and a nitro source
作者:Yang Gao、Yuanyou Mao、Biwei Zhang、Yingying Zhan、Yanping Huo
DOI:10.1039/c8ob00841h
日期:——
An efficient Fe(NO3)3·9H2O promoted ortho-nitration reaction of aniline derivatives has been developed. This reaction may go through a nitrogen dioxide radical (NO2˙) intermediate, which is generated by the thermal decomposition of iron(III) nitrate. The practicality of the present method using nontoxic and inexpensive iron reagents has been shown by the broad substrate scope and applications.
An efficient and one-pot synthetic method for the regioselective ortho-nitration of the N-phenyl carboxamides and primary anilines has been developed by using bismuth nitrate and aceticanhydride as the nitrating reagents. Reaction proceeds at room temperature and results in corresponding ortho-nitrated products in moderate to excellent yields. This method provides an operationally simple, regioselective
Substituent effects in solid-state assembly of activated benzotriazoles
作者:Daniel S. Wenholz、Mohan Bhadbhade、Hakan Kandemir、Junming Ho、Naresh Kumar、David StC. Black
DOI:10.1039/c8ce01757c
日期:——
donor–acceptor stacking from a non-mixed activated benzotriazole scaffold to give cofacial π-stacking in 2D sheets. We further report the effects of altering the substituents of the bicyclic aromatic system. It was found that any alteration made to the substituents disrupted the cofacial stacking, however, both aromatic donor–acceptor stacking and 2D sheet formation was observed in the solid-state assembly
The invention relates to compounds of formula (I), wherein R
1
, R
2
, R
1a
, R
2a
, R
3
, R
4
, A, B, X, W and n are as defined in the description, and pharmaceutically acceptable salts of such compounds. These compounds are useful as calcium channel blockers.