3-Substituted Benzo[ e][1,2,4]triazines: Synthesis and Electronic Effects of the C(3) Substituent
PBN-AR
Instytucja
Centrum Badań Molekularnych i Makromolekularnych Polskiej Akademii Nauk
Informacje podstawowe
Główny język publikacji
EN
Czasopismo
JOURNAL OF ORGANIC CHEMISTRY
ISSN
0022-3263
EISSN
Wydawca
AMER CHEMICAL SOC
DOI
URL
Rok publikacji
2019
Numer zeszytu
10
Strony od-do
6377-6394
Numer tomu
84
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Język
EN
Treść
A series of 19 structurally diverse C(3)-substituted derivatives of benzo[e][1,2,4]triazine were synthesized from 3-chloro- (1c) and 3-iodobenzo[e][1,2,4]triazine (1d) obtained in three steps from 2-nitroaniline in 37-55% yields. Nucleophilic aromatic substitution and metal-catalyzed (Pd, Cu) reactions led to functional derivatives that include alkyl (C 5 H 11 ), (het)aryl (Ph, 2-thienyl, ferrocenyl), ArCC, amine (NHPh and morpholine), PO(OEt) 2 , sulfanyl (SBu-t), alkoxide (OEt, OMe), and CN. The synthesis of C(3)-CF 3 derivative 1g via the Ruppert reaction with 1d and its 1-oxide analogue 2d led to the substitution followed by formal addition of HCF 3 to the C?N bond. Pd-catalyzed carbonylation reactions of 1d and 2d did not give the corresponding C(3)-carboxylic acids. Therefore, acid 1f was obtained through hydrolysis of the CN. The substituent effect on the electronic structure of the benzo[e][1,2,4]triazine ring was investigated by spectroscopic methods (UV-vis and NMR) augmented with density functional theory calculations. Results show significant effect of the C(3) substituent on the (1) transition energy and good correlation of the 1 H NMR chemical shift with the substituent constant σ p . Molecular and crystal structures of six derivatives were established with the single-crystal X-ray diffraction method, and the substituent impact on the molecular geometry was investigated.
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PX-5ceba670d5de43daaaa69631
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