Premium
Simple and Efficient Synthesis of Novel 3‐Substituted 2‐Thioxo‐2,3‐dihydro‐1 H ‐benzo[ g ]quinazolin‐4‐ones and Their Reactions with Alkyl Halides and α‐Glycopyranosyl Bromides
Author(s) -
Khodair Ahmed I.,
Elsafi Mona A.,
AlIssa Siham A.
Publication year - 2019
Publication title -
journal of heterocyclic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.321
H-Index - 59
eISSN - 1943-5193
pISSN - 0022-152X
DOI - 10.1002/jhet.3623
Subject(s) - chemistry , heteronuclear molecule , alkylation , alkyl , glycosylation , nucleoside , stereochemistry , proton nmr , medicinal chemistry , homonuclear molecule , halide , nuclear magnetic resonance spectroscopy , molecule , organic chemistry , catalysis , biochemistry
A series of 3‐substituted 2‐thioxo‐2,3‐dihydro‐1 H ‐benzo[ g ]quinazolin‐4‐ones 4a – e were synthesized from the reaction of 3‐aminonaphthalene‐2‐carboxylic acid 1 with isothiocyanate derivatives 2a – e . The alkylation of 4a – e with alkyl halides gave 3‐substituted 2‐alkylsulfanyl‐2,3‐dihydro‐1 H ‐benzo[ g ]quinazolin‐4‐ones 5a – o . S ‐Glycosylation was carried out via the reaction of 4a – e with glycopyranosyl bromides 7a and 7b under anhydrous alkaline conditions. The structure of the compounds was established as S ‐nucleoside and not N ‐nucleoside. Conformational analysis has been studied by homonuclear and heteronuclear two‐dimensional NMR methods (2D DFQ‐COSY, heteronuclear multiple quantum coherence, and heteronuclear multiple bond correlation). The S site of alkylation and glycosylation was determined from the 1 H and 13 C heteronuclear multiple quantum coherence experiments.