Synthesis 2024; 56(13): 2100-2108
DOI: 10.1055/a-2323-0770
paper

Synthesis of Dibenzo[b,h][1,5]naphthyridin-7(12H)-ones: The Pictet–Spengler Reaction versus a Rearrangement of 4-Phenyl[1,3]oxazolo[4,5-c]quinolines

a   Department of Organic and Analytical Chemistry, Dostoevsky Omsk State University, Mira ave. 55A, Omsk 644077, Russian Federation
b   Laboratory of New Organic Materials, Omsk State Technical University, Mira Ave. 11, 644050 Omsk, Russian Federation
,
Sergey A. Kirnosov
a   Department of Organic and Analytical Chemistry, Dostoevsky Omsk State University, Mira ave. 55A, Omsk 644077, Russian Federation
,
Ekaterina S. Keyn
a   Department of Organic and Analytical Chemistry, Dostoevsky Omsk State University, Mira ave. 55A, Omsk 644077, Russian Federation
,
a   Department of Organic and Analytical Chemistry, Dostoevsky Omsk State University, Mira ave. 55A, Omsk 644077, Russian Federation
b   Laboratory of New Organic Materials, Omsk State Technical University, Mira Ave. 11, 644050 Omsk, Russian Federation
,
Anastasia S. Kostyuchenko
b   Laboratory of New Organic Materials, Omsk State Technical University, Mira Ave. 11, 644050 Omsk, Russian Federation
,
a   Department of Organic and Analytical Chemistry, Dostoevsky Omsk State University, Mira ave. 55A, Omsk 644077, Russian Federation
b   Laboratory of New Organic Materials, Omsk State Technical University, Mira Ave. 11, 644050 Omsk, Russian Federation
› Author Affiliations
This work was supported by the Russian Science Foundation (Grant No. 23-73-01151).


Abstract

Two approaches were proposed for the synthesis of dibenzo[b,h][1,5]naphthyridin-7(12H)-ones. The one-step method based on the Pictet–Spengler reaction of 3-amino-2-phenylquinolin-4(1H)-one with aromatic aldehydes requires heating in a strong acidic media, which leads to significant limitations on the possible products. The second approach is based on the conversion of 3-amino-2-phenylquinolin-4(1H)-one to 4-phenyl[1,3]oxazolo[4,5-c]quinolines followed by rearrangement under the action of AlCl3. A significant advantage of the two-step synthesis is the possibility of obtaining a wider range of dibenzo[b,h][1,5]naphthyridin-7(12H)-ones, including those not available using the Pictet–Spengler reaction.

Supporting Information



Publication History

Received: 01 April 2024

Accepted after revision: 10 May 2024

Accepted Manuscript online:
10 May 2024

Article published online:
28 May 2024

© 2024. Thieme. All rights reserved

Georg Thieme Verlag KG
Rüdigerstraße 14, 70469 Stuttgart, Germany