Chemistry of Substituted Quinolines: Thieno[2,3-b] and Thiopyrano[2,3-b]quinolines
摘要:
The reaction of 3-formyl-2-chloroquinolines with thioglycolic acid afforded a mixture of uncyclized [(3-formylquinolin-2-yl)thio]acetic acid in a 60-70% yield and cyclized thieno[2,3-b]quinoline-2-carboxylic acids in a 30-40% yield, respectively. The uncyclized compounds on refluxing with POCl3 in various alcoholic media gave [(3-formylquinolin-2-yl)thio]acetates. Further cyclization was achieved by refluxing them with dimethylformamide (DMF) to produce thieno[2,3-b]quinoline derivatives. On the other hand, the reaction of 3-formyl-2-mercaptoquinolines with chloroacetyl chloride in DMF gave 3-chloro-2H-thiopyrano[2,3-b]quinolin-2-ones. The structures of all the newly synthesized compounds were characterized on the basis of elemental analysis, IR, H-1 NMR, and mass spectral data.
An efficient, mild, and convenient method for the preparation of 2,3-dihydrothieno(2,3-b)quinolines and thieno(2,3-b)-quinolines via an unexpected domino aza-Morita–Baylis–Hillman/alkylation/aldol reaction has been developed. The plausible mechanisms for the unexpected reaction are also given.
SYNTHESIS OF THIENO(2,3-b)QUINOLINE-2-CARBOXYLIC ESTERS FROM 3-(2-OXO-1,2- DIHYDRO-3-QUINOLYL)ACRYLIC ESTERS
作者:V. Nithyadevi、S. Mohanapriya、S.P. Rajendran
DOI:10.1515/hc.2004.10.4-5.339
日期:2004.1
Bromination followed by dehydroxychlorination of 3-(2-oxo-l, 2-dihydro-3-quinolyl)acrylic methyl esters yielded the trihalo compound.These afforded thieno(2, 3-b)quinoline-2carboxylic methyl esters in good yields by boiling with thiourea in the protic solvent.
A Novel One-Step Synthesis of 2-Methoxycarbonylthieno[2,3-<i>b</i>]quinolines and 3-Hydroxy-2-methoxycarbonyl-2,3-dihydrothieno[2,3-<i>b</i>]-quinolines
作者:Balkrishen Bhat、Amiya Prasad Bhaduri
DOI:10.1055/s-1984-30929
日期:——
BHAT, BALKRISHEN;BHADURI, AMIYA, PRASAD, SYNTHESIS, BRD, 1984, N 8, 673-676