Synthesis of some benzopyranoquinoline derivatives

Abstract

29-324-Chlorocoumarins on condensation with anthranilic acid afford 4-(2' -carboxyphenylamino )-<span style="font-size:13.5pt;mso-bidi-font-size:7.5pt;font-family:Arial;mso-bidi-font-style: italic">2H-(<span style="font-size:14.5pt;mso-bidi-font-size: 8.5pt">1)- benzopyran-2-ones 1 which on cyclisation with polyphosphoric acid yield 7,12-dihydro-6H-[1]benzopyrano[<span style="font-size:14.0pt;mso-bidi-font-size:8.0pt;font-family:Arial;mso-bidi-font-style: italic">4,3-b<span style="font-size:14.5pt;mso-bidi-font-size: 8.5pt">]quinoline-6,7-diones 2. Compounds 1 on treatment with phosphoryl chloride yield 7-chlorobenzopyrano[4,3-b]quinolin-6(H)-ones <b style="mso-bidi-font-weight: normal">3. These chloro compounds on further treatment with various aromatic amines yield 7-anilinobenzopyrano[4,3-<i style="mso-bidi-font-style: normal">b]quinolin-6(H)-ones 4.<span style="font-size:16.0pt; mso-bidi-font-size:10.0pt"> </span