Synthesis of novel 5a,10,14b,15-tetraaza-benzo[a]indeno[1,2-c]anthracen-5-one and benzimidazo[1,2-c]quinazoline derivatives under microwave irradiation

Review of Microwave-Assisted Synthesis of Benzo-Fused Six-MemberedN,N-Heterocycles

“…However, microwave irradiation of anthranilic acids with benzimidazoquinazoline on carbon graphite as support led to the formation of compounds 5a,10,14b,15-tetraazabenzo[a]indeno[1,2-c]anthracen-5-ones in good yields and in shorter times than for the purely thermal procedures (Scheme 18). [72] The preparation of novel tetraazabenzo . [72][73] The indolo [1,2-c] heating allowed a small amount of the products (yields <35%).…”

“…[72] The preparation of novel tetraazabenzo . [72][73] The indolo [1,2-c] heating allowed a small amount of the products (yields <35%). [74] An effective route to the formation of benzimidazo[2,1-b]quinazolin-12(5H)-ones from o-aryl isothiocyanate esters and o-phenylenediamines has been reported by Carpenter et al.…”

Heterocyclic Chemistry Using Microwave‐Assisted Approaches

“…However, the procedure with solvents would offer the possibility of investigating the microwave-assisted solid-phase synthesis of these quinazolinones, which would faciltate purification of the final products. Developing their work on the use of microwave-assisted Niementowski reactions, the same group published the synthesis of novel triaza-and tetraaza-benzo[a]-indeno [1,2-c ]anthracen-5ones by the condensation of anthranilic acid with 2-(2-aminophenyl)indole or benzimidazole (Scheme 3.49) 78,79 .…”

Heptacoordinated diphenyllead; hexa- and pentacoordinated triphenyllead and tin compounds derived from 5H-benzimidazo[1,2-c]quinazoline-6-thione

“…In spite of numerous and diverse syntheses of 1 [1,2,4,[12][13][14][15][16][17][18], and that it is a starting material for biologically active compounds and pharmaceuticals [12,13], neither its X-ray diffraction structure nor its 13 C NMR spectrum have been reported. This information is important in order to establish its preferred tautomer and possible metallic coordination modes.…”

“…This information is important in order to establish its preferred tautomer and possible metallic coordination modes. It has been proposed that compound 1 is a thiol [1,17].…”