Carbonylation Chemistry Applied to the Synthesis of Benzimidazo[2,1‐
<i>b</i>
]quinazolin‐12‐ones
作者:Sarah Vangrunderbeeck、Tim Balcaen、Cedrick Veryser、Gert Steurs、Wim M. De Borggraeve
DOI:10.1002/ejoc.202101136
日期:2022.1.17
A new syntheticroute towards benzimidazo[2,1-b]quinazolin-12-ones has been developed, which relies on the Pd-catalyzed intramolecular aminocarbonylation of N-(2-bromophenyl)-1H-benzimidazol-2-amines. Using near stoichiometric amounts of 13CO, isotopicallylabelled benzimidazo[2,1-b]quinazolin-12-ones were synthesized.
开发了一种新的苯并咪唑[2,1- b ]喹唑啉-12-酮合成路线,该路线依赖于Pd催化的N- (2-溴苯基) -1H-苯并咪唑-2-胺的分子内氨基羰基化。使用接近化学计量的13 CO,合成了同位素标记的苯并咪唑并[2,1 - b ]喹唑啉-12-酮。
Divergent Approach for Regioselective Synthesis of Linearly and Angularly Fused Benzoimidazoquinazolinones from Isatoic Anhydrides
regioselective syntheses of a wide range of linearly and angularly fused benzoimidazoquinazolinones. The selectivity of the products relies on the generation of either highly electrophilic oxyphosphonium or less reactive imidate intermediates. A direct amine attack at the C-2 position of the oxyphosphonium intermediate presumably drives the reaction toward the linearly fused products, whereas an attack of
Microwave-Mediated Heterocyclization to Benzimidazo[2,1-<i>b</i>]quinazolin-12(5<i>H</i>)-ones
作者:Richard D. Carpenter、Kit S. Lam、Mark J. Kurth
DOI:10.1021/jo0618066
日期:2007.1.1
An effective route to benzimidazo[2,1-b]quinazolin-12(5H)-ones from commercially available o-aryl isothiocyanate esters and o-phenylenediamines is reported. This method accommodates a variety of substituents on either starting material and proceeds under microwave irradiation in the presence of barium hydroxide, conditions that do not hydrolyze methyl ester substituents. The pharmacologically pertinent benzimidazoquinazolinone heterocycle is delivered in excellent yield and purity via both solution- and solid-phase protocols, the latter involving traceless release from the resin.
BIRD, C. W.;KAPILI, M., TETRAHEDRON, 43,(1987) N 20, 4621-4624