53898-99-0Relevant academic research and scientific papers
Synthetic studies of the pyrroloquinoline nucleus of the makaluvamine alkaloids. Synthesis of the topoisomerase II inhibitor makaluvamine D
White, James D.,Yager, Kraig M.,Yakura, Takayuki
, p. 1831 - 1838 (2007/10/02)
A new synthesis of the pyrrolo[4,3,2-de]quinoline system characteristic of a class of marine alkaloids which includes the prianosins, discorhabdins, and other antineoplastic agents has been developed. The approach is exemplified in a total synthesis of ma
Synthesis and Reactions of 2-Arylhydrazinotropones. II. Synthesis of 5-Aryltropolones and B-Ring-Open Colchicine Analogues via Benzidine Type Rearrangement of 2-(2-Arylhydrazino)tropones
Nozoe, Tetsuo,Takase, Kahei,Yasunami, Masafumi,Ando, Masayoshi,Saito, Hiroaki,et al.
, p. 128 - 142 (2007/10/02)
Treatment of a wide variety of 2-(2-arylhydrazino)tropones with ethanolic acid at 50-80 deg C readily gave the benzidine type rearrangement products, 2-amino-5-(4-aminoaryl)tropones, besides minor amounts of byproducts of various type.The main products were conveniently led to the corresponding 5-aryltropolones.Similarly, 2-(2-arylhydrazino)tropones bearing an isopropyl and isopropenyl group at the 4-position afforded 4-substituted 2-amino-5-(4-aminoaryl)tropones as the main products, which were also led to 4-substituted 5-(4-acetamidoaryl)- and 5-(4-methoxyaryl)tropolones.Structural assignments of these products were made on the basis of 1H NMR and other spectral data as well as of chemical transformations to known 5-phenyltropolone and also to 2-acetamido-8-hydroxy-10,10-dimethylcycloheptinden-7(10H)-one.This synthetic scheme may possibly be utilized for a convenient synthesis of B-ring-open analogues of colchicine.
