Synthesis of Amino-1,4-benzoquinones and Their Use in Diels–Alder Approaches to the Aminonaphthoquinone Antibiotics
作者:Christopher C. Nawrat、William Lewis、Christopher J. Moody
DOI:10.1021/jo201320g
日期:2011.10.7
A new protocol for the synthesis of protected amino-1,4-benzoquinones by oxidation of the corresponding 2,5-dimethoxyaniline derivatives using PhI(OAc)2 or PhI(OCOCF3)2 in water containing 2.5% methanol is reported. The process represents an improvement over previously reported methods, both in terms of yield and number of steps, and in the range of nitrogen protecting groups that it tolerates. A number
para-selective C−Htrifluoromethylation of a class of arenes has not been achieved. In this study, we report a light-promoted 4,5-dichlorofluorescein (DCFS)-enabled para-selective C−Htrifluoromethylation of arylcarbamates using Langlois reagent. The preliminary mechanistic study revealed that the activated organic photocatalyst coordinated with the arylcarbamate led to para-selective C−H trifluoromethylation
2,4-Diaminopyrido[3,2-d]pyrimidine Inhibitors of Dihydrofolate Reductase from Pneumocystis carinii and Toxoplasma gondii
作者:Andre Rosowsky、Ronald A. Forsch、Sherry F. Queener
DOI:10.1021/jm00014a014
日期:1995.7
Six previously unknown 2,4-diamino-6-(anilinomethyl)- and 2,4-diamino-6-[(N-methylanilino)-methyl]pyrido[3,2-d]pyrimidines (5-10) were synthesized from 2,4-diamino-6-(bromomethyl)-pyrido[3,2-d]pyrimidine hydrobromide (11.HBr) by treatment with the appropriate aniline or N-methylaniline in dimethylformamide at room temperature, with or without NaHCO3 present. Compounds 5-10 were tested as inhibitors
The synthesis of novel analogues of the manumycin family of antibiotics and the antitumour antibiotic LL-C10037α
作者:Isabelle Kapfer、Norman J. Lewis、Gregor Macdonald、Richard J.K. Taylor
DOI:10.1016/0040-4039(96)00203-1
日期:1996.3
Efficient approaches to the central amino-epoxycyclohexenone core of the manumycin family of antibiotics are described. The use of this methodology to prepare the antitumourantibiotic LL-C10037α and its epimer, both in racemic form, and a number of analogues of manumycin, alisamycin and asukamycin, lacking the C-4 substituent, are then outlined.