Two Approaches to the Aromatic Core of the Aminonaphthoquinone Antibiotics
作者:Christopher C. Nawrat、Leoni I. Palmer、Alexander J. Blake、Christopher J. Moody
DOI:10.1021/jo400737f
日期:2013.6.7
Two complementary approaches are presented for the synthesis of the quinone chromophores of the naphthoquinone ansamycins and related natural products. The first involves the use of an improved protocol for the manganese(III) acetate mediated cyclization of 5-aryl-1,3-dicarbonyl compounds to β-naphthols, leading to the simple, scalable preparation of building blocks suitable for the synthesis of naturally
Iron(III) Chloride Mediated
<i>para</i>
‐Selective C‐H Functionalization: Access to C5‐Chloro and C5,C7‐Dichloro/Dianisyl Substituted 2‐Arylbenzoxazoles
作者:Kanchanbala Sahoo、Niranjan Panda
DOI:10.1002/adsc.202101359
日期:2022.3
Iron(III) chloride mediated para-selective C−H chlorination and subsequent annulation of 2-amidophenol to synthesize C5- and C5, C7-chlorinated benzoxazoles was developed. Further, the oxidative cross-dehydrogenative coupling of amidophenol with anisole by ferricchloride was explored to achieve the remotely anisylated benzoxazoles.
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
Natural Abenquines and Their Synthetic Analogues Exert Algicidal Activity against Bloom-Forming Cyanobacteria
作者:Amalyn Nain-Perez、Luiz Cláudio Almeida Barbosa、Célia Regina Álvares Maltha、Giuseppe Forlani
DOI:10.1021/acs.jnatprod.6b00629
日期:2017.4.28
cyanobacterial growth in the 1 to 100 μM range. To further elucidate their biological significance, the synthesis of several analogues (4f–h, 5a–h) allowed us to identify some steric and electronic requirements for bioactivity. Replacing the acetyl by a benzoyl group in the quinone core and also changing the aminoacid moiety with ethylpyrimidinyl or ethylpyrrolidinyl groups resulted in analogues 25-fold more