Promising core structure for nuclear receptor ligands: Design and synthesis of novel estrogen receptor ligands based on diphenylamine skeleton
摘要:
Novel diphenylamine-type estrogen receptor ligands were designed and synthesized, and their biological activities were evaluated by means of binding assays for estrogen receptor-alpha and -beta and cell proliferation assay using MCF-7 cells. Compounds 4f, 11b, 12c, and 8 showed moderate estrogenic activities. We propose that the diphenylamine skeleton may be a privileged structure for various nuclear receptor ligands, including RAR, RXR, and AR ligands. (C) 2008 Elsevier Ltd. All rights reserved.
Selective Monoarylation of Primary Amines Using the Pd-PEPPSI-IPent<sup>Cl</sup>Precatalyst
作者:Sepideh Sharif、Richard P. Rucker、Nalin Chandrasoma、David Mitchell、Michael J. Rodriguez、Robert D. J. Froese、Michael G. Organ
DOI:10.1002/anie.201502822
日期:2015.8.10
A single set of reaction conditions for the palladium‐catalyzed amination of a wide variety of (hetero)aryl halides using primaryalkyl amines has been developed. By combining the exceptionally high reactivity of the Pd‐PEPPSI‐IPentCl catalyst (PEPPSI=pyridine enhanced precatalyst preparation, stabilization, and initiation) with the soluble and nonaggressive sodium salt of BHT (BHT=2,6‐di‐tert‐butyl‐hydroxytoluene)
Efficient and Versatile Buchwald-Hartwig Amination of (Hetero)aryl Chlorides Using the Pd-PEPPSI-IPr<sup>(NMe2)2</sup>Precatalyst in the Presence of Carbonate Base
作者:Yin Zhang、Vincent César、Guy Lavigne
DOI:10.1002/ejoc.201500030
日期:2015.3
precatalyst Pd-PEPPSI-IPr(NMe2)2, in which the IPr ligand was modified by attachment of two dimethylamino groups on to the 4- and 5-positions of the imidazolyl heterocycle, was found to show high catalytic efficiency in the Buchwald-Hartwigamination under mild conditions using Cs2CO3 as a weak base, using a low catalyst loading of 1 mol-%. The protocol is applicable to arylchlorides bearing base-sensitive
Palladium-Catalysed Amination of Aryl- and Heteroaryl Halides Using<i>tert</i>-Butyl Tetraisopropylphosphorodiamidite as an Easily Accessible and Air-Stable Ligand
作者:Gheorghe-Doru Roiban、Gerlinde Mehler、Manfred T. Reetz
DOI:10.1002/ejoc.201301789
日期:2014.4
phosphorus compound tert-butyl tetraisopropylphosphorodiamidite, prepared from bis(diisopropylamino)chlorophosphine, is an excellent ligand for palladium-catalysed Buchwald–Hartwig amination of aryl- and heteroaryl chlorides and bromides. Based on its ready accessibility and air-stability, this amination protocol is a practical approach to the synthesis of industrially important aryl- and heteroarylamines.
Direct sp<sup>3</sup> C–H bond arylation, alkylation, and amidation of tetrahydroisoquinolines mediated by hypervalent iodine(<scp>iii</scp>) under mild conditions
作者:Wataru Muramatsu、Kimihiro Nakano、Chao-Jun Li
DOI:10.1039/c3ob42354a
日期:——
We have developed a method for the sp3C–Hbond functionalization of tetrahydroisoquinolines (THIQs) mediated by [bis(trifluoroacetoxy)iodo]benzene (PIFA). The treatment of the THIQs with various nucleophiles in the presence of PIFA in a green solvent alternative gave the coupled products, with a C–C, C–N, or quaternary carbon center in high yields.
B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>-Catalyzed Direct C3 Alkylation of Indoles and Oxindoles
作者:Shyam Basak、Ana Alvarez-Montoya、Laura Winfrey、Rebecca L. Melen、Louis C. Morrill、Alexander P. Pulis
DOI:10.1021/acscatal.0c01141
日期:2020.4.17
The direct C3 alkylation of indoles and oxindoles is a challenging transformation, and only a few direct methods exist. Utilizing the underexplored ability of triaryl boranes to mediate the heterolytic cleavage of α-nitrogen C–H bonds in amines, we have developed a catalytic approach for the direct C3 alkylation of a wide range of indoles and oxindoles using amine-based alkylating agents. We also employed