Palladium-catalyzed synthesis of substituted nitroolefins
摘要:
A one-pot protocol toward several substituted nitroolefins 4 and 6 starting with substituted acetones 2 and 5 was described. A facile process was carried out for the triflation of substituted acetones 2 and 5 with triflic anhydride (Tf2O) under the basic condition (Cs2CO3) and then palladium-catalyzed cross-coupling of enol triflates 3 with NaNO2 and BINAP in the presence of phase-transfer reagents (n-Bu4NBr) under the refluxing 1,2-dimethoxyethane (DME) in acceptable yields. (C) 2013 Elsevier Ltd. All rights reserved,
Copper-catalyzed coupling of aryl iodides and tert-butyl β-keto esters: efficient access to α-aryl ketones and α-arylacetic acid tert-butyl esters
作者:Duo Zhao、Yongwen Jiang、Dawei Ma
DOI:10.1016/j.tet.2013.10.017
日期:2014.5
catalyzed coupling of aryl iodides with tert-butyl β-ketoesters proceeded smoothly at 40 °C in DMF, providing α-aryl ketones after acid-promoted deprotection and decarboxylation of tert-butyl ester group. While CuI/2-picolinic acid catalyzed coupling of aryl iodides with tert-butyl acetoacetate at 70 °C in dioxane delivered α-arylacetic acid tert-butyl esters upon spontaneous deacylation. A wide range of
CuI /反-4-羟基-1-脯氨酸催化的芳基碘化物与叔丁基β-酮酯的偶联在DMF中在40°C下顺利进行,在酸促进叔丁酯的脱保护和脱羧反应后得到α-芳基酮团体。CuI / 2-吡啶甲酸在二恶烷中于70°C催化芳基碘化物与乙酰乙酸叔丁酯偶合时,在自发脱酰作用下释放出α-芳酸叔丁酯。各种各样的官能团,例如乙酰基,甲氧基,腈,硝基,溴和氯与反应条件相容。
NOVEL ANTIBACTERIAL AGENTS FOR THE TREATMENT OF GRAM POSITIVE INFECTIONS
申请人:MetCalf, III Chester A.
公开号:US20100184649A1
公开(公告)日:2010-07-22
The present invention relates to novel lipopeptide compounds, pharmaceutical compositions of these compounds and methods of using these compounds as antibacterial compounds. The compounds of the invention are particularly useful against a variety of bacteria, including resistant strains. The compounds are useful as antibacterial agents against
Clostridium difficile.
β-Keto Esters Derived from 2-(Trimethylsilyl)ethanol: An Orthogonal Protective Group for β-Keto Esters
作者:Reinhard Brückner、Eva Knobloch
DOI:10.1055/s-2008-1067157
日期:2008.7
esters derived from 2-(trimethylsilyl)ethanol undergo cleavage and decarboxylation when treated with 0.75 equivalents of tetrabutylammoniumfluoride trihydrate in tetrahydrofuran at 50 °C, while P-keto esters derived from methanol, tert-butylalcohol, allyl alcohol, or benzyl alcohol stay intact. Conversely, methyl-, tert-butyl-, allyl-, or benzyl P-keto esters can be cleaved and decarboxylated without
Synthesis of 6-Substituted 3-(Alkoxycarbonyl)-5-aryl-α-pyrones
作者:Masayuki Yamashita、Takuya Miura、Saki Fujioka、Naoto Takemura、Hiroki Iwasaki、Minoru Ozeki、Naoto Kojima
DOI:10.1055/s-0033-1338575
日期:——
the Claisen decarboxylation reaction. An efficient synthesis of 6-substituted 3-(alkoxycarbonyl)-5-aryl-α-pyrones is reported. This methodology consists of the successive manipulation of an addition–elimination reaction between benzyl ketone derivatives and dimethyl methoxymethylenemalonate, and an acid-catalyzed condensation reaction. The synthesis is applicable to various 5-p-substituted-aryl 6-substituted
This invention provides compounds of formula (I):
wherein R
1
, R
2
, G, m, n, p and q have values as described in the specification, useful as inhibitors of HDAC6. The invention also provides pharmaceutical compositions comprising the compounds of the invention and methods of using the compositions in the treatment of proliferative, inflammatory, infectious, neurological or cardiovascular diseases or disorders.