Synthesis of a biphenyl library for studies of hydrogen bonding in the solid state
摘要:
A biphenyl library incorporating amide and sulfonamide groups has been synthesised via microwave-mediated Suzuki-Miyaura couplings. Many derivatives were crystallised from dichloromethane/methanol and analysed by single crystal X-ray diffraction. An interesting structure was obtained for N-(4'-methylbiphenyl-4-yl)acetamide with Z'=6 and hydrogen-bonding networks of the type N-H center dot center dot center dot O in the unit cell. (C) 2012 Elsevier Ltd. All rights reserved.
杂环亚磺酸盐是钯催化与芳基和杂芳基卤化物偶联反应的有效试剂,通常可提供高产率的目标联芳基。然而,复杂杂环亚磺酸盐的制备和纯化可能存在问题。此外,亚磺酸盐官能团不能耐受大多数合成转化,使这些试剂不适合多步加工。在这里,我们表明杂环烯丙基砜可以作为潜在的亚磺酸盐试剂,并且当用 Pd(0) 催化剂和芳基卤化物处理时,会发生脱烯丙基化,然后进行有效的脱亚磺酰交叉偶联。使用多种互补路线可以方便地制备范围广泛的烯丙基杂芳基砜,并且证明是与各种芳基和杂芳基卤化物的有效偶联伙伴。我们证明烯丙基砜官能团可以耐受一系列标准合成转化,包括正交 C 和 N 偶联反应,允许多步加工。烯丙基砜成功地与多种医学相关底物偶联,证明了它们在要求严格的交叉偶联转化中的适用性。此外,药物克唑替尼和依托考昔是使用烯丙基杂芳基砜偶联伙伴制备的,进一步证明了这些新试剂的实用性。证明它们在要求苛刻的交叉耦合转换中的适用性。此外,药物克
6-O-Carbamoyl ketolide antibacterials of the formula:
1
wherein R
1
, R
2
, R
3
, R
4
, R
5
, R
6
, X, X′, Y, and Y′ are as described herein and in which the substituents have the meaning indicated in the description. These compounds are useful as antibacterial agents.
Nucleophilic Reaction upon Electron-Deficient Pyridone Derivatives. X.One-Pot Synthesis of 3-Nitropyridines by Ring Transformation of 1-Methyl-3,5-dinitro-2-pyridone with Ketones or Aldehydes in the Presence of Ammonia
作者:Yasuo Tohda、Miyuki Eiraku、Takao Nakagawa、Yumi Usami、Masahiro Ariga、Toshihide Kawashima、Keita Tani、Hiroko Watanabe、Yutaka Mori
DOI:10.1246/bcsj.63.2820
日期:1990.10
The reaction of 1-methyl-3,5-dinitro-2-pyridone (1a) with ketones or aldehydes in the presence of ammonia gave alkyl- and/or aryl-substituted 3-nitropyridines (6) in moderate to high yields. Enamines derived from the ketones gave better results than did the ketones themselves; on the other hand, those derived from the aldehydes gave no 6 at all. On the basis of deuterium-labeled experiments, a mechanism comprising competitive ring transformations of 1a is proposed.
Triarylbismuthanes as Threefold Aryl-Transfer Reagents in Regioselective Cross-Coupling Reactions with Bromopyridines and Quinolines
作者:Maddali L. N. Rao、Ritesh J. Dhanorkar
DOI:10.1002/ejoc.201402455
日期:2014.8
Cross-coupling studies using bromopyridines and bromoquinolines with triarylbismuths as threefold coupling reagents in substoichiometric amounts under Pd-catalysed conditions are disclosed. The reactivity was high with both mono- and dibromopyridyl substrates, and mono- and bis-couplings were carried out regioselectively. A library of monoaryl and diaryl pyridines was formed in high yields. A one-pot
The present invention provides agents effective to treat eye diseases, pharmaceutical compositions comprising them, methods for preparing pharmaceuticals for treatment of eye diseases comprising using the agents, use of the agents in manufacture of pharmaceuticals for treatment of eye diseases and methods for treating eye diseases comprising administering the agents or the pharmaceutical compositions. The eye diseases treated by the present invention include particularly glaucoma, especially normal tension glaucoma, or retinitis pigmentosa. The present invention provides the compound of formula (I)
wherein R is as defined in the description.
6-O-Carbamoyl ketolide antibacterials of the formula:
1
wherein R
1
, R
2
, R
3
, R
4
, R
5
, R
6
, X, X′, Y, and Y′ are as described herein and in which the substituents have the meaning indicated in the description. These compounds are useful as antibacterial agents.