Synthese von Moosinhaltsstoffen. 8. Sphagnums�ure und ihre Abbauprodukte
摘要:
For Sphagnum acid (1) and its enzymatic degradation product 5-hydrosy-4-(4-hydroxyphenyl)-5N-furan-2-on (2) efficient syntheses on preparative scale were developed, For the (4-hydroxyphenyl)butenolide 2 some characteristic chemical transformations are observed in acidic and basic medium.
Synthese von Moosinhaltsstoffen. 8. Sphagnums�ure und ihre Abbauprodukte
摘要:
For Sphagnum acid (1) and its enzymatic degradation product 5-hydrosy-4-(4-hydroxyphenyl)-5N-furan-2-on (2) efficient syntheses on preparative scale were developed, For the (4-hydroxyphenyl)butenolide 2 some characteristic chemical transformations are observed in acidic and basic medium.
The present invention provides compounds of formula (I*):
their use as H
3
inhibitors, processes for their preparation, and pharmaceutical compositions thereof.
Regioselective Entry to Bromo-γ-hydroxybutenolides: Useful Building Blocks for Assemblying Natural Product-Like Libraries
作者:M. Aquino、I. Bruno、R. Riccio、L. Gomez-Paloma
DOI:10.1021/ol0618611
日期:2006.10.1
[reaction: see text] We report a regioselective entry to 3-bromo- and 4-bromo-5-hydroxy-5H-furan-2-ones by photooxidation of 3-bromofuran with a singlet oxygen in the presence of a suitable base. By this procedure, a variety of 3-substituted gamma-hydroxybutenolides have become for the first time easily accessible. Strategies employing these highly functionalized building blocks for the preparation
functional molecules. In this study, a catalytic synthesis of halogenated γ-butenolides from cyclopropene carboxylic acids was developed using zwitterionic catalysts and N-haloamides as the halogen sources. The catalytic protocol could also be applied to the synthesis of halogenated pyrrolones by using cyclopropene amides as the starting materials.
The present invention is directed to novel pyridazinone derivatives that mediate enzymatic activity. In particular, the compounds may be effective in the treatment of diseases or disease states related to the activity of the histamine H3 receptor, including, for example, neurodegenerative disorders, sleep/wake disorders, attention deficit hyperactivity disorder and cognition/cognitive disorders.
The present invention is directed to novel pyridazinone derivatives that mediate enzymatic activity. In particular, the compounds may be effective in the treatment of diseases or disease states related to the activity of the histamine H3 receptor, including, for example, neurodegenerative disorders, sleep/wake disorders, attention deficit hyperactivity disorder and cognition disorders.