Synthesis of Enantiomerically Enriched α-Bromonitriles from Amino Acids
摘要:
Two methods were investigated for the preparation of six chiral alpha-bromonitriles with different optic purities. The nitrous deamination of amino acids gives alpha-bromoacids, which react with chlorosulfonyl isocyanate followed by triethylamine to afford alpha-bromonitriles with moderate enantiomeric excess. However, the dehydration of corresponding alpha-bromoamids using thionyl chloride gives alpha-bromonitriles with good enantiomeric excess up to 94%. The use of phosphoryl chloride instead of thionyl chloride results in more than 30% racemization as determined by high-performance liquid chromatograpic analysis.
New Chiral Aminoamidoximes: Syntheses and Investigation of Heterocyclic Compounds
作者:Najeh Tka、Béchir Ben Hassine
DOI:10.1080/00397911.2010.531441
日期:2012.3.15
Abstract New chiral aminoamidoximes were prepared from (L)-proline, (L)-alanine, and (L)-isoleucine by treatment of the corresponding aminonitriles with hydroxylamine in the presence of triethylamine. The intramolecular cyclization with α-bromoacid chlorides and aldehydes was investigated to give new 1,2,4-oxadiazin-6-ones and 1,2,4-oxadiazoles, respectively. These compounds were likely to undergo
Provision of a superior URAT1 activity inhibitor effective for the treatment and the like of a pathology involving uric acid, such as hyperuricemia, gouty tophus, acute gouty arthritis, chronic gouty arthritis, gouty kidney, urinary lithiasis, renal dysfunction, coronary heart disease, ischemic cardiac diseases and the like.
A URAT1 activity inhibitor containing a compound represented by the following formula [1] or a pharmaceutically acceptable salt thereof, or a solvate thereof as an active ingredient:
wherein each symbol is as defined in the specification.
This invention relates to the compounds of formula (I) shown below. Each variable in formula (I) is defined in the specification. These compounds can be used to treat a kinesin Eg5 protein-mediated disorder.
The accurate determination of the enantiomeric composition of α-halo carboxylic acids is reported. Such data are of importance in the synthesis of chiral compounds and in mechanistic studies involving the title compounds.
Darstellung und Eigenschaften der optisch aktiven Bromisovale
作者:H. Auterhoff、W. Lang
DOI:10.1002/ardp.19703030108
日期:——
Es wurden aus razemischer α‐Bromisovaleriansäure die D‐ und L‐Isomere dargestellt und über die optisch aktiven Chloride mit Harnstoff D‐ und L‐Bromisoval synthetisiert. Die krampfunterdrückende Wirkung an der Maus nach Gabe von Pentetrazol war beim L‐Bromisoval etwa 3mal größer als beim D‐Bromisoval.
D 和 L 异构体由外消旋 α-溴异戊酸制备,并通过具有尿素 D 和 L-溴异价的旋光氯化物合成。给予五四唑后,L-溴异戊二醛对小鼠的抗惊厥作用比 D-溴异戊二醛高约三倍。