A convenient synthesis of (S)-2-Azidonitriles, (S)-2-aminonitriles and (S)-1,2-diamines
摘要:
(S)-2-Azidonitriles (S)-4 are easily accessible from (R)-2-(sulfonyloxy)nitriles (R)-2 by nucleophilic substitution with alkali azides 3 under complete inversion of configuration. The azidonitriles (S)-4 can be converted by catalytic hydrogenation into (S)-2-aminonitriles (S)-8 and by hydrogenation using LiAlH4 into (S)-1, 2-diaminoalkanes (S)-9, respectively, both, (S)-8 and (S)-9, isolated as hydrochlorides. Hydrolysis of the aminonitrile hydrochlorides (S)-8 HCl in a saturated solution of HC1 in alcohol gives (S)-2-amino carboxamide hydrochlorides(S)-10 . HCl with enantiomeric excesses >99% after recrystallization.
The invention relates to a compound of formula (I)
wherein R
1
to R
4
are defined as in the description and in the claims. The compound of formula (I) can be used as a medicament.
using hypervalent iodine reagent. A new m-CPBA mediated geminal aminooxygenation is also reported. A novel reagent-switch for the control of migrating group by controlling the two independent geminal addition paths is developed. Deuteriumlabelling studies and the control studies have provided unambiguous evidences for the phenyl migration and hydride migration in the oxidative geminal difunctionalization
<i>cis</i>–<i>trans</i>Isomerism among the Octahedral Diaquabis(optically active<i>C</i>-substituted ethylenediamine)nickel(II) Complexes and Their Thermal Reaction Products. An Explanation for a Variety in Colors and Stereochemistry of Lifschitz Complexes
trans-diaquabis(diamine)nickel(II) complexes (trans-[Ni(diamine)2(H2O)2]X2) were investigated by means of TG/DTA and DSC, and high-temperature electronic spectrometry, where the diamine is an opticallyactivediamine such as (1S,2S)-1,2-diphenyl-1,2-ethanediamine or (S)-4-methyl-1,2-pentanediamine, and X is Cl−, Br−, or NO3−. Several complexes were peculiarly transformed into cis-[NiX2(diamine)2] upon thermal
用TG/DTA和DSC研究了反式双(二胺)镍(II)配合物(反式-[Ni(二胺)2(H2O)2]X2)的固相热反应,以及高温电子学光谱法,其中二胺是光学活性二胺,例如 (1S,2S)-1,2-二苯基-1,2-乙二胺或 (S)-4-甲基-1,2-戊二胺,并且 X 是 Cl-, Br-,或NO3-。几种配合物在热脱水-氨基化时特殊地转化为顺式-[NiX2(二胺)2],然后在进一步加热时异构化为反式-[NiX2(二胺)2]。结果与配合物与相应的外消旋二胺的反应相反,后者经历了简单的脱水-阴离子化,保留了原始的反式构型。
Bianthryl-based organocatalysts for the asymmetric Henry reaction of fluoroketones
作者:Jan Otevrel、David Svestka、Pavel Bobal
DOI:10.1039/c9ob00884e
日期:——
catalytic system based on bianthrylbis(thiourea) for the asymmetric Henry reaction of fluoroketones and nitroalkanes that resulted from the screening of a library containing 31 chiral non-racemic organocatalysts. The corresponding adducts were isolated in up to 6 times shorter reaction time in comparison with the previously published organocatalysts. High levels of stereocontrol have been generally observed
Die Konfiguration der optisch aktiven Propylendiamine, 2-Methyl-4,5-diaminopentane und ?-Pyrrolidyl-methylamine
作者:S. Schnell、P. Karrer
DOI:10.1002/hlca.19550380745
日期:——
Durch Reduktion der Amide von L-Alanin, L-Leucin und L-Prolin mit LiAlH4 wurden L-Propylendiamin, L-2-Methyl-4, 5-diaminopentan und L-α-Pyrrolidyl-methylamin dargestellt.
第三人以Reduktion DER酰胺·冯·L-丙氨酸,L-亮氨酸UND L-脯氨酸MIT的LiAlH 4 wurden L-Propylendiamin,L-2-甲基-4,5- diaminopentan UND L-α-吡咯烷基-methylamin dargestellt。