Concise Preparation of a Stable Cyclic Sulfamidate Intermediate in the Synthesis of a Enantiopure Chiral Active Diamine Derivative
摘要:
A classical resolution was studied and developed from 2-benzoyl-pyridine in order to prepare SSR504734, a novel antipsychotic derivative. The key step of this route is the substitution of a sulfamidate derivative by a benzamide anion with complete inversion of configuration. The sulfamidate is prepared in a two-step procedure by reacting erythro phenyl-piperidine-2-yl-methanol derivative with thionyl chloride followed by oxidation with ruthenium oxide. This sulfamidate is an easily scalable intermediate that produce a diamine intermediate with the expected configuration.
möglichen diastereomeren 1,2‐Aminoalkohole ausgehend das jeweils gewünschte cis‐ oder trans‐Iminooxazolidin synthetisieren. DiealkalischeHydrolyse dieser Stoffe erfolgt ohne merkliche Racemisierung. Durch Anwendung der ”︁Carbamoyl‐Thionylchloridmethode„ und nachfolgende Hydrolyse läßt sich sein sterisch einheitlicher 1,2‐disubstituierter Aminoalkohol in seine entgegengesetzt konfigurierte Form überführen
非对映异构 1,2-二取代氨基乙醇立体定向环化为 4,5-二取代 2-亚氨基恶唑烷 a) 用卤化氰同时保持构型,b) 用“︁氨基甲酰亚硫酰氯法”和 Waldenscher 反演。通过结合这两个过程,一种可能的非对映异构 1,2-氨基醇可用于合成所需的顺式或反式亚氨基恶唑烷。这些物质的碱性水解发生时没有明显的外消旋化。通过应用“︁氨基甲酰亚硫酰氯法”和随后的水解,其空间均匀的1,2-二取代氨基醇可以转化为其相反构型的形式。
Construction of the Key Amino Alcohol Moiety of the Cinchona Alkaloids
作者:Yuichi Kobayashi、Yuuya Motoyama
DOI:10.1055/s-2006-950435
日期:2006.9
An N-Teoc [CO2(CH2)2TMS] protected form of the amino alcohol moiety found in the cinchona alkaloids was constructed by Curtius rearrangement followed by reaction of the isocyanate intermediate with TMS(CH2)2OH in one pot. Deprotection of the N-Teoc protective group and subsequent piperidine ring formation were easily accomplished with CsF in DMF at 110 °C in one pot to afford model compounds of the alkaloids.
Single electron transfer in the addition of chiral dipole-stabilized organolithiums to carbonyls. Stereochemistry of a chiral nucleophile as a mechanistic probe
作者:Kathleen S. Rein、Zhi-Hong Chen、P.T. Perumal、Luis Echegoyen、Robert E. Gawley
DOI:10.1016/0040-4039(91)85007-r
日期:1991.4
stereochemical evidence is provided which suggests that single electron transfer (SET) accounts for the difference in selectivity observed in the reaction of metalated pivalamides and oxazolines with carbonyls.