Studies on crown ether complexes—XXIX. synthesis and characterization of the complexes of lanthanide isothiocyanates with 13-crown-4
摘要:
The lanthanide isothiocyanate complexes with 13C4 have been prepared in ethyl acetate medium. These new complexes with the general formula [Ln(NCS)3(13C4)2H2O] (Ln = La, Pr-Tb, Er-Yb) have been characterized by elemental analysis, IR spectra, f-f hypersensitive transitions spectra, H-1 NMR spectra, conductivity measurements and TG-DTA techniques. In the complexes the ligand 13C4, isothiocyanate groups and water molecules are all coordinated to the metal ions.
OPTICALLY ACTIVE QUATERNARY AMMONIUM SALT HAVING AXIAL ASYMMETRY, AND METHOD FOR PRODUCING ALPHA-AMINO ACID AND DERIVATIVE THEREOF BY USING THE SAME
申请人:Maruoka Keiji
公开号:US20100029935A1
公开(公告)日:2010-02-04
The present invention discloses an optically active quarternary ammonium salt having axial asymmetry and a method for producing an α-amino acid and a derivative thereof using the same. The optically active quarternary ammonium salt having axial asymmetry of the present invention is a chiral phase-transfer catalyst that has a simple structure and that can be produced in a smaller number of process steps. The compound of the present invention is very useful as a phase-transfer catalyst in the synthesis of an α-alkyl-α-amino acid and a derivative thereof as well as an α,α-dialkyl-α-amino acid and a derivative thereof. Therefore, the compound of the present invention can be used in the development of novel foods and pharmaceuticals.
PROCESS FOR PRODUCTION OF MONO-SUBSTITUTED ALKYLATED COMPOUND USING ALDIMINE OR DERIVATIVE THEREOF
申请人:Maruoka Keiji
公开号:US20090054679A1
公开(公告)日:2009-02-26
The present invention provides a method for producing asymmetrical mono-substituted alkylated compounds of α-amino acids that are represented by a specific formula, using an aldimine-type Schiff base. In the method of the present invention, the process of alkylating an aldimine-type Schiff base in a medium in the presence of an optically-active quaternary ammonium salt phase-transfer catalyst and an inorganic base is initiated, and subsequently the reaction is quenched at a time earlier than a time for completion of the stoichiometric reaction of the alkylation reaction, so that a mono-substituted alkylated product with high optical purity can be obtained.
Studies On Rare-Earth Complexes with Crown Ethers. Part XXV. Synthesis, characterization, and structure of the complexes of lanthanide nitrates with 13-crown-4
The lanthanidenitratecomplexes with 13-crown-4(13-C-4) have been prepared in AcOEt. These new complexes with the general formula Ln(NO3)3.(13-c-4) (Ln = La–Nd, Sm–Lu) have been characterized by means of elemental analysis, IR and 1H-NMR spectra, conductivity measurements, and TG-DTA techniques. The crystal and molecular structure of Nd(No3)3. (13-c-4) has been determined by single crystal X-ray diffraction
OPTICALLY ACTIVE QUATERNARY AMMONIUM SALT HAVING AXIAL ASYMMETRY AND PROCESS FOR PRODUCING alpha-AMINO ACID AND DERIVATIVE THEREOF WITH THE SAME
申请人:Maruoka Keiji
公开号:US20070135654A1
公开(公告)日:2007-06-14
The present invention provides a compound of the following formula (I) below. This compound (I) can be produced by reacting a 2,2′-dimethylene bromide-1,1′-binaphthyl derivative, which can be produced by a relatively small number of processes, with an easily available secondary amine. This compound (I) is useful as a chiral phase-transfer catalyst.
Optically active quaternary ammonium salt having axial asymmetry and process for producing alpha-amino acid and derivative thereof with the same
申请人:Maruoka Keiji
公开号:US20070161624A1
公开(公告)日:2007-07-12
The present invention provides a compound of the following formula (I) below. This compound (I) can be produced by reacting a 2,2′-dimethylene bromide-1,1′-binaphthyl derivative, which can be produced by a relatively small number of processes, with an easily available secondary amine. This compound (I) is useful as a chiral phase-transfer catalyst.