Highly enantioselective carbonyl reduction with borane catalyzed by chiral spiroborate esters derived from chiral beta-aminoalcohols
申请人:Ortiz-Marciales Margarita
公开号:US20080200672A1
公开(公告)日:2008-08-21
Novel spiroborate esters derived from non-recemic 1,2-amino alcohols were examined as chiral catalyst in the borane reduction of acetophenone and other aromatic ketones at room temperature. The optically active alcohols were obtained in excellent chemical yields and up to 99% ee with less than 10% catalyst.
Chiral Discrimination by a Binuclear Pd Complex Sensor Using <sup>31</sup>P{<sup>1</sup>H} NMR
作者:Zhongxiang Chen、Mingxue Yang、Zhaofeng Sun、Xuebo Zhang、Jing Xu、Guangling Bian、Ling Song
DOI:10.1021/acs.analchem.9b03661
日期:2019.11.19
An axially chiral binuclear μ-hydroxo Pd complex (BPHP) first served as an excellent chiral sensor for discriminating a variety of analytes including amino alcohol, amino amide, amino acid, mandelicacid, diol, diamine, and monoamine by 31P1H} NMR. A detailed recognition mechanism was proposed based on the single crystal and mass spectrum of Pd-complexes. In general, BPHP sensor, through extracting
轴向手性双核μ-羟基Pd络合物(BPHP)首先是出色的手性传感器,可通过31 P 1 H来区分各种分析物,包括氨基醇,氨基酰胺,氨基酸,扁桃酸,二醇,二胺和单胺NMR。基于单晶和钯络合物的质谱,提出了一种详细的识别机理。通常,BPHP传感器通过其Pd-OH基团提取分析物的酸性氢,与分析物的两个对映异构体形成稳定的非对映异构体复合物,从而为手性鉴别提供了可分辨的31 P 1 H} NMR分离信号。
NOVEL PROCESS FOR PREPARING PHENYLCYCLOPROPYLAMINE DERIVATIVES USING NOVEL INTERMEDIATES
申请人:Khile Anil Shahaji
公开号:US20130150577A1
公开(公告)日:2013-06-13
Provided herein is a novel process for the preparation of phenylcyclopropylamine derivatives, which are useful intermediates in the preparation of triazolo[4,5-d]pyrimidine compounds. Provided particularly herein is a novel, commercially viable and industrially advantageous process for the preparation of a substantially pure ticagrelor intermediate, trans-(1R,2S)-2-(3,4-difluorophenyl)-cyclopropylamine. The intermediate is useful for preparing ticagrelor, or a pharmaceutically acceptable salt thereof, in high yield and purity.
Synthesis of Highly Stereodefined Tetrasubstituted Acyclic All-Carbon Olefins via a <i>Syn</i>-Elimination Approach
作者:Ngiap-Kie Lim、Patrick Weiss、Beryl X. Li、Christina H. McCulley、Stephanie R. Hare、Bronwyn L. Bensema、Teresa A. Palazzo、Dean J. Tantillo、Haiming Zhang、Francis Gosselin
DOI:10.1021/acs.orglett.7b03141
日期:2017.11.17
An efficient synthesis of stereodefined tetrasubstituted acyclic all-carbon olefins has been developed via a bis(2,6-xylyl)phosphate formation of stereoenriched tertiary alcohols, followed by in situ syn-elimination of the corresponding phosphates under mild conditions. This chemistry tolerates a wide variety of electronically and sterically diverse substrates and generates the desired tetrasubstituted
There is disclosed a process for producing an optically active hemiester of formula (1):
1
wherein R
1
, R
2
and R
5
represent the same meanings as described below, which comprises reacting a cyclic acid anhydride of formula (2):
2
wherein R
1
and R
2
are different and independently represent
a hydrogen atom, a halogen atom,
an alkyl group optionally substituted with an alkoxy group or a halogen atom, and the like, with a hydroxy compound of formula (3):
R
3
OH (3)
wherein R
3
represents
an alkyl group optionally substituted with an alkoxy group, a phenoxy group, a dialkylamino group or a halogen atom and the like, in the presence of an asymmetric catalyst.