PROCESSES FOR THE PREPARATION OF PYRROLIDINE INTERMEDIATES
申请人:SYNGENTA PARTICIPATIONS AG
公开号:US20140296527A1
公开(公告)日:2014-10-02
The present invention relates to processes for the enantio-selective preparation of spyrrolidine derivatives useful in the manufacture of pesticidally active compounds, as well as to intermediates in the processes. The processes include those comprising
(a-i) reacting a compound of formula Ia
wherein
P is alkyl, aryl or heteroaryl, each optionally substituted, wherein the heteroaryl is connected at P via a ring carbon atom;
R
1
is chlorodifluoromethyl or trifluoromethyl;
R
2
is aryl or heteroaryl, each optionally substituted;
with a source of cyanide in the presence a chiral catalyst to give a compound of formula IIa
wherein P, R
1
and R
2
are as defined for the compound of formula Ia; and
(a-ii) oxidising the compound of formula IIa with a peroxy acid, or peroxide in the presence of an acid to give a compound of formula VI
wherein R
1
and R
2
are as defined for the compound of formula Ia.
Synthesis of Ni(II) complexes with chiral derivatives of cyclohexane-1,2-diamine, bycyclo[2.2.2]octane-2,3-diamine, and 1,2-diphenylethane-1,2-diamine
作者:A. E. Sibiryakova、A. N. Reznikov、V. B. Rybakov、Yu. N. Klimochkin
DOI:10.1134/s107036321611013x
日期:2016.11
Chiral ligands-derivatives of (1R,2R)-cyclohexane-1,2-diamine, (1R,2R)-diphenylethane-1,2-diamine, and (2S,3S)-bicyclo[2.2.2]octane-2,3-diamine-and octahedral Ni(II) complexes on their basis have been synthesized.
US9469633B2
申请人:——
公开号:US9469633B2
公开(公告)日:2016-10-18
Organocatalytic asymmetric aldol reaction using protonated chiral 1,2-diamines
作者:Jae Ho Shim、Min-Joon Kim、Ji Yeon Lee、Kyoung Hoon Kim、Deok-Chan Ha
DOI:10.1016/j.tetlet.2020.152295
日期:2020.9
Organic-catalyzed stereoselective reactions have gained attention because they avoid the problems associated with metal catalysts, but existing catalysts based on proline have limitations. Therefore, (R,R)-(+)-1,2-diphenylethylenediamine (DPEN) was selectively mono-N-alkylated through reductive alkylation and used as an organic catalyst for the aldol reaction. Using a variety of aldehydes in the catalytic
Nitroalkenes in the Ni(II) Catalyzed Asymmetric<i>Michael</i>Addition. Convenient Route to the Key Intermediate of Brivaracetam
作者:Alexander N. Reznikov、Leonid E. Kapranov、Valentina V. Ivankina、Anastasiya E. Sibiryakova、Victor B. Rybakov、Yuri N. Klimochkin
DOI:10.1002/hlca.201800170
日期:2018.12
A series of Ni(II) complexes with novel chiral ligands derived from (1R,2R)‐1,2‐diphenylethane‐1,2‐diamine was synthesized. The catalytic activity of these complexes in the asymmetricMichael reaction is demonstrated. Asymmetricaddition of diethyl malonate to ω‐nitrostyrene and 1‐nitropent‐1‐ene in the presence of these complexes leads to the enantiomerically enriched diethyl (S)‐2‐(2‐nitro‐1‐phenylethyl)malonate