PROCESS FOR THE PREPARATION OF DIHYDROPYRROLE DERIVATIVES
申请人:Syngenta Participations AG
公开号:US20160073631A1
公开(公告)日:2016-03-17
The present invention provides stereoselective processes for the preparation of compounds of formula (I)
wherein
P is phenyl, naphthyl, a 6-membered heteroaryl group containing one or two nitrogen atoms as ring members, or a 10-membered bicyclic heteroaryl group containing one or two nitrogen atoms as ring members, and wherein the phenyl, naphthyl and heteroaryl groups are optionally substituted;
R
1
is chlorodifluoromethyl or trifluoromethyl;
R
2
is optionally substituted aryl or optionally substituted heteroaryl;
n is 0 or 1;
including the process comprising
(a-i) reacting a compound of formula II
wherein P, R
1
and R
2
are as defined for the compound of formula I;
with nitromethane in the presence a chiral catalyst to give a compound of formula III
wherein P, R
1
and R
2
are as defined for the compound of formula I; and
(a-ii) reductively cyclising the compound of formula III to give the compound of formula I.
The invention also provides intermediates useful for processes for the synthesis of compounds of formula (I).
A (S)-pyrrolidine sulfonamidecatalyzed asymmetric direct aldol reaction of aryl methyl ketones with aromatic aldehydes has been developed with moderate to good enantioselectivities. The study considerably broadens the substrate scope of chiral amines promoted aldol processes.
[EN] PROCESS FOR THE PREPARATION OF DIHYDROPYRROLE DERIVATIVES<br/>[FR] PROCÉDÉ POUR LA PRÉPARATION DE DÉRIVÉS DE DIHYDROPYRROLE
申请人:SYNGENTA PARTICIPATIONS AG
公开号:WO2011154555A1
公开(公告)日:2011-12-15
The present invention provides stereoselective processes for the preparation of compounds of formula (I) wherein P is phenyl, naphthyl, a 6-membered heteroaryl group containing one or two nitrogen atoms as ring members, or a 10-membered bicyclic heteroaryl group containing one or two nitrogen atoms as ring members, and wherein the phenyl, naphthyl and heteroaryl groups are optionally substituted; R1 is chlorodifluoromethyl or trifluoromethyl; R2 is optionally substituted aryl or optionally substituted heteroaryl; n is 0 or 1; including the process comprising (a-i) reacting a compound of formula II wherein P, R1 and R2 are as defined for the compound of formula I; with nitromethane in the presence a chiral catalyst to give a compound of formula III Wherein P, R1 and R2 are as defined for the compound of formula I; and (a-ii) reductively cyclising the compound of formula III to give the compound of formula I. The invention also provides intermediates useful for processes for the synthesis of compounds of formula (I).
Dynamic Covalent Organocatalysts Discovered from Catalytic Systems through Rapid Deconvolution Screening
作者:Fredrik Schaufelberger、Olof Ramström
DOI:10.1002/chem.201502088
日期:2015.9.1
The first example of a bifunctional organocatalyst assembled throughdynamiccovalent chemistry (DCC) is described. The catalyst is based on reversible imine chemistry and can catalyze the Morita–Baylis–Hillman (MBH) reaction of enones with aldehydes or N‐tosyl imines. Furthermore, these dynamic catalysts were shown to be optimizable through a systemic screening approach, in which large mixtures of