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).
Effective construction of quaternary stereocenters by highly enantioselective α-amination of branched aldehydes
作者:Ji-Ya Fu、Xiao-Ying Xu、Yan-Chun Li、Qing-Chun Huang、Li-Xin Wang
DOI:10.1039/c0ob00406e
日期:——
A highly efficient enantioselectiveα-amination of branchedaldehydes with azadicarboxylates promoted by chiral proline-derived amide thiourea bifunctional catalysts was developed for the first time, affording the adducts bearing quaternary stereogenic centers with excellent yields (up to 99%) and enantioselectivities (up to 97% ee).
A series of secondaryamine-thioureacatalysts 1a-1d derived from L-proline and chiral diamine were prepared and successfully applied to the Michael addition of acetone to trans-nitroalkenes in excellent yields (up to 99%) and enantioselectivities (44-91% ee).
[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).
A series of secondary amine–thiourea catalysts derived from l-proline and chiral diamine were prepared and successfully applied to the highly effective and enantioselectiveα-amination of unmodified aldehydes with various azodicarboxylates in excellent yields (up to 99%) and enantioselectivities (up to 99% ee) within a few minutes.