TRANS-3,5-DISUBSTITUTEDPYRROLIDINE: ORGANOCATALYST FOR anti-MANNICH REACTIONS
申请人:Tanaka Fujie
公开号:US20070117986A1
公开(公告)日:2007-05-24
A compound of Formula I is disclosed, in which R is a substituent containing a hydrogen bond-forming atom within three atoms from the ring carbon to which the substituent is bonded; X is CH
2
, O, S or NR
1
, wherein R
1
is a hydrocarbyl group or an amino-protecting group having one to about 18 carbon atoms; R
2
is hydrido or a hydrocarbyl group containing one to about twelve carbon atoms; and R
3
is hydrido or methyl, but both R
2
and R
3
are not hydrido when X is CH
2
A molecule of Formula I and those in which R
2
and R
3
can both be hydrido (Formula X) functions as a catalyst in a Mannich reaction to asymmetrically form β-aminoaldehyde or β-aminoketone diastereomeric products having two chiral centers on adjacent carbon atoms and in which the anti-diastereomers are in excess over the syn-diastereomers. Methods for carrying out those syntheses are also disclosed.
Direct catalytic asymmetric anti-selective Mannich-type reactions
作者:Ismail Ibrahem、Armando Córdova
DOI:10.1039/b602221a
日期:——
The simple chiral pyrrolidine catalyzed asymmetric anti-selective Mannich-typereaction is presented; the reaction gives the corresponding amino acid derivatives with 10:1- >19:1 dr and 97-99% ee.
anti-Selective SMP-catalyzed direct asymmetric Mannich-type reactions: synthesis of functionalized amino acid derivatives
作者:Armando Córdova、Carlos F Barbas
DOI:10.1016/s0040-4039(02)01772-0
日期:2002.10
The first (S)-2-methoxymethylpyrrolidine (SMP)-catalyzed direct asymmetricMannich-type reactions of unmodified aldehydes with N-PMP-protected α-imino ethyl glyoxylate are described. The reaction proceeded in a highly anti-selective manner (dr up to 19:1) with enantioselectivities between 74 and 92%.
Asymmetric anti-Mannich reactions in continuous flow
作者:Rafael Martín-Rapún、Sonia Sayalero、Miquel A. Pericàs
DOI:10.1039/c3gc41444b
日期:——
A polystyrene-supported, pyrrolidine-based catalyst depicting very high activity and excellent stereoselectivity in the anti-Mannich reaction of aldehydes and ketones has been developed. The very robust, immobilized catalyst has been successfully used in the implementation of a continuous flow process with short residence times (down to 6 min) for the production of highly enantioenriched anti-type Mannich adducts at the preparative scale.
Enantioselective aerobic oxidative cross-dehydrogenative coupling of glycine derivatives with ketones and aldehydes <i>via</i> cooperative photoredox catalysis and organocatalysis
作者:Xiaorong Yang、Zhixiang Xie、Ying Li、Yuan Zhang
DOI:10.1039/d0sc00683a
日期:——
glycine derivatives and simple ketones or aldehydes, which provides an efficient approach for the rapid synthesis of enantiopure unnatural α-alkyl α-aminoacid derivatives in good yield with excellent diastereo- (up to >99 : 1) and enantioselectivities (up to 97% ee). This process includes the direct photoinduced oxidation of glycine derivatives to an imine intermediate, followed by the asymmetric Mannich-type