6216-63-3Relevant articles and documents
Synthesis of pyrrolizidines via Copper(I) catalyzed radical atom transfer cyclization
Seijas,Vazquez-Tato,Castedo,Estevez,Onega,Ruiz
, p. 1637 - 1642 (1992)
Trachelanthamidine and pseudoheliotridane are synthesized from (2S)-N-trichloroacetyl-2-vinylpyrrolidine (5) by a 5-exo-trig radical cyclization. The intermediate radical is generated heating 5 in a sealed tube (CH3CN/160°C) using CuCl as catal
Synthesis and absolute configuration of 2-(12'-aminotridecyl)-pyrrolidine, a defensive alkaloid from the Mexican bean beetle, Epilachna varivestis
Shi,Attygalle,Xu,Ahmad,Meinwald
, p. 6859 - 6868 (1996)
The synthesis of 2-(12'-aminotridecyl)-pyrrolidine (1), a defensive alkaloid recently isolated from the Mexican bean beetle, Epilachna varivestis, is described. The (2S,12'R) configuration is assigned to this alkaloid by comparing the 1H NMR spectrum of its (S)-MTPA derivative with that of (R)- and (S)-MTPA [α-methoxy-α-(trifluoromethyl)phenylacetyl] derivatives of the synthetic sample. These results suggest that the seventeen carbon skeleton of 1 is acetate rather than proline derived.
Efficient synthesis of methyl (S)-4-(1-methylpyrrolidin-2-YL)-3-oxobutanoate as the key intermediate for tropane alkaloid biosynthesis with optically acitve form
Katakam, Nanda Kumar,Seifert, Cole W.,D'Auria, John,Li, Guigen
, p. 604 - 613 (2019/08/01)
Methyl (S)-4-(1-methylpyrrolidin-2-yl)-3-oxobutanoate has been synthesized for enzymatic studies on cyclization enzymes during cocaine biosynthesis in Erythroxylum coca plants. During the present new synthesis, L-proline was first protected with Cbz group and reduced to chiral amino alcohol, which were then followed by Swern oxidation, Wittig reaction and decarboxylative condensation. At the last step, N-methylamino acid precursor was treated with 1,1'-carbonyldiimidazole followed by reacting with methyl potassium malonate to give the 3-oxobutanoate in 54% overall yield. This new strategy has proven to avoid obvious racemization of the L-proline chiral center during the synthesis. In addition, six of the eight synthesis steps were performed via GAP chemistry/technology without the use of column chromatography for purification.
Syntheses of chiral ferrocenophanes and their application to asymmetric catalysis
Zhang, Qiying,Cui, Xiuling,Chen, Lianmei,Liu, Haitao,Wu, Yangjie
, p. 7823 - 7829 (2015/01/16)
N-Substituted 2-aza-[3]-ferrocenophanes were easily synthesized from 1,1′-ferrocenedicarbaldehyde and aliphatic amines in high yields. One of the ferrocenophanes served as a ligand for the copper-catalyzed oxidative coupling of 2-naphthol derivatives to give the products in good yields with up to 92% ee, and it also efficiently catalyzed the asymmetric Michael addition reaction as an organocatalyst.