2717-76-2Relevant academic research and scientific papers
Method for preparing pharmaceutical intermediate of tryptophan derivative
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, (2021/09/21)
The synthesis method comprises the following steps: L - tryptophan derivatives are taken as starting materials, and esterification is carried out in sequence. The amidation, Boc protection, hydrolysis, amidation or sequential esterification, amidation, Boc protection, hydrogenation, hydrolysis, amidation yields a target product, a tryptophan derivative pharmaceutical intermediate. The preparation method has the advantages of cheap and easily available raw materials, environment friendliness, less process three wastes, accords with the idea of green pharmacy, mild reaction conditions, simple process, simple and convenient operation, high yield and purity and easy amplification and production.
An efficient, stereocontrolled and versatile synthetic route to bicyclic partially saturated privileged scaffolds
Bond, Andrew D.,Hanby, Abigail R.,King, Thomas A.,Moss, Thomas A.,Sore, Hannah F.,Spring, David R.,Stewart, Hannah L.
supporting information, p. 6818 - 6821 (2020/07/04)
Herein, we describe the development of a simple, high yielding and stereocontrolled strategy for the synthesis of a series of triazolopiperazines and other biologically relevant fused scaffolds from optically active amino acids. This route was applied to the synthesis of 22 scaffolds containing new, previously inaccessible vectors and used to access a novel analogue of ganaplacide.
Synthesis of tryptophans by Lewis acid promoted ring-opening of aziridine-2-carboxylates: Optimization of protecting group and Lewis acid
Tirotta, Ilaria,Fifer, Nathan L.,Eakins, Julia,Hutton, Craig A.
, p. 618 - 620 (2013/02/23)
The preparation of tryptophan derivatives through the Lewis acid promoted substitution of aziridine carboxylates with indole was found to be accompanied by a ring-expansion reaction to generate an oxazolidinone byproduct. The ratio of tryptophan to oxazol
Aerobic palladium(II)-catalyzed 5-endo-trig cyclization: An entry into the diastereoselective C-2 alkenylation of indoles with tri- and tetrasubstituted double bonds
Kandukuri, Sandeep R.,Schiffner, Julia A.,Oestreich, Martin
supporting information; experimental part, p. 1265 - 1269 (2012/03/08)
The endo trick: An endo ring closure onto the trigonal β carbon atom of α,β-unsaturated acceptors that are tethered to the indole nitrogen atom followed by amide cleavage enables the diastereoselective C-2 alkenylation of indoles with fully substituted double bonds. The carboxy group functions as a synthetically useful temporary tether (see scheme). Copyright
Orthogonal protecting groups in the synthesis of tryptophanyl- hexahydropyrroloindoles
Ruiz-Sanchis, Pau,Savina, Svetlana A.,Acosta, Gerardo A.,Albericio, Fernando,Alvarez, Mercedes
supporting information; experimental part, p. 67 - 73 (2012/01/15)
The synthesis of various polycyclic systems containing aC 3a-Ni bond between a hexahydropyrrolo[2,3-b]indole and an indole tryptophan is described here. A series of experiments were performed to determine the best combination of five orthogonal protecting groups and the best reaction conditions for formation of said bond, which is a common feature among many recently discovered marine natural products.
NOVEL TRICYCLIC CHIRAL COMPOUNDS AND THEIR USE IN ASYMMETRIC CATALYSIS
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Page/Page column 18-19, (2011/11/12)
The present invention relates to a compound of general Formula (XX), its formation and its use in asymmetric catalysis. In Formula (XX) R and R31 are independently —COOR3, —R4COOR3, —R4CHO, —R4COR3, —R4CONR5R6, —R4COX, —R4OP(═O)(OH)2, —R4P(═O)(OH)2), —R4C(O)C(R3)CR5R6 and —R4CO2COR3. In addition, R31 may also be hydrogen. R3, R5 and R6 are independently hydrogen, an aliphatic group with a main chain having 1 to about 20 carbon atoms, an alicyclic group, an aromatic group, an arylaliphatic group or an arylalicyclic group, comprising 0 to about 3 heteroatoms independently selected from the group consisting of N, O, S, Se and Si. R4 an aliphatic bridge with a main chain having 1 to about 20 carbon atoms, an alicyclic bridge, an aromatic bridge, an arylaliphatic bridge or an arylalicyclic bridge, comprising 0 to about 3 heteroatoms independently selected from the group consisting of N, O, S, Se and Si, and X is halogen. In Formula (XX) R30 is —C(OH)R1R2 or —COOR14, wherein R1, R2 and R14 are independently hydrogen, an aliphatic group with a main chain having 1 to about 20 carbon atoms, an alicyclic group, an aromatic group, an arylaliphatic group or an arylalicyclic group, comprising 0 to about 3 heteroatoms independently selected from the group consisting of N, O, S, Se and Si.
A favorable, narrow, δh Hansen-parameter domain for gelation of low-molecular-weight amino acid derivatives
Curcio, Pasquale,Allix, Florent,Pickaert, Guillaume,Jamart-Gregoire, Brigitte
scheme or table, p. 13603 - 13612 (2012/01/05)
In recent years, the design of new low-molecular-weight gelators (LMWGs) has attracted considerable attention because of the interesting supramolecular architectures as well as industrial applications. In this context, the role of the organic solvent in d
Hexahydropyrrolo [2,3-b]indoles: A new class of structurally rigid tricyclic skeleton for oxazaborolidine-catalyzed asymmetric borane reduction
Xiao, Jian,Wong, Zhen Zhou,Lu, Yun Peng,Loh, Teck Peng
supporting information; experimental part, p. 1107 - 1112 (2010/07/03)
A new class of structurally rigid tricyclic chiral ligands based on the hexahydropyrrolo [2,3b]indole skeleton has been rationally designed and the catalytic abilities in asymmetric catalysis have been shown in the enantioselective borane reduction of prochiral ketones to afford the chiral alcohols in excellent yields and high enantioselectivities (up to 97% ee).
Copper-catalyzed cyclization of lodo-tryptophans: A straightforward synthesis of pyrroloindoles
Coste, Alexis,Toumi, Mathieu,Wright, Karen,Razafimahaleo, Vanessa,Couty, Francois,Marrot, Jerome,Evano, Gwilherm
supporting information; scheme or table, p. 3841 - 3844 (2009/07/01)
(Chemical Equation Presented) Pyrroloindoles are a key structural motif found in a wide number of biologically active alkaloids. Intramolecular copper-catalyzed coupling of readily accessible 2-iodo-tryptophan derivatives occurs in excellent yield, afford
Unexpected domino ring closure: highly stereoselective construction of a tetracyclic indole alkaloid ring system
Xiao, Jian,Loh, Teck-Peng
scheme or table, p. 7184 - 7186 (2009/04/10)
An unexpected highly stereoselective domino ring closure gave the tetracyclic indole alkaloid IV-2 in good yield in one hydrogenation step. Crown Copyright
