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Hydroxytryptophans

Recent Advances in the Chemistry of 1-HydroxyindoIes, 1-Hydroxytryptophans, and 1-Hydroxytryptamines... [Pg.100]

As a result, we could open the door to a new frontier in indole chemistry. Various 1-hydroxyindoles (4a), l-hydroxytryptophans(la), 1-hydroxytryptamines (lb), and their derivatives have been given birth for the first time. As predicted, 1-hydroxytryptophan and 1-hydroxytryptamine derivatives are found to undergo previously unknown nucleophilic substitution reactions. In addition, we have been uncovering many interesting reactivities characteristic of 1-hydroxyindole structures. From the synthetic point of view, useful building blocks for indole alkaloids, hither to inaccessible by the well-known electrophilic reactions in indole chemistry, have now become readily available. Many biologically interesting compounds have been prepared as well. [Pg.103]

In this review, our recent developments in the chemistry of 1-hydroxyindoles, 1-hydroxytryptophans, and 1-hydroxytryptamines, attained between the beginning of 1999 and the end of May 2001, are summarized together with results obtained... [Pg.103]

Hydroxyindoles carrying a side chain containing a free NH2, OH, or COOH functional group are unstable. Therefore, 1-hydroxytryptophan, -tryptamine, and -indole-3-acetic acid have not been prepared yet. [Pg.109]

Regioselective nucleophilic substitution at the 5 position is proved to occur when 1-hydroxytryptophan and -tryptamine derivatives are treated with 85% HCOOH (99H1157). Truly amazing is the fact that only substrates carrying a C—C—N structure in the side chain at the 3 position can undergo this regioselective substitution. [Pg.129]

In contrast, substrates having other struetural types of side ehain at the 3 position dimerize under aeidie eonditions, and never produee the 5-substituted produets. These faets seem to support the 1-Hydroxyindole Hypotheses, whieh elaim the formation of serotonin from 1-hydroxytryptophan and/or -tryptamine in the aeidie eompartment within eukaryotie eells. [Pg.130]

With 1-hydroxytryptophan derivatives, similar substituent effects are observed (99H2815). In order to realize better yields of 5-substituted tryptophans, car-boxy and amino groups are transformed to ester and/or amide groups, choosing the 1-methoxy moiety as a leaving group. As a result, ( )-Ab-acetyl-5-chlorotryptophan methyl ester (219, 52%) is obtained together with 220 (7%) from ( )-218 by the reaction with aqueous HCl (Scheme 32). ( )-5-Bromo-Ab-methoxycarbonyltryptophan methylamide (222, 50%) becomes readily available... [Pg.132]

Final examples of applications of our results (91CPB1905, 99H1157) in 1-hydroxytryptophan chemistry come from the work of Boger and co-workers (99JA6197) on the synthesis of HUN 7293 (293, Scheme 46) (96MI69) and from Kitahara and co-workers (200 IHl) on the synthesis of apicidin (301) (96TL8077). [Pg.145]

Very little is known about the occurrence of 1-hydroxytryptamine and/or 1-hydroxytryptophan derivatives in living organisms. Many 1-methoxyindole derivatives have been isolated as natural products (87MI629, 88BCJ285, 92H1877, 93MI22) for the simple reason that they are stable under isolating processes. [Pg.149]

No 1 -hydroxytryptamine or -tryptophan alkaloid that lacks a stabilizing group on the indole nucleus has been reported yet. However, isolation of37,38a, 38b, HUN-7293 (293) (96MI69), and apicidin (301) (96TL8077) offers indirect evidence for the existence of 1-hydroxytryptamines and/or 1-hydroxytryptophans in living organisms. We believe their isolation will be reported in the near future. [Pg.150]

Homolytic substitution of heteroaromatic compounds, 16, 123 Hydantoins, chemistry of, 38, 177 Hydrogen cyanide derivatives, synthesis of heterocycles from, 41, 1 Hydrogen exchange base-catalyzed, 16, 1 one-step (labeling) methods, 15, 137 Hydrogenated porphyrin derivatives hydroporphyrins, 43, 73 Hydroxamic acids, cyclic, 10, 199 1 -Hydroxyindoles, 1 -hydroxytryptophans, and 1-hydroxytryptamines,... [Pg.309]

Somei et al. have also shown that nucleophilic additions occur on the indole nucleus of 1-hydroxyindole and 1-hydroxytryptophan residues in the presence of 85% formic acid [3]. For example, indole displaces the hydroxyl group from (DL)-1-hydroxytryptophan methyl ester (106) to provide the l-(indol-3-yl)indole 107 in 51% yield. When other nucleophiles such as phenol, naphthol, and pyrrole are used, a more complicated mixture of products is isolated. [Pg.137]

Somei M (2006) A Frontier in indole chemistry 1-hydroxyindoles, 1-hydroxytryptamines, and 1-hydroxytryptophans. In Topics in heterocyclic chemistry. Springer, Berlin/Heidelberg, pp 77-111... [Pg.138]

III. Physical Properties of 1-Hydroxyindoles, 1-Hydroxytryptophans, and 1-Hydroxy tryptamines... [Pg.110]


See other pages where Hydroxytryptophans is mentioned: [Pg.102]    [Pg.104]    [Pg.108]    [Pg.148]    [Pg.150]    [Pg.313]    [Pg.306]    [Pg.191]    [Pg.282]    [Pg.349]    [Pg.103]    [Pg.103]    [Pg.106]    [Pg.106]    [Pg.150]   
See also in sourсe #XX -- [ Pg.82 , Pg.103 ]

See also in sourсe #XX -- [ Pg.82 , Pg.103 ]

See also in sourсe #XX -- [ Pg.82 , Pg.103 ]

See also in sourсe #XX -- [ Pg.82 , Pg.103 ]




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1 -Hydroxyindoles, 1 -hydroxytryptophans

1-Hydroxyindoles, 1-hydroxytryptophans and 1-hydroxytryptamines

2-Bromo-5-hydroxytryptophan

5- Hydroxytryptophan assay

5- Hydroxytryptophan, from tryptophan

5-Hydroxytryptophan

5-Hydroxytryptophan 5HTP

5-Hydroxytryptophan decarboxylation

5-Hydroxytryptophan formation

5-Hydroxytryptophan hydroxylase

5-Hydroxytryptophan inhibitors

5-Hydroxytryptophan occurrence

5-Hydroxytryptophan structure

5-Hydroxytryptophan synthesis

5-hydroxytryptophan antidepressants

A-Hydroxytryptophan

DL-5-Hydroxytryptophan

Diethylacetylamino malonate Hydroxytryptophan

Formation of 5-Hydroxytryptophan

Hydroxytryptophan decarboxylase

Hydroxytryptophan to Serotonin

Hydroxytryptophane

Hydroxytryptophane

In the chemistry 1-hydroxytryptophans, and

N-Hydroxytryptophan

Oxindolylalanine (Hydroxytryptophan)

Serotonin 5-hydroxytryptophan decarboxylase

Tissues 5-hydroxytryptophan decarboxylase

Tryptophan hydroxylase 5-hydroxytryptophan

Urine 5-hydroxytryptophan

Vivo Findings Related to 5-Hydroxytryptophan Decarboxylase

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