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Synthese cyclischer Depsipeptide durch direkte Amid-Cyclisierung: 12gliedrige Depsipeptide mit alternierender Sequenz von α-Hydroxy- und α-Aminosäuren


Obrecht, Daniel; Heimgartner, Heinz (1990). Synthese cyclischer Depsipeptide durch direkte Amid-Cyclisierung: 12gliedrige Depsipeptide mit alternierender Sequenz von α-Hydroxy- und α-Aminosäuren. Helvetica Chimica Acta, 73(1):221-228.

Abstract

The reaction of 3-(dimethylamino)-2,2-dimethyl-2H-azirine (1; R1 = R2= R3 = R4= Me) with alpha-hydroxycarboxylic acids, followed by selective hydrolysis of the terminal dimethylamide group yields the dipeptide analogues 15a and 18b (Schemes 3 and 4). After protection of the OH group (to 16a and 19, resp.), coupling with the C-terminus-protected derivatives 14 and 18a, respectively, by a modified 1,1'-carbonyldiimidazole procedure followed by hydrolysis gives the linear depsipeptides 17c and 20, respectively. Treatment with HCI gas in toluene at 100° leads to the cyclic depsipeptides 21 and 22 in very good yield. The two model reactions show that the 'azirine/oxazolone-method', combined with the 'direct amide cyclization', is a versatile procedure for the synthesis of cyclic depsipeptides containing alpha,alapha-disubstituted alpha-amino acids.

Abstract

The reaction of 3-(dimethylamino)-2,2-dimethyl-2H-azirine (1; R1 = R2= R3 = R4= Me) with alpha-hydroxycarboxylic acids, followed by selective hydrolysis of the terminal dimethylamide group yields the dipeptide analogues 15a and 18b (Schemes 3 and 4). After protection of the OH group (to 16a and 19, resp.), coupling with the C-terminus-protected derivatives 14 and 18a, respectively, by a modified 1,1'-carbonyldiimidazole procedure followed by hydrolysis gives the linear depsipeptides 17c and 20, respectively. Treatment with HCI gas in toluene at 100° leads to the cyclic depsipeptides 21 and 22 in very good yield. The two model reactions show that the 'azirine/oxazolone-method', combined with the 'direct amide cyclization', is a versatile procedure for the synthesis of cyclic depsipeptides containing alpha,alapha-disubstituted alpha-amino acids.

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Additional indexing

Other titles:Synthesis of Cyclic Depsipeptides via Direct Amide Cyclization: Cyclic Depsipeptides with 12-Ring Atoms and Alternating Sequence of α-Hydroxy and α-Amino Adds
Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Department of Chemistry
Dewey Decimal Classification:540 Chemistry
Language:German
Date:1990
Deposited On:27 Mar 2014 15:38
Last Modified:05 Apr 2016 17:46
Publisher:Wiley-Blackwell
ISSN:0018-019X
Funders:Schweizerischer Nationalfonds zur Förderung der wissenschaftlichen Forschung, F. Hoffmann-La Roche AG, Basel, Prof. Hans-E.-Schmid-Stiftung
Publisher DOI:https://doi.org/10.1002/hlca.19900730126

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