The invention provides methods of preparing macrocycles including macrocycle stabilized peptides (MSPs). Macrocycles and MSPs are prepared according to nucleophilic capture of an iminoquinomethide type intermediate generated from a suitably substituted 2-amino-thiazol-5-yl carbinol. The preferred nucleophile may be selected from an electron rich aromatic moiety in the case of macrocycles and, in the case of MSPs, at least one amino acid comprises an electron rich aromatic moiety. In addition, the concept can be extended to other related 5-membered heterocyclic systems in place of the thiazole, such as imidazole or oxazole. The conditions for the generation of the corresponding iminoquinomethide type intermediates may be similar or different than the conditions used for the 2-amino-thiazol-5-yl carbinol.
The Directed Cleavage of Substituted 1-Phenylethylamines: A Novel Route to Enantiomerically Pure β-Amino Acid Esters and β-Lactams
作者:Gerhard Bringmann、Torsten Geuder
DOI:10.1055/s-1991-26583
日期:——
An efficient novel access to enantiomerically pure ß-amino acid esters and ß-lactams (e.g., methyl (3S,4S)-1-(tert-butyldimethylsilyl-4-methyl-2-oxoazetidine-3-carboxylate) from optically active 1-arylethylamines is described. Regiospecific cleavage is performed by Birch reduction and subsequent ozonolysis.