Tetrahydrofuran amino acids: Secondary structure in tetrameric and octameric carbopeptoids derived from a D-allo 5-(aminomethyl)tetrahydrofuran-2-carboxylic acid
The ring contraction of δ-lactones with leaving group α-substituents: a strategy for the synthesis of 2,5-disubstituted highly functionalised homochiral tetrahydrofurans
作者:Sik-Man S. Choi、Paul M. Myerscough、Antony J. Fairbanks、Ben M. Skead、Claire J. F. Bichard、Simon J. Mantell、Jong Chan Son、George W. J. Fleet、John Saunders、David Brown
DOI:10.1039/c39920001605
日期:——
Treatment of derivatives of δ-lactones having a leaving group at C-2 with methanol in the presence of base gives methyl tetrahydrofuran-α-carboxylates in good to excellent yield with a high degree of stereocontrol of the carbon substituents at C-2 and C-5.
From sequencamers to foldamers? Tetrameric furanose carbopeptoids from cis- and trans-5-aminomethyl-tetrahydrofuran-2-carboxylates
作者:Daniel D. Long、Natasha L. Hungerford、Martin D. Smith、Dominic E.A. Brittain、Daniel G. Marquess、Timothy D.W. Claridge、George W.J. Fleet
DOI:10.1016/s0040-4039(99)00110-0
日期:1999.3
The synthesis of three stereoisomeric cis- and trans-5-azidomelhyl-tetrahydrofuran-2-carboxylates in which a ketal-protected cis-diol unit is present is described. The monomers undergo efficient oligomerisation to tetrameric carbopeptoids in which the diol protection facilitates ready purification by chromatography which augurs well for the formation of homogeneous higher polymers. (C) 1999 Elsevier Science Ltd. All rights reserved.
Tetrahydrofuran amino acids: Secondary structure in tetrameric and octameric carbopeptoids derived from a D-allo 5-(aminomethyl)tetrahydrofuran-2-carboxylic acid
作者:Natasha L. Hungerford、Timothy D. W. Claridge、Mark P. Watterson、Robin T. Aplin、Andres Moreno、George W. J. Fleet
DOI:10.1039/b002996n
日期:——
The synthesis of a D-allo-5-(azidomethyl)tetrahydrofuran-2-carboxylate as an amino acid precursor (in which the carboxylic acid is cis to the azidomethyl substituent and trans to the diol moiety) is reported from D-ribose. The oligomerisation of this monomer to dimeric, tetrameric and octameric carbopeptoids is described. NMR studies into the solution structures of cyclohexylidene-protected oligomers and of a deprotected tetramer with eight free hydroxy groups are described.