Synthesis of oligomers of tetrahydrofuran amino acids: furanose carbopeptoids
作者:Martin D. Smith、Daniel D. Long、Timothy D. W. Claridge、George W. J. Fleet、Daniel G. Marquess、Daniel G. Marquess
DOI:10.1039/a805364b
日期:——
An acid catalysed ring rearrangement of a triflate derivative of D-mannono-?-lactone 6 is the key step in the synthesis of the C-glycosyl sugar amino acid derivatives 3 and 4, examples of carbohydrate amino acid building blocks with specific conformational preferences suitable for incorporation into combinatorial amide libraries; homo-oligomerisation via solution phase coupling procedures affords furanose carbopeptoids 1 which adopt novel solution state secondary structures.
Cyclic Homooligomers of Furanoid Sugar Amino Acids
作者:T. K. Chakraborty、P. Srinivasu、E. Bikshapathy、R. Nagaraj、M. Vairamani、S. Kiran Kumar、A. C. Kunwar
DOI:10.1021/jo034586u
日期:2003.8.1
Cyclic homooligomers of mannose-derived furanoidsugaraminoacid 1 [H-Maa(Bn(2))-OH] were synthesized by using BOP reagent in the presence of DIPEA under dilute conditions that converted the sugaraminoacid monomer directly into its cyclic homooligomers 3a and 4a. The glucose-based sugaraminoacid 2 [H-Gaa(Bn(2))-OH] under the same reaction conditions gave a bicyclic lactam 5a as the major product
Complex tetrahydrofurans from carbohydrate lactones: THF amino acids as building blocks for unnatural biopolymers
作者:Daniel D. Long、Martin D. Smith、Angeles Martín、Joseph R. Wheatley、David G. Watkin、Mattaius Müller、George W. J. Fleet
DOI:10.1039/b111258a
日期:——
The multi-gram syntheses of two epimeric six-carbon tetrahydrofurancarboxylates based upon a D-arabinofuranose template are described. An approach to 3-O-benzyl protected derivatives is also detailed. Introduction of nitrogen at C-6 of these scaffolds leads to the generation of building blocks suitable for the generation of oligomers which possess well defined secondary structures. Radical bromination facilitates introduction of nitrogen at C-2, to afford anomeric α-amino acid derivatives which are elaborated to two unnatural diastereomers of the potent herbicidal natural product hydantocidin. X-Ray crystal structures of N-methyl-2-azido-2-deoxy-α-D-arabino-hex-2-ulofuranosonamide and N-dodecyl-2-azido-2-deoxy-β-D-arabino-hex-2-ulofuranosonamide are also disclosed.