Convergent synthesis of a fluorescence-quenched glycopeptide as a potential substrate for peptide: N-glycosidases
摘要:
The fluorescence-quenched glycopeptide N-gamma-[2-acetamido-6-(2'-amino)benzamido-2,6-dideoxy-beta-D-glucopyranosyl]-N-alpha-benzoyl-Asn-Tyr(NO2)-OMe, having anthranilamide/3-nitrotyrosine as the donor/acceptor pair, was synthesized via a convergent route involving the EEDQ-mediated coupling of 2-acetamido-2,3-di-O-acetyl-6-(2'-tert-butoxycarbonylamino)benzamido-2,6-dideoxy-beta-D-glucopyranosylamine with N-benzoyl-Asp-Tyr(NO2)-OMe, followed by deprotection. (C) 1998 Elsevier Science Ltd. All rights reserved.
Convergent synthesis of a fluorescence-quenched glycopeptide as a potential substrate for peptide: N-glycosidases
摘要:
The fluorescence-quenched glycopeptide N-gamma-[2-acetamido-6-(2'-amino)benzamido-2,6-dideoxy-beta-D-glucopyranosyl]-N-alpha-benzoyl-Asn-Tyr(NO2)-OMe, having anthranilamide/3-nitrotyrosine as the donor/acceptor pair, was synthesized via a convergent route involving the EEDQ-mediated coupling of 2-acetamido-2,3-di-O-acetyl-6-(2'-tert-butoxycarbonylamino)benzamido-2,6-dideoxy-beta-D-glucopyranosylamine with N-benzoyl-Asp-Tyr(NO2)-OMe, followed by deprotection. (C) 1998 Elsevier Science Ltd. All rights reserved.
A Reinvestigation of the α-Alkylation of 4-Monosubstituted 2-phenyloxazol-5(4<i>H</i>)-ones (‘azlactones’): A general entry into highly functionalized α,α-disubstituted α-amino acids
Novel, more reliable and general reaction conditions for the α-alkylation of 4-monosubstituted2-phenyloxazol-5(4H)-ones ( = 4-monosubstituted 2-phenyl-azlactones) rac-2 to 4,4-disubstituted 2-phenyloxazol-5(4H)-ones rac-1 were found (Scheme 2). Thus, a whole range of highlyfunctionalized rac-1 were prepared in medium-to-good overall yields (40-90%, see Table). Azlactones rac-1 are ideal precursors
Convergent synthesis of a fluorescence-quenched glycopeptide as a potential substrate for peptide: N-glycosidases
作者:Vito Ferro、Larry Weiler、Stephen G. Withers
DOI:10.1016/s0008-6215(98)00011-1
日期:1998.1
The fluorescence-quenched glycopeptide N-gamma-[2-acetamido-6-(2'-amino)benzamido-2,6-dideoxy-beta-D-glucopyranosyl]-N-alpha-benzoyl-Asn-Tyr(NO2)-OMe, having anthranilamide/3-nitrotyrosine as the donor/acceptor pair, was synthesized via a convergent route involving the EEDQ-mediated coupling of 2-acetamido-2,3-di-O-acetyl-6-(2'-tert-butoxycarbonylamino)benzamido-2,6-dideoxy-beta-D-glucopyranosylamine with N-benzoyl-Asp-Tyr(NO2)-OMe, followed by deprotection. (C) 1998 Elsevier Science Ltd. All rights reserved.