A base labile protecting group for peptide synthesis: 2,2 -Bis(4′-nitrophenyl)ethan-1-oxycarbonyl urethanes
摘要:
A base labile urethane (Bnpeoc) group derived from 2,2-bis(4'-nitrophenyl)ethan-1-ol has been developed as an amine protecting group. This protecting group may be cleaved using the reagents, DBN, DBU, DBU/HOAc and piperidine. The preparations of N-alpha-Bnpeoc amino acids and applications to peptide/glycopeptide synthesis are described.
A base labile protecting group for peptide synthesis: 2,2 -Bis(4′-nitrophenyl)ethan-1-oxycarbonyl urethanes
摘要:
A base labile urethane (Bnpeoc) group derived from 2,2-bis(4'-nitrophenyl)ethan-1-ol has been developed as an amine protecting group. This protecting group may be cleaved using the reagents, DBN, DBU, DBU/HOAc and piperidine. The preparations of N-alpha-Bnpeoc amino acids and applications to peptide/glycopeptide synthesis are described.
New labile protecting groups for the anticipated synthesis of oligoribonucleotides were developed and introduced via their carbonochloridates 8 – 11 at the 5′-O position of thymidine (15) to form 16, 18, 21, and 24 in good yields (Schemes 2 and 3). Similarly, the 5′-O-diphenylphosphinoyl(dpp)-protected thymidine derivative 27 was synthesized with diphenylphosphinoyl chloride 14 as the reactive reagent
Cycloaddition reactions of N-alkoxycarbonyl-4-quinolones
作者:John R Nicholson、Gurdial Singh、Kevin J McCullough、Richard H Wightman
DOI:10.1016/0040-4020(89)80121-8
日期:1989.1
diene gave rise to two cycloadducts 3,10-dioxo-5-ethoxycarbonyl-1-methoxy-10a-nitro-octahydroacridines which had arisen from addition from the exo and endo transistion states. The quinolones (4a,b) on reaction with Gessons diene (12) and the ketene acetals (15) and (16), afforded Michael adducts 2-[1,3-biscarboethoxy-1,2-dihydroquinolin-2-yl-4-hydroxy]-methyl-1-carboethoxy-4-methoxycyclohexa-1,3-diene (14a)
NICHOLSON, JOHN R.;SINGH, GURDIAL;MCCULLOUGH, KEVIN J.;WIGHTMAN, RICHARD +, TETRAHEDRON, 45,(1989) N, C. 889-908
作者:NICHOLSON, JOHN R.、SINGH, GURDIAL、MCCULLOUGH, KEVIN J.、WIGHTMAN, RICHARD +
DOI:——
日期:——
A base labile protecting group for peptide synthesis: 2,2 -Bis(4′-nitrophenyl)ethan-1-oxycarbonyl urethanes
作者:Robert Ramage、Alexander J. Blake、Michael R. Florence、Thomas Gray、Gilles Raphy、Peter L. Roach
DOI:10.1016/s0040-4020(01)81953-0
日期:1991.9
A base labile urethane (Bnpeoc) group derived from 2,2-bis(4'-nitrophenyl)ethan-1-ol has been developed as an amine protecting group. This protecting group may be cleaved using the reagents, DBN, DBU, DBU/HOAc and piperidine. The preparations of N-alpha-Bnpeoc amino acids and applications to peptide/glycopeptide synthesis are described.