Cleavage of Oligonucleotides from Solid-Phase Supports Using o-Nitrobenzyl Photochemistry
摘要:
Oligonucleotides are cleaved from modified solid phase supports using the o-nitrobenzylintramolecular photochemical redox reaction. Oligonucleotides can be cleaved before or after removal of protecting groups. Employment of phosphoramidites containing allyloxy protecting groups that are labile to Pd-O enables one to deprotect oligonucleotides without the use of base. The yields of isolated oligonucleotides relative to yields obtained using conventional hydrolytic cleavage vary between 59% and 87%. Tritium labeling indicates that small amounts of thymidine thymidine photodimers are formed during the photolysis time required to obtain good yields of oligonucleotides from the succinate linked photolabile support (4). Photodimer formation is minimized (<7%) during the prolonged irradiation required when cleaving oligonucleotides from 7 by employing bandpass filtering.
Photochemical release of protected oligonucleotides containing 3′-glycolate termini
作者:Marc M. Greenberg
DOI:10.1016/0040-4020(94)00946-r
日期:1995.1
Protected oligonucleotidescontaining3′-glycolate termini that are suitable for further elaboration are released from their solid phase supports using the o-nitrobenzyl intramolecular photochemical redox reaction. The yields of isolated oligonucleotides of varying sequence, ranging between 12 and 20 nucleotides long are between 45% and 79%, under conditions that have been previously shown to form
Protectedpeptidefragments corresponding to the 12–18, 31–38 and 59–67 segments of the Uteroglobin monomer have been synthesised on a solid support using the photolabile ortho-nitrobenzyl unit as a handle. Attachment of the first amino acid of the sequence has been carried out in three different ways and a new procedure for avoiding the formation of DKPs in the coupling of the third amino acid with
Cleavage of Oligonucleotides from Solid-Phase Supports Using o-Nitrobenzyl Photochemistry
作者:Marc M. Greenberg、John L. Gilmore
DOI:10.1021/jo00083a014
日期:1994.2
Oligonucleotides are cleaved from modified solid phase supports using the o-nitrobenzylintramolecular photochemical redox reaction. Oligonucleotides can be cleaved before or after removal of protecting groups. Employment of phosphoramidites containing allyloxy protecting groups that are labile to Pd-O enables one to deprotect oligonucleotides without the use of base. The yields of isolated oligonucleotides relative to yields obtained using conventional hydrolytic cleavage vary between 59% and 87%. Tritium labeling indicates that small amounts of thymidine thymidine photodimers are formed during the photolysis time required to obtain good yields of oligonucleotides from the succinate linked photolabile support (4). Photodimer formation is minimized (<7%) during the prolonged irradiation required when cleaving oligonucleotides from 7 by employing bandpass filtering.