o-Nitrobenzenesulfonamides in Nucleoside Synthesis: Efficient 5‘-Aziridination of Adenosine
摘要:
5'-Aziridinoadenylates of the form 1 and a related nitrogen mustard variant have been constructed using a novel variation of the Mitsunobu reaction. Such molecules allow conversion of biological methyltransferases into nucleoside transferases, thus providing powerful tools for investigating S-adenosyl-L-methionine (SAM)-dependent methylation. We present here a highly effective synthesis of such molecules that is amenable to aziridine diversification as well as elaboration of the base moiety so as to afford "bumped" cofactor mimics compatible with "hole"-bearing mutant proteins.
o-Nitrobenzenesulfonamides in Nucleoside Synthesis: Efficient 5‘-Aziridination of Adenosine
摘要:
5'-Aziridinoadenylates of the form 1 and a related nitrogen mustard variant have been constructed using a novel variation of the Mitsunobu reaction. Such molecules allow conversion of biological methyltransferases into nucleoside transferases, thus providing powerful tools for investigating S-adenosyl-L-methionine (SAM)-dependent methylation. We present here a highly effective synthesis of such molecules that is amenable to aziridine diversification as well as elaboration of the base moiety so as to afford "bumped" cofactor mimics compatible with "hole"-bearing mutant proteins.
An improved procedure for the acetalisation of alcoholic hydroxyl functions
作者:H. C. P. F. Roelen、G. J. Ligtvoet、G. A. van der Marel、J. H. van Boom
DOI:10.1002/recl.19871061008
日期:——
Acetalisation of 3′,5′-di-O-acetyluridine in DMF with 4,4-dimethoxytetrahydro-4H-pyran and 4,4-dimethoxytetrahydro-4H-1-thiopyran in the presence of trimethylsilyl chloride (TMSiCl) afforded, after removal of the acetyl groups, 2′-O-(4-methoxytetrahydropyranyl)-uridine and its sulfur analogue, respectively. It was also established that a 3′,5′-O-(tetraisopropyldisiloxane-1,3-diyl) protected ribonucleoside
Synthesis of 2′-O-α-d-ribofuranosyladenosine, monomeric unit of poly(ADP–ribose)
作者:Sergey N. Mikhailov、Irina V. Kulikova、Koen Nauwelaerts、Piet Herdewijn
DOI:10.1016/j.tet.2008.01.028
日期:2008.3
The first chemical synthesis of 2′-O-α-d-ribofuranosyladenosine, monomericunit of poly(ADP–ribose), has been achieved starting from 3′,5′-O-bis protected 9-(2-O-α-d-arabinofuranosyl-β-d-ribofuranosyl)-adenine. Configurational inversion of 2′-hydroxyl group of arabinose moiety was performed by oxidation–reduction sequence.
2'-的第一化学合成ö -α-d-ribofuranosyladenosine,聚(ADP-核糖)的单体单元,已经实现了从3开始',5'- ø -双保护的9-(2- Ò -α- d-阿拉伯呋喃糖基-β-d-呋喃核糖基)-腺嘌呤。阿拉伯糖部分的2'-羟基的构型转化是通过氧化还原序列进行的。