Synthesis of the Ribosomal P-Site Substrate CCA-pcb
作者:Minghong Zhong、Scott A. Strobel
DOI:10.1021/ol052484f
日期:2006.1.1
CCA-pcb (cytidylyl-(3'5')-cytidylyl-(3'5')-3'(2')-O-(N-(6-D-(+)-biotinoylaminohexanoyl)-L-phenylalanyl)adenosine), a ribosomal P-site substrate, was synthesized by phosphoramidite chemistry in 26 steps with an overall yield of 18%, starting from biotin. The synthesis relies on the judicious selection of orthogonal silyl protecting groups for the 5'-hydroxyls and acid-labile protecting groups (DMTr, AcE, and MeE) at other reactive sites to ensure the intactness of the labile ester. Both X-esterification and nucleotide coupling were accomplished by in situ activation with imidazolium ions.
Synthesis of Isotopically Labeled P-Site Substrates for the Ribosomal Peptidyl Transferase Reaction
作者:Minghong Zhong、Scott A. Strobel
DOI:10.1021/jo702070m
日期:2008.1.1
(cytidine), 93% for 2‘/3‘-18O (adenosine), and 64% for 1-18O (Phe). A new synthesis of highly enriched [1-18O2]phenylalanine has been developed. The synthesis of [3‘-18O]adenosine was improved by Lewis acid aided regioselective ring opening of the epoxide and by an economical SN2−SN2 method with high isotopic enrichment (93%). Such substrates are valuable for studies of the ribosomal peptidyl transferase reaction
核糖体 P 位点底物的同位素异构体,即三核苷酸肽偶联物 CCA-pcb(Zhong, M.;Strobel, SA Org. Lett. 2006 , 8 , 55-58),已通过 26-35 个步骤设计和合成。这些包括氨基酸的 α-氢、羰基碳和羰基氧、腺苷的 O2' 和 O3' 处的单个同位素取代,以及两个胞苷的 N3 和 N4 中的远程标记。这些同位素是通过将胞苷酰-(3',5')-胞苷亚磷酰胺同位素作为常见的合成中间体与同位素取代的 A-Phe-cap-生物素 (A-pcb) 偶联来合成的。1- 13 C (Phe)、2- 2 H (Phe) 和 3,4- 15 N 2的同位素富集率高于 99%(胞苷),2'/3'- 18 O (腺苷)为 93% ,1- 18 O (Phe)为 64% 。已开发出一种高富集 [1- 18 O 2 ] 苯丙氨酸的新合成方法。[3'- 18 O]腺苷的合