Synthesis of pyrrolo[2,3-d]pyrimidines via cyclocondensation of β-alkoxy- and β-amino-α-bromoaldehydes
作者:Charles J Barnett、Lana M Grubb
DOI:10.1016/s0040-4039(00)01768-8
日期:2000.12
A series of β-alkoxy- and β-amino-α-bromoaldehydes was synthesized. The cyclocondensation of these intermediates with 2,4-diamino-6-hydroxypyrimidine yielded a series of pyrrolo[2,3-d]pyrimidines containing heteroatoms in the side chain. Choice of protecting group proved critical to the success of the bromination and cyclocondensation reactions. A number of oxygen and nitrogen protecting groups were
合成了一系列的β-烷氧基和β-氨基-α-溴醛。这些中间体与2,4-二氨基-6-羟基嘧啶的环缩合产生一系列在侧链上含有杂原子的吡咯并[2,3- d ]嘧啶。事实证明,保护基的选择对于溴化和环缩合反应的成功至关重要。检查了许多氧和氮保护基,并在此描述了结果。
Syntheses of <sup>15</sup>N-labeled pre-queuosine nucleobase derivatives
作者:Jasmin Levic、Ronald Micura
DOI:10.3762/bjoc.10.199
日期:——
Pre-queuosine or queuine (preQ1) is a guanine derivative that is involved in the biosynthetic pathway of the hypermodified tRNAnucleoside queuosine (Que). The core structure of preQ1 is represented by 7-(aminomethyl)-7-deazaguanine (preQ1 base). Here, we report the synthesis of three preQ1 base derivatives with complementary (15)N-labeling patterns, utilizing [(15)N]-KCN, [(15)N]-phthalimide, and
We report the synthesis of a peptide nucleic acid (PNA) monomer containing preQ1, a positively charged guanine analogue. The new monomer was incorporated into PNA oligomers using standard Fmoc-chemistry-based solid-phase synthesis. The preQ1 unit-containing PNA oligomers exhibited improved affinity for their complementary DNA through electrostatic attraction, and their sequence specificity was not