我们全面介绍了头孢菌素B(Tcn-B)的总合成,头孢菌素B(Tcn-B)是一种具有显着抗生素特性的天然糖基化大环内酯。我们的策略是基于我们合成头孢菌素B糖苷配基的经验以及独特的1,2-顺式糖基化步骤。我们使用亚砜异头离去基团结合有远程3- Ô供体上的吡啶甲酸基团允许依赖于H键介导的糖苷配基的高度β-选择性鼠李糖基化和noviosylation。鼠李糖基化的C1-C3片段通过Suzuki-Miyaura交叉偶联固定在C4-C19糖苷配基片段上。环大小选择性的Shiina宏观内酯化提供了一个半糖基化糖苷配基,该糖苷配基直接参与了noviolysation步骤,具有几乎全部的β选择性。最后,设计了一种新颖的脱保护方法,用于去除苯酚上的2-萘基甲基醚,并有效去除所有保护基团,从而提供了合成的tiacumicin B.
NUCLEIC ACID AMPLIFICATION AND SEQUENCING BY SYNTHESIS WITH FLUOROGENIC NUCLEOTIDES
申请人:Xie Xiaoliang Sunney
公开号:US20130053252A1
公开(公告)日:2013-02-28
In general, the invention features methods and systems for sequencing of nucleic acids based on the measurement of the incorporation of fluorogenic nucleotides in microreactors. The invention provides numerous advantages over previous systems such as unambiguous determination of sequence, fast cycle time, long read lengths, low overall cost of reagents, low instrument cost, and high throughput. The invention also features methods and kits for nucleic acid amplification. The amplification and sequencing aspects of the invention may or may not be employed in conjunction with one another. The invention also features fluorogenic nucleotides that may be used in the sequencing methods of the invention.