Total Synthesis of (+)-Batzelladine A and (−)-Batzelladine D via [4 + 2]-Annulation of Vinyl Carbodiimides with <i>N</i>-Alkyl Imines
作者:Michael A. Arnold、Kenneth A. Day、Sergio G. Durón、David Y. Gin
DOI:10.1021/ja063860+
日期:2006.10.1
this strategy, together with additional key steps such as long-range directed hydrogenation and diastereoselective intramolecular iodo-amination, led to highly convergent total syntheses of (-)-batzelladineD and (+)-batzelladine A with excellent stereocontrol.
已经开发出乙烯基碳二亚胺与手性 N-烷基亚胺的非对映选择性 [4 + 2]-环化,以获取 batzelladine 生物碱的立体化学丰富的多环胍核。该策略的应用,连同其他关键步骤,如远程定向氢化和非对映选择性分子内碘胺化,导致 (-)-batzelladine D 和 (+)-batzelladine A 的高度收敛全合成具有出色的立体控制。
Hydrophilic and Cell-Penetrable Pyrrolidinyl Peptide Nucleic Acid via Post-synthetic Modification with Hydrophilic Side Chains
Peptide nucleic acid (PNA) is a nucleic acid mimic in which the deoxyribose–phosphate was replaced by a peptide-like backbone. The absence of negative charge in the PNA backbone leads to several unique behaviors including a stronger binding and salt independency of the PNA–DNA duplex stability. However, PNA possesses poor aqueous solubility and cannot directly penetrate cell membranes. These are major
Overcoming Barriers in Polycarbonate Synthesis: A Streamlined Approach for the Synthesis of Cyclic Carbonate Monomers
作者:Eddy W. P. Tan、James L. Hedrick、Pedro L. Arrechea、Tim Erdmann、Vivien Kiyek、Simon Lottier、Yi Yan Yang、Nathaniel H. Park
DOI:10.1021/acs.macromol.0c02880
日期:2021.2.23
Accessing cyclic carbonate monomers on a large scale is critical for the development of any new carbonate-based materials platform. The synthesis of carbonate monomers can be a challenging and tedious endeavor requiring multiple synthetic steps and purifications. To address this, we report a drastically improved process for the synthesis of carbonate monomers via a two-step route that avoids the use