Published as part of the Special Topic Modern Cyclization Strategies in Synthesis Abstract An iridium/dppf complex efficiently catalyzed the oxidativecyclization of N-sulfonyl alkenyl amides and alkenoic acids. Electron-deficient alkenes were effective as sacrificial hydrogen acceptors. High selectivity of the oxidativecyclization over the competing addition reaction has been realized by the use
Misacylated Transfer RNAs Having a Chemically Removable Protecting Group
作者:Michiel Lodder、Serguei Golovine、Andrei L. Laikhter、Vladimir A. Karginov、Sidney M. Hecht
DOI:10.1021/jo971692l
日期:1998.2.1
The 4-pentenoyl group and a number of derivatives have been studied as protectinggroups for N(alpha) of the aminoacyl moiety in misacylated tRNAs. The unsubstituted 4-pentenoyl group itself was found to function as efficiently as any of the derivatives studied. Four different N-(4-pentenoyl)aminoacyl-tRNA(CUA)s were prepared and shown to undergo deprotection readily upon admixture of aqueous iodine;
Unusual iodine catalyzed lactonization of γ-methyl-γ,δ-pentenoic acids: A facile synthesis of γ,γ-dimethyl-γ-butyrolactones
作者:Kyoung Mahn Kim、Eung K. Ryu
DOI:10.1016/0040-4039(96)00026-3
日期:1996.2
γ,γ-Dimethyl-γ-butyrolactones were exclusively obtained from γ-methyl-γ,δ-pentenoicacids with a catalytic amount of iodine in good yields in methylene chloride.
γ,γ-二甲基-γ-丁内酯仅从γ-甲基-γ,δ-戊烯酸中以催化量的碘在二氯甲烷中以高收率获得。
Iodoarene-Catalyzed Oxyamination of Unactivated Alkenes to Synthesize 5-Imino-2-Tetrahydrofuranyl Methanamine Derivatives
作者:Xiao-Jun Deng、Hui-Xia Liu、Lu-Wen Zhang、Guan-Yu Zhang、Zhi-Xiang Yu、Wei He
DOI:10.1021/acs.joc.0c02047
日期:2021.1.1
alkene by an in situ generated cationic iodonium(III) intermediate, which is subsequently attacked by an oxygen atom (instead of nitrogen) of amides to form a five-membered ring intermediate. Finally, this intermediate undergoes an SN2 reaction by NTs2 as the nucleophile to give the oxygen and nitrogen difunctionalized 5-imino-2-tetrahydrofuranyl methanamine product. An asymmetric variant of the present
此处报道的是室温下无金属的碘代芳烃催化的未活化烯烃的氧化。在此过程中,烯烃通过酰胺基团的氧原子和外源HNT 2分子中的氮进行双官能化。这种温和的露天反应提供了对N-双甲苯磺酰基取代的5-亚氨基-2-四氢呋喃基甲胺衍生物的有效合成,这是药物开发和生物学研究的重要主题。基于实验和密度泛函理论计算的机理研究表明,这种转变是通过原位活化底物烯烃而进行的生成的阳离子碘鎓(III)中间体,随后被酰胺的氧原子(而不是氮)攻击形成五元环中间体。最后,该中间体通过作为亲核试剂的NTs 2经历S N 2反应,得到氧和氮双官能化的5-亚氨基-2-四氢呋喃基甲胺产品。使用手性碘代芳烃作为催化剂的本发明烯烃氧化胺的不对称变体对于某些底物也给出了有希望的结果。
Aminolactonization of Unactivated Alkenes Catalyzed by Aryl Iodine
作者:Lu-Wen Zhang、Xiao-Jun Deng、Dong-Xu Zhang、Qin-Qin Tian、Wei He
DOI:10.1021/acs.joc.1c00074
日期:2021.4.2
protocol of the aryl iodine-catalyzed aminolactonization of unactivated alkenes under oxidation conditions was first reported to efficiently construct diverse amino lactones in a short time using HNTs2 as the compatible nitrogen source. In addition, we investigated the influence of the reaction rate based on the structure of the iodoarene precatalyst, which revealed the selective adjustment effect on aminolactonization