Synthesis of Polysubstituted Isoquinolines and Related Fused Pyridines from Alkenyl Boronic Esters via a Copper-Catalyzed Azidation/Aza-Wittig Condensation Sequence
作者:Vankudoth Jayaram、Tailor Sridhar、Gangavaram V. M. Sharma、Fabienne Berrée、Bertrand Carboni
DOI:10.1021/acs.joc.7b02831
日期:2018.1.19
An efficient and straightforward synthesis of isoquinolines is reported from internal alkenyl boronic esters, easily prepared from the corresponding 1,2-bis(boronates), via a sequential copper-catalyzed azidation/aza-Wittig condensation. This synthetic method has been used to synthesize quinisocaine, a topical anesthetic used for the treatment of pain and pruritus, and further extended to thieno[2
据报道,内部的烯基硼酸酯可以通过连续的铜催化的叠氮化/氮杂-维蒂希缩合反应,由相应的1,2-双(硼酸酯)轻松制备,从而可以高效,直接地合成异喹啉。该合成方法已用于合成奎尼卡因,奎尼卡因是一种用于治疗疼痛和瘙痒的局部麻醉剂,并在第一步中通过使用2-噻吩甲醛作为偶联伙伴进一步扩展为噻吩并[2,3- c ]吡啶。
Base-catalyzed diborylation of alkynes: synthesis and applications of cis-1,2-bis(boryl)alkenes
作者:Zhijie Kuang、Guoliang Gao、Qiuling Song
DOI:10.1007/s11426-018-9344-4
日期:2019.1
An efficient, transition-metal free, and practical approach to cis-bis(boryl)alkenes from various alkynes was disclosed in the presence of a catalytic amount of K2CO3 under mild conditions. Meanwhile, tetrasubstituted alkenes and phenanthrene derivatives were readily constructed from the target diborylalkenes via Suzuki-Miyaura cross coupling.
公开了在温和条件下在催化量的K 2 CO 3存在下从各种炔烃制得的有效,无过渡金属且实用的方法来从各种炔烃中制备顺式-双(硼基)烯烃。同时,通过铃木-宫浦(Suzuki-Miyaura)交叉偶合容易地由目标二硼烷基烯烃构建四取代的烯烃和菲衍生物。
A Novel and Efficient Approach to (<i>Z</i>)-1,2-Bis(benzodithienyl)ethene Precursors of Tetrathia[7]helicenes
A new and efficient method for the 'one-step' synthesis of (Z)-1,2-bis(benzodithienyl)ethenes has been set up using double Suzuki coupling between stereochemically defined diboronic acid esters and 2-iodo-benzodithiophene. The new Z-alkenes thus obtained can be easily and efficiently photochemically cyclised to the newly substituted tetrathia[7]helicenes.
E)-buta-1,3-dienes and (E)-but-1-en-3-ynes has been developed. The one-pot ruthenium-catalyzedsilylativecoupling/iododesilylation sequence provides (E)-N-(2-iodovinyl)phthalimide 1, which undergoes palladium-catalyzed Suzuki–Miyaura or Sonogashira cross-coupling to afford stereodefined highly π-conjugated phthalimides and functionalized dienimides containing phthalimide groups.
Copper-Mediated Synthesis of (<i>E</i>)-1-Azido and (<i>Z</i>)-1,2-Diazido Alkenes from 1-Alkene-1,2-diboronic Esters: An Approach to Mono- and 1,2-Di-(1,2,3-Triazolyl)-Alkenes and Fused Bis-(1,2,3-Triazolo)-Pyrazines
作者:Maruti Mali、Vankudoth Jayaram、Gangavaram V. M. Sharma、Subhash Ghosh、Fabienne Berrée、Vincent Dorcet、Bertrand Carboni
DOI:10.1021/acs.joc.0c01980
日期:2020.12.4
A stereoselective and convenient route has been demonstrated to access (Z)-1,2-diazido alkenes from the corresponding 1,2-diboronic esters via a copper-mediated reaction with sodium azide. Alternately, mono-functionalization was regioselectively carried out with trimethylsilyl azide as an azidation reactant. The in situ conversion of bis-azides to the corresponding bis-triazoles can be readily achieved