通过在温和条件下用 HI 和 DMSO 水溶液直接碘硫甲基化炔烃,开发了一种方便有效的 ( E )-2-iodo-3-(甲硫基)丙烯酸酯方法。这种新颖的协议证明了缺电子炔烃的独特双功能化,具有广泛的底物范围和出色的官能团耐受性。初步机理研究表明,先对炔烃进行二碘化,然后用原位产生的 DMS 进行亲核取代,导致形成 ( E )-2-iodo-3-(methylthio) 丙烯酸酯。
A New and Improved Synthesis of trans-1,2-Diiodoalkenes and Their Stereospecific and Highly Regioselective Trifluoromethylation
摘要:
Reaction of terminal alkynes with iodine in the presence of CuI (5%) in acetonitrile under reflux for several hours gave the trans-1,2-diiodoalkenes in high yields. The trifluoromethylation of these diiodides using FSO2CF2CO2Me/CuI/DMF proceeded in excellent yields in a stereospecific and highly regioselective manner.
Palladium-Catalyzed Cross-Coupling Reactions of 1,2-Diiodoalkenes with Terminal Alkynes: Selective Synthesis of Unsymmetrical Buta-1,3-diynes and 2-Ethynylbenzofurans
for the preparation of unsymmetricalbuta-1,3-diynes and 2-ethynylbenzofurans. In the presence of palladium(II)acetate and copper(I) iodide, unsymmetrical buta-1,3-diynes wereselectively obtained in moderate to good yields. Moreover, 2-ethynylbenzofuranswere obtained in one pot from the reaction of 2-ethynylphenol with( E)-1,2-diiodoalkenes, palladium(II)acetate, and copper(I) iodide by simple heating
Palladium(II)-catalyzed cyclization of heterocyclic ketene aminals with (E)-ethyl 2,3-diiodoacrylates: selective synthesis of bicyclic pyrroles and bicyclic pyridones
作者:Ling Hu、Kai-Min Wang、Min Zhao、Xin-Rong Lin、Hong-You Zhu、Sheng-Jiao Yan、Jun Lin
DOI:10.1016/j.tet.2014.05.032
日期:2014.7
DOAD, GURINDER J. S.;AUSTIN, DAVID J.;OWEN, TERENCE C., J. CHEM. RES. (S),(1989) N0, C. 31-34
作者:DOAD, GURINDER J. S.、AUSTIN, DAVID J.、OWEN, TERENCE C.