'Push-pull' enynes 14a-d with EtO, PhO, PhS, and MeS groups as pi-donors have been synthesized by catalyzed coupling of stannyl ynamines 10 with 3-iodoprop-2-enal (Scheme 4).
The reactions of several gem- and vic-polychloroethanes containing 3–5 Cl atoms with PhONa in dimethyl sulfoxide and with PhSNa in N,N-dimethylformamide were examined. Either the mono-, di-, or tetra-substituted compounds of polychloroethylenes were obtained as the main products, depending on the kinds of substrates as well as on the amounts of the bases. The reaction products from polychloroethylenes
IMPROVED SELECTIVE SYNTHESIS OF (<i>Z</i>)- AND (<i>E</i>)-1,2-BIS(PHENYLSULFONYL)-CHLOROETHYLENE
作者:Sergio Cossu、Ottorino De Lucchi、Paola Peluso、Raffaella Volpicelli
DOI:10.1081/scc-100000175
日期:2001.1
The preparation of the title compounds (Z)- and (E)-1, which are synthetic substitutes for the unstable bis(phenylsulfonyl) acetylene and key reagents for the asymmetric preparation of polycyclic ketones, has been revisited and improved. Starting from inexpensive materials such as trichloroethylene, thiophenol, and hydrogen peroxide, (Z)- and (E)-1 are selectively obtained in multigram quantity in
Reactions of thioalkynes with diarylketenes <i>via</i> [3+2]-annulation <i>versus</i> benzannulation using Au and P(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub> catalysts
作者:Sayaji Arjun More、Vikas Ashokrao Sadaphal、Tung-Chun Kuo、Mu-Jeng Cheng、Rai-Shung Liu
DOI:10.1039/d2cc03613d
日期:——
Two catalytic annulations of non-symmetric diarylketenes with thioalkynes are described using gold and phosphine catalysts respectively.
使用金催化剂和膦催化剂,描述了非对称二芳基卡宾与硫代炔的两种催化环化反应。
Oxidative [3 + 2] cycloaddition of triazenes and trisubstituted dichloroalkenes
this study, an oxidative [3 + 2] cycloaddition of triazenes and trisubstituted dichloroalkenes was developed. The reaction proceeded under mild conditions to afford functionalized chloro-1-1,2,3-triazolium salts. The reaction was successfully performed on a gram scale. Moreover, a chloro-1-1,2,3-triazolium salt could be employed for nucleophilicaromaticsubstitution with various nucleophiles.