A General Protocol for C−H Difluoromethylation of Carbon Acids with TMSCF
<sub>2</sub>
Br
作者:Qiqiang Xie、Ziyue Zhu、Lingchun Li、Chuanfa Ni、Jinbo Hu
DOI:10.1002/anie.201900763
日期:2019.5.6
efficient method for the selectiveC‐difluoromethylation of carbon acids with the reagent TMSCF2Br has been developed. A variety of structurally diverse sp3‐ and sp‐hybridized carbon nucleophiles, including esters, amides, fluorenes, terminal alkynes, β‐ketoesters, malonates, and other activated C−H nucleophiles, could be efficiently and selectively transformed into the corresponding C‐difluoromethylated
4-Alkylphenyl 2-chloro-4-(4-vinylbenzoyloxy) benzoates and 2-phenyl-1,3-dioxane derivatives with terminal vinyl groups were synthesized. Most of the novel compounds obtained possess characteristic mesomorphic ranges.
A process for producing a macromolecular monomer, which comprises anionic polymerization of a (meth)acrylic acid ester monomer by using, as a polymerization initiator, a compound represented by the following general formula [I]: ##STR1## wherein M.sup.+ is a quaternary ammonium ion; .phi.is a phenylene group; R.sub.1 and R.sub.2 are each an electron withdrawing group stabilizing the carbanion C.sup.-, or one of them is said electron withdrawing group and the other is an alkyl group of 1-6 carbon atoms or a phenyl group; and n is an integer of 0-6.
1,3-Dithiane polymers for the supported synthesis of ketones
作者:Vincenzo Bertini、Francesco Lucchesini、Marco Pocci、Angela De Munno
DOI:10.1016/s0040-4039(98)02081-4
日期:1998.12
The synthesis of polymeric reagents containing an odourless propane-1,3-dithiol functionality is reported. Their usefulness for the solid phase synthesis of ketones via the umpoled alkylation of 1,3-dithianes is demonstrated. (C) 1998 Elsevier Science Ltd. All rights reserved.