3篇
您的检索式：作者名="Dachang Bai"
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| 1 | Catalytic[3+3]Annulation ofβ-Ketoethers and Cyclopropenones via C(sp^(3))-O/C-C Bond Cleavage under Transition-Metal Free Conditions显示文摘Main observation and conclusion The efficient cleavage of carbon-oxygen(C—O)bond is highly important for the transformation of oxygen-rich biomass and industry chemicals.Herein,an efficient[3+3]annulation ofβ-ketoethers with cyclopropenones in the presence of catalytic base has been developed,which proceeds through the C(sp^(3))—O bonds cleavage inβ-ketoethers and C—C bond cleavage in cyclopropenones under transition-metal free conditions.The cleavage of C(sp^(3))—O bonds in alkyl alkyl ethers and aryl alkyl ethers was realized.The reaction featured excellent functional group compatibility and chemoselectivity,affording various 2-pyrones in good to excellent yields under mild conditions and simple operation. | Dachang Bai Junyan Chen Bingbing Zheng Xueyan Li Junbiao Chang | 2021 | Chinese Journal of Chemistry2021，39，10： | 0 |
| 2 | Palladium-catalyzed multi components oxy-aminofluorination and aminofluorination of gem-difluoroalkenes显示文摘Organofluorine compounds are widely used in the realm of drug discovery and material science.Herein,we developed palladium catalyzed intermolecular aminofluorination and oxy-aminofluorination of gem‑difluoroalkenes with N-fluorobenzenesulfonimide(NFSI),in which NFSI was used as the nitrogen source and oxidant.The reaction provides an efficient and straightforward synthesis route of a series ofα-trifluoromethyl benzylic amines.Notably,three/four components oxy-aminofluorination processes were realized to giveα-trifluoromethyl benzylic ether with a terminal amino group,which proceed through C(sp^(3))-O bond cleavage of easily available ether and simultaneous introduced a fluorine,an amino and an oxy substituent in one pot with excellent regioselectivity.The divergent reactivity not only included the incorporation of one ether molecular,but also much more challenged two ether insertion with excellent selectivity through succession C(sp^(3))-O bonds cleavage.This protocol allows for concise synthesis of high value amines with fluoroalkyl-substituents and selectively transformation of easily available ethers by high-valent palladium catalysis. | Fen Wu Xin Li Junbiao Chang Dachang Bai | 2024 | Chinese Chemical Letters2024，35，2： | 0 |
| 3 | Diastereodivergent[4+2]annulation of biphenylenes with enones via nickel(0)-catalyzed C-C bond activation显示文摘Ni(0)-catalyzed regio-and diastereodivergent[4+2]annulation of biphenylenes withα,βunsaturated ketones is described.This solvent-controlled diastereodivergent reaction integrates C-C bond cleavage of biphenylene and C=C double bond insertion selectivity,offering a mild approach to all possible diastereoisomers of 9,10-dihydrophenanthrene derivatives from the same starting materials. | Junyan Chen Dachang Bai Xiuli Guo Yiyao Wang Xingwei Li | 2022 | Chinese Chemical Letters2022，33，12： | 0 |
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