5272-36-6Relevant articles and documents
Synthesis of cyclic polyelectrolyte via direct copper(I)-catalyzed click cyclization
Chen, Fenggui,Liu, Guangming,Zhang, Guangzhao
, p. 831 - 835 (2012)
Well-defined cyclic poly(acrylic acid) (PAA) has been successfully prepared based on the direct click cyclization. The linear poly(tert-butyl acrylate) (PtBA) with azide and TMS-protected alkyne group forms cyclic chain directly by the copper(I)-catalyzed click cyclization without any deprotection steps. Cyclic PAA is synthesized by the hydrolysis of cyclic PtBA. The present synthetic strategy provides a simple and efficient method to synthesize cyclic polyelectrolyte and can be applied to other polymer systems. Copyright
Silver-catalyzed heterocyclization: First total synthesis of the naturally occurring cis 2-hexadecyl-3-hydroxy-4-methylene butyrolactone
Dalla,Pale
, p. 3525 - 3528 (1994)
The title compound was obtained in 4 steps with an overall yield of 64% with the silver-catalyzed cyclization of the corresponding substituted β-hydroxy-γ-acetylenic acid as the key step.
Silicon-directed decarbonylation of trimethylsilyl β,γ-enals by photolysis
Hwu,Furth
, p. 8834 - 8841 (1989)
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Ni-catalyzed direct carboxylation of propargylic alcohols with carbon dioxide
Yamahira, Tatsuya,Onodera, Gen,Fukuda, Tsutomu,Kimura, Masanari
supporting information, p. 853 - 855 (2021/05/19)
The carboxylation of propargylic alcohols containing a silyl group at the terminal position was conducted in a CO2 atmosphere at atmospheric pressure in the presence of a nickel catalyst and diethylzinc. Here, CO2 was used as not only the C1 source but also the promoter of the COH cleavage processes for the oxidative addition of propargylic alcohols.
Low-valent dialkoxytitanium(ii): a useful tool for the synthesis of functionalized seven-membered ring compounds
Bodinier, Florent,Sanogo, Youssouf,Ardisson, Janick,Lannou, Marie-Isabelle,Sorin, Geoffroy
supporting information, p. 3603 - 3606 (2021/04/14)
Herein, we describe unprecedented access to all-carbon or heterocyclic seven-membered ring frameworks from 1,8-ene-ynes promoted by inexpensive low-valent titanium(ii) species, readily available from Ti(OiPr)4and Grignard reagent. A broad range of cycloheptane, azepane or oxepane derivatives has been obtained (19 examples) with moderate to good yields and an excellent selectivity (up to 95/5 d.r.).
Iron-Catalyzed [2+2+2] Annulation of Aliphatic Bridged 1,n-Enynes with Aldehydes for the Synthesis of Fused Pyrans
Tian, Tian,Wang, Xin,Lv, Leiyang,Li, Zhiping
supporting information, p. 4425 - 4428 (2020/06/05)
An iron-catalyzed [2+2+2] annulation of aliphatic bridged 1,n-enynes with aldehydes was developed. Aldehydes play a dual role as the precursors of acyl radicals to trigger the cascade cyclization but also as the radical acceptors to terminate the annulation. This two-in-one strategy overcomes the limitation in [2+2+m] cyclization that requires a rigid benzene skeleton as the essential linker, thus enabling the efficient synthesis of functionalized fused [5.6] and [6.6] pyran skeletons.
