Synthesis of 5-trichloromethyl-Δ4-1,2,4-oxadiazolines and their rearrangement into formamidine derivatives
摘要:
A series of 5-trichloro-Delta(4)-1,2,4-oxadiazolines have been synthesised by 1,3-dipolar cycloaddition of nitrones to trichloroacetonitrile. These oxadiazolines rearrange into formamidine derivatives, via ring opening and a 1,2-aryl shift from carbon to the adjacent amino nitrogen. Both cycloaddition and rearrangement are facilitated when electron deficient nitriles and electron rich nitrones are used. (C) 2008 Published by Elsevier Ltd.
Photosensitizedelectron-transferreactions of 3-aryl-2-methyloxaziridines gave mainly the corresponding benzaldehydes, whereas the isomeric nitrones gave imines as well as aldehydes. Deoxygenation of the nitrone occurred via the nitrone cation radical under the reaction conditions. An aryl substituent effect on the reaction and isomerizations of both cation radicals are also discussed.
Rh2(esp)2-Catalyzed Redox/Cycloaddition Cascade of Diazoacetoacetate Enones with N-Methyl Nitrones: Diastereoselective Synthesis of β-Lactams with Two Adjacent Chiral Centers
作者:Xichen Xu、Yingjun Zhao、Rujie Xu、Zhengqing Xu
DOI:10.1055/s-0040-1719883
日期:2022.5
employing Rh2(esp)2 as the catalyst, a reaction cascade operates by reducing an N-methyl nitrone to the corresponding N-methyl imine in the presence of a first molecule of the diazoacetoacetate enone. A second molecule of the diazoacetoacetate enone sensing a change in the reaction medium undergoes a Wolff rearrangement to afford a vinyl ketene. This vinyl ketene then reacts with the in situ generated
Synthesis of 5-trichloromethyl-Δ4-1,2,4-oxadiazolines and their rearrangement into formamidine derivatives
作者:Gabriele Wagner、Tim Garland
DOI:10.1016/j.tetlet.2008.04.012
日期:2008.5
A series of 5-trichloro-Delta(4)-1,2,4-oxadiazolines have been synthesised by 1,3-dipolar cycloaddition of nitrones to trichloroacetonitrile. These oxadiazolines rearrange into formamidine derivatives, via ring opening and a 1,2-aryl shift from carbon to the adjacent amino nitrogen. Both cycloaddition and rearrangement are facilitated when electron deficient nitriles and electron rich nitrones are used. (C) 2008 Published by Elsevier Ltd.
Acharjee, Nivedita; Banerji, Avijit; Banerjee, Manas, Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 2009, vol. 48, # 12, p. 1627 - 1637
作者:Acharjee, Nivedita、Banerji, Avijit、Banerjee, Manas、Das, Tapas K.
DOI:——
日期:——
Hassan, Azfar; Wazeer, Mohammed I. M.; Ali, Sk. Asrof, Journal of the Chemical Society. Perkin Transactions 2 (2001), 1998, # 2, p. 393 - 399
作者:Hassan, Azfar、Wazeer, Mohammed I. M.、Ali, Sk. Asrof