[GRAPHICS]Easily synthesized aldoximes have been converted to the corresponding nitriles under very mild conditions by a simple reaction with 1H-benzotriazol-1-yloxytris(dimethylamino)phosphonium hexafluorophosphate (BOP) and DBU in CH2Cl2, THF, or DMF. As an alternative reagent that eliminates the formation of hexamethylphosphoramide as a byproduct, use of 1H-benzotriazol-1-yl-4-methylbenzenesulfonate (Bt-OTs) and DBU was investigated. Reactions with this reagent also proceeded smoothly and in good yields, although in one case N-sulfonylation was observed. An attempt to gain mechanistic insight into the BOP-mediated reaction has been made using (31)p{H-1} NMR. However, no phosphorus-bearing intermediate could be readily observed. Finally, the method has been applied to the synthesis of an antiviral 4'-cyano adenosine analogue from a commercial precursor using a single saccharide protecting group.
X=Y–ZH Systems as potential 1,3-dipoles. Part 53: Sequential nucleophilic ring opening-1,3-dipolar cycloaddition reactions of Z-oxime anions with aziridines and dipolarophiles
作者:H Ali Dondas、Jonathan E Cummins、Ronald Grigg、Mark Thornton-Pett
DOI:10.1016/s0040-4020(01)00767-0
日期:2001.9
Nucleophilic ring opening of aziridines involving attack of the nitrogen atom of Z-oxime anions generates nitrones which are then trapped in 1,3-dipolar cycloaddition reactions with N-methylmaleimide to afford 1:1 mixture of endo- and exo-cycloadducts.
A Facile Steroselective Synthesis of Z-Aldoximes from Benzaldehyde and Hydroxlaminehydrochloride in Dry Media
作者:SHARWAN K. DEWAN、MEENAKSHI MEENAKSHI
DOI:10.13005/ojc/280360
日期:2012.9.18
The synthesis of Z-arylaldoximes has been carried out under microwave conditions using CdSO4 as catalyst. The yields obtained were in the range 84-88%.
Z-芳基醛肟的合成是在微波条件下使用CdSO4作为催化剂进行的。获得的产率在84-88%的范围内。
Brady; Dunn; Goldstein, Journal of the Chemical Society, 1926, p. 2394
作者:Brady、Dunn、Goldstein
DOI:——
日期:——
Brady; McHugh, Journal of the Chemical Society, 1925, vol. 127, p. 2421
作者:Brady、McHugh
DOI:——
日期:——
Brady; Klein, Journal of the Chemical Society, 1925, vol. 127, p. 846