Syntheses of heterocyclic compounds. Part XVIII. Aminolysis of 3-aryl-4-bromosydnones, and acid hydrolysis of 3-arylsydnoneimines
作者:G. S. Puranik、H. Suschitzky
DOI:10.1039/j39670001006
日期:——
various 3-aryl- and 3-heteroaryl-4-bromosydnones with piperidine gives the corresponding piperidino-glycyl-piperidines. Fluorine labelling has confirmed the postulated course of fission induced by acids in 3-aryl-sydnoneimines.
The Efficient Synthesis of 3-Arylsydnones Under Neutral Conditions
作者:Jacqueline Applegate、Kenneth Turnbull
DOI:10.1055/s-1988-27791
日期:——
Various substituted aryl sydnones can be prepared in high yield under mild, neutral conditions by nitrosation of the appropriate aryl glycine with isoamyl nitrite in dimethoxyethane followed by cyclization with trifluoroacetic anhydride.
Design, docking studies and molecular iodine catalyzed synthesis of benzo[a]xanthen-one derivatives as hyaluronidase inhibitors
作者:Mahadev N. Kumbar、Ravindra R. Kamble、Atulkumar A. Kamble、Shrinivas D. Joshi、Sheshagiri R. Dixit、Joy Hoskeri
DOI:10.1007/s00044-016-1655-2
日期:2016.11
A series of novel benzo[a]xanthen-11(12H)-one derivatives 4a–m were designed and subjected to docking studies. The title compounds were synthesized from 3-aryl-4-formylsydnones 1a–m, β-naphthol and dimedone in presence of molecular iodine as a catalyst and evaluated for their in vitro inhibitory effects on the hyaluronidase.
设计了一系列新颖的苯并[ a ]黄体酮11(12 H)-一衍生物4a - m并进行了对接研究。由3-芳基-4-甲酰基sydnones 1a – m,β-萘酚和二甲酮在分子碘作为催化剂的条件下合成标题化合物,并对其在体外对透明质酸酶的抑制作用进行了评估。
Catalytic Activity of 1,3-Dibromo-5,5-dimethylhydantoin (DBH) in the One-Pot Transformation of<i>N</i>-Arylglycines to<i>N</i>-Arylsydnones in the Presence of NaNO<sub>2</sub>/Ac<sub>2</sub>O under Neutral Conditions: Subsequent Bromination of these Sydnones to their 4-Bromo Derivatives
作者:Davood Azarifar、Hassan Ghasemnejad-Bosra
DOI:10.1055/s-2006-926380
日期:——
1,3-Dibromo-5,5-dimethylhydantoin (DBH) has been found to efficiently catalyze the one-pot conversion of various N-arylglycines through N-nitrosation and cyclization to sydnones in combination with NaNO2 and Ac2O in high yields (80-94%) under mild and neutral conditions. Also, it was shown that DBH can conveniently promote the bromination of these sydnones to their 4-bromo substituted congeners in excellent yields in DMF at room temperature.