Aldehyde derivativesAldehyde derivatives Q 0340 1,3-Dipolar Cycloadditions. Part 8. Microwave Irradiation Assisted Synthesis of N-Methyl-C-aryl Nitrones. -The title reaction is described as method of choice for the synthesis of N-methyl-C-arylnitrones (III). -(BANERJI*, A.; BISWAS, P. K.; SENGUPTA, P.; DASGUPTA, S.; GUPTA, M.; Indian J. Chem., Sect. B: Org. Chem. Incl. Med. Chem. 43 (2004) 4, 880-881; Cent. Adv. Stud. Nat. Prod., Univ. Coll. Sci.,
Cycloadditions of C,N‐diarylnitrones to β‐nitrostyrenes occurred to yield two diastereoisomeric cycloadducts, the 3,4‐trans‐4,5‐trans substituted isoxazolidine derivatives being formed selectively as the major products. These were characterised by spectroscopic and X‐ray data. Conformational studies were carried out by X‐ray crystallography and Molecular Modelling.
Investigation of cycloadditions of C‐aryl‐N‐(4‐chlorophenyl)nitrones to N‐cinnamoyl piperidines was carried out. Two diastereoisomeric and one regioisomeric cycloadducts, and in some cases ring‐opened compounds were characterized by spectroscopic and X‐ray data. Molecular modelling was carried out for conformational studies.
Isoxazole derivatives R 0240 1,3-Dipolar Cycloadditions. Part 12. Selective Cycloaddition Route to 4-Nitroisoxazolidine Ring Systems. -Two diastereoisomeric adducts are obtained in the cycloaddition reaction of C,N-diarylnitrones to β-nitrostyrenes. The isoxazolidine derivatives (III) are selectively formed as the major products. -(BANERJI*, A.; GUPTA, M.; BISWAS, P. K.; PRANGE, T.; NEUMAN, A.; J. Heterocycl. Chem. 44 (2007) 5, 1045-1049; Cent. Adv. Stud. Nat. Prod., Univ. Coll. Sci., Calcutta 700 009, India; Eng.) -H. Toeppel 04-131
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