gem-Dinitro compounds in organic synthesis. 2. Synthesis of 4-nitropyrazoles from dinitromethane and its derivatives
摘要:
A series of 4-nitropyrazoles was synthesized from dinitromethane and other gemdinitro derivatives. New cyclization reactions of aliphatic azines with dinitromethane and an intramolecular cyclization of dinitroacetazines have been discovered, with which 4-nitropyrazoles substituted at the 3- and 5-positions of the pyrazole ring can be obtained in one stage.
gem-Dinitro compounds in organic synthesis. 1. Synthesis of functionally substituted polynitro compounds with the use of the universal synthon, ethyl dinitroacetate
摘要:
Ethyl nitroacetate (I) was used as a synthon in the preparation of dinitromethane, dinitroacetic acid, 2,2-dinitroethanol, fluorodinitromethane, 1,1,3,3-tetranitropropane, and some condensation products of Henry and Mannich reactions. A number of dinitroacetaldehyde derivatives were also prepared: its potassium salt, oxime, and hydrazone, dinitroacetaldehyde azine; and mixed azines with other acetaldehydes.