Organic & Biomolecular Chemistry published new progress about 1869-22-3. 1869-22-3 belongs to chlorides-buliding-blocks, auxiliary class Trifluoromethyl,Fluoride,Chloride,Hydrazine,Amine,Benzene, name is 1-(2-Chloro-5-(trifluoromethyl)phenyl)hydrazine, and the molecular formula is C3H8N2S, Safety of 1-(2-Chloro-5-(trifluoromethyl)phenyl)hydrazine.
Smith, Catherine J. published the artcileFlow and batch mode focused microwave synthesis of 5-amino-4-cyanopyrazoles and their further conversion to 4-aminopyrazolopyrimidines, Safety of 1-(2-Chloro-5-(trifluoromethyl)phenyl)hydrazine, the publication is Organic & Biomolecular Chemistry (2007), 5(17), 2758-2761, database is CAplus and MEDLINE.
A flow apparatus for microwave irradiation is constructed; the apparatus is used for the reactions of (ethoxymethylene)malononitrile with hydrazines RNHNH2 (R = H, Me, Ph, 4-ClC6H4, 4-O2NC6H4, 2-F3CC6H4, 3-Cl-4-MeC6H3, 2,5-Cl2C6H3, 4-FC6H4, 4-MeOC6H4, 4-HO2CC6H4, 3-Cl-4-FC6H3, 2-Cl-5-F3CC6H3, 2-pyridinyl) under microwave irradiation to give aminopyrazolecarbonitriles I (R = H, Me, Ph, 4-ClC6H4, 4-O2NC6H4, 2-F3CC6H4, 3-Cl-4-MeC6H3, 2,5-Cl2C6H3, 4-FC6H4, 4-MeOC6H4, 4-HO2CC6H4, 3-Cl-4-FC6H3, 2-Cl-5-F3CC6H3, 2-pyridinyl) in 62-96% yields and in 90->95% purities (all but one in >95% purity). Microwave irradiation of hydrazines RNHNH2 (R = H, Me, Ph, 4-ClC6H4, 4-O2NC6H4, 2-F3CC6H4, 3-Cl-4-MeC6H3, 2,5-Cl2C6H3, 4-FC6H4, 4-MeOC6H4, 4-HO2CC6H4, 3-Cl-4-FC6H3, 2-Cl-5-F3CC6H3, 2-pyridinyl) with (ethoxymethylene)malononitrile using the described flow apparatus followed by flow of the mixture through a column of resin-bound benzylamine and a column of activated carbon provides I (R = H, Me, Ph, 4-ClC6H4, 4-O2NC6H4, 2-F3CC6H4, 3-Cl-4-MeC6H3, 2,5-Cl2C6H3, 4-FC6H4, 4-MeOC6H4, 4-HO2CC6H4, 3-Cl-4-FC6H3, 2-Cl-5-F3CC6H3, 2-pyridinyl) in 62-91% yields and >95% purities; I (R = 4-HO2CC6H4) could not be purified using the resin-bound benzylamine column and is isolated in 96% yield and 90% purity. This method is used to prepare >250 g of I (R = 4-HO2CC6H4). I (R = Me, Ph, 4-ClC6H4, 2-F3CC6H4, 3-Cl-4-MeC6H3, 2,5-Cl2C6H3, 4-FC6H4, 4-MeOC6H4, 2-Cl-5-F3CC6H3, 2-pyridinyl) undergo cyclocondensation and dimerization under microwave irradiation with potassium tert-butoxide in toluene at 160° to give the pyrazolylpyrazolopyrimidines II (R = Me, Ph, 4-ClC6H4, 2-F3CC6H4, 3-Cl-4-MeC6H3, 2,5-Cl2C6H3, 4-FC6H4, 4-MeOC6H4, 2-Cl-5-F3CC6H3, 2-pyridinyl) in 28-82% yields; the products are purified by stirring with Amberlyst 15 in DMF followed by stirring of the resin with triethylamine in DMF. I (R = H) reacts with nitriles R1CN (R1 = Ph, 3-BrC6H4, 2-pyridinyl) under microwave irradiation with potassium tert-butoxide in toluene at 160° to give pyrazolopyrimidines III (R1 = Ph, 3-BrC6H4, 2-pyridinyl) in 88-94% yields.
Organic & Biomolecular Chemistry published new progress about 1869-22-3. 1869-22-3 belongs to chlorides-buliding-blocks, auxiliary class Trifluoromethyl,Fluoride,Chloride,Hydrazine,Amine,Benzene, name is 1-(2-Chloro-5-(trifluoromethyl)phenyl)hydrazine, and the molecular formula is C3H8N2S, Safety of 1-(2-Chloro-5-(trifluoromethyl)phenyl)hydrazine.
Referemce:
https://en.wikipedia.org/wiki/Chloride,
Chlorides – an overview | ScienceDirect Topics