Process of preparing 2-nitroalkylamines, preferably in the form of salts. Soroka, Miroslaw; Siwek, Andrzej. (Politechnika
Wroclawska, Pol.). Pol. (2005), 6 pp. CODEN: POXXA7 PL 188456 B1 20050228 Patent written in Polish. Application: PL 98-324914
19980217. Priority: . CAN 144:128653 AN 2006:110575 CAPLUS
Patent Family Information
Patent No. Kind Date Application No. Date
PL 188456 B1 20050228 PL 1998-324914 19980217
Priority Application
PL 1998-324914 19980217
Abstract
The title compds. H2NCH2C(R1)(R2)NO2 [R1, R2 = H, alkyl] or preferably its salts H3N+CH2C(R1)(R2)NO2X- [I; R1, R2 = H, alkyl; X = chloride, sulfate,
perchlorate, etc.] were prepd. by reacting N-(triarylmethyl)-1-amino-2-nitroalkane A3CNHCH2C(R1)(R2)NO2 [II; R1, R2 as above; A = aryl, preferably Ph]
with hydrochloride acid or other inorg. acid in preferably org. solvent at 250-400K. Aq. solns. of I were also prepd. by acidolysis of II with
hydrochloride acid or other inorg. acid in H2O at 250-400K. Thus, treating N-(triphenylmethyl)-1-amino-2-nitroethane with dry hydrogen chloride in
Et2O at 273-310K afforded 100% 2-nitroethylamine hydrochloride.
Aliphatic nitro compounds. VII. Preparation of 2-nitroalkylamines. Heath, Royden L.; Rose, J. D. Imperial Chem. Industries
Ltd., Manchester, UK. Journal of the Chemical Society (1947), 1486-9. CODEN: JCSOA9 ISSN: 0368-1769. Journal language unavailable.
CAN 42:23078 AN 1948:23078 CAPLUS
Abstract
NH3 and primary or secondary amines interact with a-nitro olefins to give 2-nitroalkylamines. Those formed from NH3 or aliph. amines are in general
extremely unstable but can be reduced over Raney Ni to derivs. of (CH2NH2)2. N-(2-Nitroalkyl)arylamines from arom. amines are somewhat more stable
but are best isolated and characterized as their salts. In many cases O2NCH2CH2NO3 (I) can be used as a convenient lab. substitute for O2NCH:CH2 and
Me(O2NCH2)CHOAc (II) or Me(O2NCH2)CHNO3 (III) can replace MeCH:CHNO2 (IV). I (13.6 g.), added dropwise to 20 cc. MeOH satd. with dry NH3 at -5 and
the mixt. stirred 4 h. at -5 to 0, gives 9 g. crude O2NCH2CH2NH2, which forms a black tar in 1-2 h. and does not yield cryst. salts but on redn. in
MeOH gives (CH2NH2)2. IV and MeOH-NH3, stirred 3 h. at 0, give 55% 2-nitroisopropylamine, b10 50-5, decomp. within 24 h. (HCl salt, m. 114); redn.
yields 52% MeCH(NH2)CH2NH2. III (30 g.) in 200 cc. dry ether, treated 1 h. with NH3, gives 12.7 g. bis(2-nitroisopropyl)amine, b0.5 60-2.
MeCH:C(NO2)Me and MeOH-NH3, stirred 2 h. at 0, give 60% 2-nitro-3-aminobutane, b20 75-8, n18D 1.4720, decomp. in 2 days (HCl salt, m. 115 (decompn.),
also unstable); redn. gives 40% [MeCH(NH2)]2. Me2C:CHNO2 in C6H6 gives 40% 1-nitro-2-amino-2-methylpropane, b11 62.5, decomp. in 3-4 days (HCl salt,
m. 182 (decompn.)); redn. gives 75% Me2C(NH2)CH2NH2. I (6.8 g.), added to 7.3 g. Et2NH in 100 cc. ether at 0, gives diethyl(2-nitroethyl)amine, which
could not be distd. at 15 mm. (violent decompn.); HCl salt, m. 72-5; picrate, m. 88. MeCH:C(NO2)Me gives 65% 2-nitro-3-diethylaminobutane, b11, 90-5,
begins to decomp. in 12 h. (picrolonate, m. 267 (decompn.)). I (5.9 g.), added dropwise to 11.8 g. tetrahydroquinoline at a temp. below 30, the mixt.
stirred 1 h., dissolved in 50 cc. ether, and treated with ether-HCl, gives 75% N-(2-nitroethyl)-1,2,3,4-tetrahydroquinoline-HCl, m. 132; CH2:CHNO2
gives 12.5%. I (27.2 g.), added dropwise to 37.2 g. PhNH2 in 250 cc. ether at room temp.
and stirred 2 h., gives 65% PhNHCH2CH2NO2, m. 37; HCl salt, m. 109; Ac deriv., m. 99; with CH2:CHNO2 this yields 50% %Ngr;,N-bis(2-nitroethyl)aniline,
m. 64 (HCl salt, m. 128). PhNHMe and CH2:CHNO2 give 50% N-methyl-N-(2-nitroethyl)aniline, b0.2 110 (HCl salt, m. 82).
N-Ethyl-N-(2-nitroethyl)aniline, pale green oil, b0.1 108, n19D 1.5597; HCl salt, m. 114, 70%; picrate, m. 106; CH2:CHNO2 gives 75% of the HCl salt.
N-(2-Nitroisopropyl)aniline, yellow, m. 33. MeCH:CHNO2 (43 g.), treated dropwise with 53.5 g. PhNHMe at a temp. below 30 and the crude product in 500
cc. ether added to 500 cc. ether contg. 20 g. HCl, gives 92% of the HCl salt, m. 126, of N-methyl-N-(2-nitroisopropyl)aniline, pale green oil, b0.5
112-15; picrate, m. 116; perchlorate, m. 116; HCl salt of p-NO deriv., dark green, decomp. 160; II gives 50% of the HCl salt.
N-Ethyl-N-(2-nitroisopropyl)aniline-HCl, m. 123, 90%. N-Ethyl-N-(2-nitropropyl)aniline-HCl, m. 126, 50%. N-(2-Nitro-1-methylpropyl)aniline, b0.5 86,
n17D 1.5570, 72%; HCl salt, m. 122; perchlorate, explodes on warming. |