4- Dimethylamino-l-methyl

The first report of cycloaddition reactions of 3-dimethylamino-1 -methyl-1,2,4-triazinium-5-olates (71) with DMAD shows that 4-dimethylamino-l-methyl -6-oxo-l,3a,6,6a-tetrahydro-pyrrolo[3,4-c]pyrazole-3,3a-dicarboxylate derivatives (72) are obtained in each case [95AJC1175]. 

Pyrazol 1 -Ethyl-3,5,5-trimethyl-4,5-dihydro- IV/ld, 262 Pyridin 4-Dimethylamino-l-methyl-... 

Imino-l -methyl-1,4-dihydropteildine 4-Imino-l, 6,7-trimethyl-l, 4-dihydiopteridine hydriodide l-Methyl-4-methylimino-l, 4-dihydropteridine 4-Dimethylamino-l -methyl-pteridinium iodide 1,6,7-Trimethyl-4-methyl-imino-1,4-dihydropteridme iodide... 

The carbopalladation is extended to homoallylic amines and sulfides[466. Treatment of 4-dimethylamino-l-butene (518) with diethyl malonate and Li2PdCl4 in THF at room temperature leads to the oily carbopalladated complex 519, hydrogenation of which affords diethyl 4-(dimethylamino) butylmalonate (520) in an overall yield of 91%. Similarly, isopropyl 3-butenyl sulfide (521) is carbopalladated with methyl cyclopentanonecarboxylate and Li2PdCl4. Reduction of the complex affords the alkylated keto ester 522 in 96% yield. Thus functionalization of alkenes is possible by this method. 

Dimethylamino-l,2-benzenediamine (225) gave a separable mixture of 7-dimethylamino- (226) and 6-dimethylamino-3-methyl-2(l//)-quinoxalL-none (227) (AcC02Et, EtOH, reflux, N2, 4 h 70% and 25%, respectively). ... 

Feng (1987) monitored the persistence and degradation of hexazinone in a silt loam soil 104 d after treatment of the herbicide. After 104 d, 66% of the hexazinone degraded via hydroxylation to form the major metabolite 3-(4-hydroxycyclohexyl)-6-(dimethylamino)-l-methyl-s-triazine-2,4(l//,3//)dione (30-50% yield). A minor metabolite, 3-cyclohexyl-6-(methylamino)-1-methyl-s-triazine-2,4(1//,3//)-dione, forming via demethylation, accounted for only 0-12% of the applied herbicide. Hexazinone and its metabolites were not detected in soils at depths of 15-30 cm. 

If the quaternary nitrogen is a member of a ring, the ring is cleaved. 3-Benzyl-2-phenyl-A, A -dimethylpyrrolidinium chloride was cleaved by hydrogenation over Raney nickel at 20-25° almost quantitatively to 2-benzyl-4-dimethylamino-l-phenylbutane [722]. Reduction of methylpyridinium iodide (and its methyl homologs) with sodium aluminum hydride gave 24-89% yields of 5-methylamino-l,3-pentadiene (and its methyl homologs) in addition to A -methyl dihydro- and tetrahydropyridine [448]. 

Chlorotetracycline Chlorotetracyline, 7-chloro-4-dimethylamino-l,4,4a,5,5a,6,ll,12a-oxtahydro-3,6,10,12,12a-pentahydroxy-6-methyl-1,11 -dioxo-2-naphthacencarboxamide (32.3.1), is obtained biosynthetically as a result of the activity of a miCTOorganism, the actin-omycete S. aureofaciens [196-201]. 

Demeclocycline Demeclocycline, 7-chloro-4-dimethylamino-l, 4,4a,5,5a,6,11,12a-octahy-dro-3,6,10,12,12a-pentahdroxy-l,ll-dioxo-2-napthacencarboxamide (32.3.4), is prodnced by a mntant strain of S. aureofaciens, in which the mechanism of transferring methyl gronps is disrapted, and thus demeclocycline or demethylchlorotetracycline differs from chlorotetracycline, oxytetracycline, and tetracycline in the absence of a methyl gronp at Cg of the hydronaphthacene system. As a result, an antibiotic is synthesized that is more resistant to acids and bases in comparison with the methyl homologs [215-221]. 

The diastereoselective cycloaddition of 2-phenyl-4-dimethylamino-l-thia-3-azabuta-l,3-diene with a choice of dienophiles and in the presence of a Lewis acid provides a convenient route to 5,6-dihydro-4//-l,3-thiazines <2002TL6067, 2004T1827>. The more stable /ra r-adducts are produced exclusively. The approach using (4A)-3-acryloyl-4-benzyloxazolidin-2-one 198 provides access to the chiral 5,6-dihydro-4//-l,3-thiazine 199 <2004T1827>. The exceptional level of selectivity is only achieved when magnesium bromide is used. The chiral auxiliary was removed by reaction with lithium benzoxide to give the benzyl ester 200, and reaction with catalytic amount of samarium triflate and methanol provides the methyl ester 201 (Scheme 21). 2-Substituted-5,6-dihydro-l,3-thiazines are conveniently synthesized from nitriles or thiocyanates and 4-mercapto-2-methylbutan-2-ol to produce... 

Bei der Bestrahlung von 2,5-Bis-[dimethylamino]-l,4-benzochinon-bis-[benzolsulfonylimin] entsteht neben dem Photoreduktionsprodukt 2,5-Bis-[benzolsulfonylamino]-1,4-bis-[dimethyl-amino benzol (I 48% Schmp. 240-242°) durch Insertion und Eliminierung 6-Benzolsulfonyl-amino-5-dimethylamino-l-methyl-benzimidazo [II 44% Schmp. 163-164° (Pikrat)]106 ... 

Beim Erhitzen von Arylaziden mit Nitroso-benzolen bilden sich Azoxyarene. Brauchbare Ausbeuten werden allerdings nur dann erzielt, wenn das Arylazid einen elektronenspen-denden Substituenten wie Methyl oder Methoxy in para-Stellung tragt. Die Art der Substitution am Nitroso-aren ist ebenfalls bedeutsam, die hochsten Ausbeuten werden mit 4-Dimethylamino-l-nitroso-benzol erzielt. Von den beiden moglichen Azoxy-isomeren... 

Unter ahnlichen Bedingungen lagert sich (2-Methyl-allyl)-trimethyl-ammonium-chlorid in 2-Methyl-4-dimethylamino-l-buten (93%) um2. 

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