3- Diethylamino-5-methoxycarbonyl

Alkyl-2-(2-chlor-ethyl)- -2-oxid E2, 410 3-Alkyl-2-chlormethyl- -2-oxid E2, 410 3-Alky[-2-methyl- -2-oxid E2, 410 2-Butvloxy- -2-sulfid E2, 755 2-Butyl- -2-sulfid E2, 469 2-Chlor-3-methyl- -2-sulfid E2, 772 2-Diethylamino-4-oxo-3-phenyl- E2, 775 2-Diethylamino-4-oxo-3-phenyl- -2-sulfid.E2, 775 2-Ethoxy- -2-oxid E2, 629 2-Ethoxy- -2-sulfid E2, 755 2-Ethyl- -2-sulfid E2, 469 2-(Methoxycarbonyl-methylthio)-3-methyl- -2-sulfid E2, 772... 

Benzol l-(2-Diethylamino-ethoxy)-4-nitro- VI/3, 56 Hydrazin l,2-Dimethyl-2-[(E)-2-methoxycarbonyl-elhenyl]-l -(3-oxo-l-cyclohexenyl)- E15/1, 764 (In + tert.-Hydrazin)... 

Heating of l,4-dicyano-2,3-dinitroso-2,3-diphenylpiperazine ( ) (1572, cf. 1573) in mesitylene is claimed to give l,4-dicyano-2,3-diphenyl-1,4,5,6-tetrahydro-pyrazine (1572), and l-carbamoyl-3-hydroxy-2,3-diphenylpiperazine ( )(1572, cf. 1573) with methyl iodide and potassium carbonate in methanol is claimed to give 4-carbamoyl-l,l-dimethyl-2,3-diphenyl-l,4,5,6-tetrahydropyrazinium iodide (1572). 2-Diethylamino-l,4-dimethylpiperazine on thermal treatment gives 1,4-dimethyl-l,2,3,4-tetrahydropyrazine, which was methoxycarbonylated to 5-methoxycarbonyl-1,4-dimethyl-l, 2,3,4-tetrahydropyrazine (1593). 

Diethylamino-3-(fluorenylidene-methoxycarbonyl-methyl)-2-methoxy-4-phenyl- 2832, 2833... 

In another group of (2 + 2)-cycloaddition reactions, the heterocyclic nucleus reacts via an electron-deficient carbon-carbon or carbon-nitrogen double bond with electron-rich aminoacetylenes (ynamines). For instance, thiete 1,1-dioxides, JV-benzylmaleimide, and 2,3-bis(methoxycarbonyl)-7-oxabicyclo( 2.2.1 lhepta-2,5-diene reacted with 1-diethylamino-l-propyne and with 1 -phenyl-2-( 1 -pyrrolidinyl)-acetylene to give the (2 + 2)-cycloadducts 48, 49, and 50, respec-tively.35,37,53 The latter product was thermally rather unstable, and its structure was identified on the basis of its conversion with 2,4,6-tri-methylbenzonitrile oxide into 51.53 (2 + 2)-Cycloaddition via a carbon-nitrogen double bond has been reported to take place in the reactions of 3,3-dimethyl-3//-indoles and 3,4-dihydroisoquinoline with ynamines, e.g., l-dimethylamino-2-phenylacetylene, in the presence of boron trifluoride.54 The (2 + 2)-cycloadducts 52 and 53 were not isolated, but... 

CH2)5— H C2H5 c2h5 ZnCl2 dl-7- ( Diethylamino-methyl)-I-methoxycarbonyl-cyclohexan 90 118-121 6,5(0,87) 60... 

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