5- Ethoxy-3.4-dihydro-277-pyrrole

The pyrrolotriazines 32 were prepared from 3,4-dihydro-5-ethoxy-2//-pyrrole 31 by sequential reaction with hydrazine hydrate and a-oxoesters (85GEP3340026). They are useful as selective herbicides (Scheme 10). 

Isonitriles react with alkenylcarbene complexes to form initially at 0 °C a 3-ethoxy-3-styrylketeneimine complex, which on warming to room temperature leads to the formation of a cyclic 3-ethoxy-2,5-dihydro-2-pyrrolylidene complex. Finally, on heating to 100 °C a pyrrole derivative is produced [80] (Scheme 33). 

Ethoxypyrrolin-5-one l-Pyrrolin-5-one, 2-ethoxy- (8) 2H-Pyrrol-2-one, 5-ethoxy-3,4-dihydro- (9) (29473-56-1) tert-Butyl N-(l-ethoxycyclopropyl)carbamate Cyclopropanecar-bamic acid, 1-ethoxy-, tert-butyl ester (8) Carbamic acid, (1-ethoxycyclopropyl)-, 1,1-dimethylethyl ester (9) (28750-48-3 41879-49-6)... 

Acidic hydrolysis or methanolysis of 5-(l-ethoxyethoxy)-l//-pyrroles 1403, assembled from lithiated l-(l-ethoxy-ethoxy)-2-heptyne 1402 and isothiocyanates in one-pot (Scheme 269), leads to 2-hydroxypyrroles 1404 that, unlike the 3-hydroxy-2-(alkylsulfanyl)-l//-pyrroles 1400, exist exclusively in the form of the tautomeric l,5-dihydro-2//-pyrrol-2-ones 1405 (IR and NMR data). An unprecedented inertness of W-(2-vinyloxy)ethyl group under conditions of acidic hydrolysis (dioxane/H20, HCl, 0°C, 5min) was revealed <2002RJ0907>. 

Pentan 3-Aminomethylen-2,4-dioxo-1-ethoxy- XI/1. 199 4H-Pyran 6-(Ethoxycarbonyl-amino)-5,6-dihydro- Vl/4, 363 3H-Pyrrol... 

Pyrrol 2-Amino-3-cyan-l-ethoxy-carbonyl-5-methyl-4,5-dihydro-E15/2,1948 (NC- CH2-CN +... 

Amidines 9 with an appropriate ortho-carbonyl substituent, which are obtained from the respective ortho-carbonyl aniline derivatives and 0-ethyl succinimide (5-ethoxy-4,5-dihydro-3//-pyrrol-2-one), are cyclized with sodium in alcohol to quinazolin-4(3// )-ones 10a and quinazolines 10b with a 2-[(alkoxycarbonyl)ethyl] substituent at C2. The reaction can also be carried out starting from anthranilates or 2-aminophenyl ketones as a simple one-pot synthesis. ... 

Photolysis of 5-ethoxy-3,4-dihydro-2/f-pyrrol-2-one led to a ring contraction and formation of an isocyanate, and in t rr-butyl alcohol this was trapped as tert-butyl A-(l-ethoxycyclo-propyl)carbamate (15) in 70% yield. ... 

A representative of this type of compounds, 6,7-dihydro-57/-pyrrolo[l,2-a]purine-9-amine (3), was accessible by heating 5-amino-imidazole-4-carbonitrile (1) with 5-ethoxy-3,4-dihydro-2//-pyrrole (2) (88JCS(P 1)593). Compound 3 shows a phytohormone effect greater than that of benzyladenine (89JAP(K)1) (Scheme 1). 

Irradiation of a benzene solution of 4-ethoxy-2,5-dihydro-lH-pyrrole-2-thione (17) and electron-rich alkenes gives 2-(mercaptoalkyl)pyrroles (18), which are alkylated with methyl iodide to give (19). 

Et ether [931-46-4]. 5-Ethoxy-3,4-dihydro-2H-pyrrole, 9CL 2-Ethoxy- 1-pyrroline C HiiNO M 113.159 Liq. Bp 133-137°. 

Ethoxy-3,4-dihydro-2//-pyrrole, in P-00443 4-Methyl-3-penten-2-one Oxime, in M-00219... 

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