Pyrrole 2.3- dihydro-1-methoxycarbonyl

H-Pyrrol 3 -Methoxycarbonyl-5-phenyl-3,4-dihydro- E14b, 22 (Azirin 4- En)... 

Ring contraction with desulfurization occurs when the 4//-l,3-thiazines 131 are reacted with potassium /-butoxide (Scheme 7) <2004TL5913>. The bis(methoxycarbonyl)pyrroles 132 are not isolated but instead give the 4-oxo, 5 dihydro-2//-pyrrolo[3,4-c]quinolines 133 and 134. 

H-Pyrrol 2-(2-Methoxycarbonyl-ethyl)-5-[(2-methyl-l,3-dioxolan-2-yl)-methyl]-4,5-dihydro- -1-oxid E14b, 1472 (aus Nitro-keton)... 

Benzoyl-l-phenyl-5-methoxycarbonyl-2,3-dihydro-pyrrole-2,3-dione was reacted with 5/5-dimethyl-3-p-methoxyphenylamino-2-cyclohexen-l-one in boiling benzene to afford 6,6-d imethyl-1 -p-methoxyphenyl-2,4-dioxo-2,3,4,5,6,7-hexahydro-lH-indole-3-spiro-2-(3-benzoyl-5-oxo-4-phenyl-amino-2,5-dihydrofuran) in high yield. The reaction proceeded by the enamine addition to the 2-carbonyl group with ring opening, followed by double cyclization (06RJOC772). 

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