Pyrrolo triazine-2,4-diones

The structures of several compounds containing the pyrrolo[l,2,4]triazine moiety have been established by X-ray crystallography, as for example pyrrolo[l,2- ][l,2,4]triazine 13 <1997J(P1)1829>, 4-acetyl-l-phenyl-2a,3,5-triaza-benz[r-,<7]azulene 14 <2000H(53)323>, heterodiquinane 15 <1998CL1135>, cation 16 derived from methylation of 3-phenylcyclohepta[4,5]pyrrolo[l,2- ][l,3,5]triazine-2,4(377)-dione <2005H(65)1629>, 2-phenyl-3-phenyl-... 

Reaction of /cr/-butyl 1-hydrazinecarboxylates with triphosgene and ethyl 2-pyrrolidinecarboxylate, followed by removal of the BOC-protecting group with gaseous hydrogen chloride in anhydrous acetic acid, yielded hexahydro-pyrrolo[l,2-rf][l,2,4]triazin-l,4-dione 79 (Scheme 9) <2003SC1011>. 

Cyclohepta[4,5)pyrrolo[l,2-fl]imidazoles, 2-aryl-, halogenation. 59, 283 Cyclohepta[4,5)pyrrolo[3,2-e][l,2,4]triazine, 3-chloro- 10-(4-chlorobutyD-5,6,7,8,9,10-hexahydro-, 59, 50 3//-Cyclohept(e]isoxazoles, 3a,4,5,6,7,8-hexahydro-, 60, 311-3 Cyclohex-2-en-l-ones, 2- and 3-bromo-, regioselectivity of nitrile oxide cycloaddition, 60, 304 Cyclols, piperazine-2,5-dione-related, 57, 211-7... 

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