2.4- Diamino-6-pyrrolidino-5-

Pteridine, 2,4-diamino-7-pyrrolidino-hydrolysis, 3, 294 synthesis, 3, 290 Pteridine, 2,4-diamino-7-styryl-synthesis, 3, 319 Pteridine, 2,4-dichloro-properties, 3, 267 Pteridine, 4,6-dichloro-reaction... 

Massa et al. cyclized pyrrolidines 19 in DCC to obtain the pyrrolidino-1,4-benzodiazocinediones 20 (81FES425). When Thompson reacted succinic anhydride with 2,3-diaminopyridine, the diamino acid 21 was obtained. This compound could be cyclodehydrated to 22 in acetic anhydride however, succinic and phthalic anhydride reacted with a diaminopyridine to afford diazocines directly (see Section II,C,1) (86JHC1545). 

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