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- [33] FUSED PYRIMIDINES BY A TANDEM AZA-WITTIG ELECTROCYCLIC RING-CLOSURE STRATEGY - SYNTHESIS OF PYRAZOLO[3,4-D]PYRIMIDINE, [1,2,3]TRIAZOLO[4,5-D]PYRIMIDINE, AND THIAZOLO[4,5-D]PYRIMIDINE DERIVATIVES JOURNAL OF ORGANIC CHEMISTRY, 1988, 53 (20): : 4654 - 4663