Scheme 2. Synthesis of 4, 7 and 8 from 2. Reagents and conditions: (i) 3KN3, THF, –3KI; (ii) 3KC8, benzene or toluene, –3C8, –1.5 KN3, –1.5N2, –KCH2Ph or –KC6H5; (iii) 3KC8, THF or DME, –1.5KN3, –1.5N2.
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