Scheme 278. Base-Promoted Cyclization toward an Alpkinidine Analogue.
Reagents and conditions: (a)521 NaHMDS, THF, −95 °C, 10 min, then rt, 4 h; (b) (1) NaOEt, EtOH, rt, 2 h, (2) allyl bromide, 6 h.
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