Scheme 7.
Generation of triple hybrids 31–34. a) PPTS, MeOH / CH2Cl2, 0 → 20 °C, 16 h; b) NaHMDS, THF, −78 °C, 10 min; 29 or 30, −78 → 0 °C, 30 min; c) HF·py, pyridine, THF, 0 → 20 °C, 3 d. NaHMDS = sodium hexamethyldisilazide.
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