Scheme 10.
Synthesis of the Dil unit (129). Reagents and conditions: (a) CDI (carbonyl dimidazole), THF; (b) (1) CH3I, KHCO3, (2) LiCl, NaBH4, (3) DMSO, Py·SO3; (c) NaBH4; (d) NaOH; (e) (1) NaH, (2) CH3I.
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