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Total synthesis of Avermectin A1a (Part):
Reference: Danishefsky, S.J.; et. al. J. Am. Chem. Soc., 1989, 111, 2967.
Keywords: Si-Allyl+Carbonium --- Cu-Me+Allyl-OPiv
Reagents: Crotyl-SiR3 --- BF3·OEt2 --- LiCuMe2

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