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- W2102494927 abstract "A highly convergent synthesis of the macrolide natural product milbemycin β1 is reported. The key features of this synthesis include the introduction of the C11-C15 side chain by selective ring opening of a symmetrical 1,4-pentane bis-epoxide (3) followed by reaction with the anion derived from the 2,3-trans-dimethyl-6-phenylsulphonyl pyran (2) to afford the “northern” C11-C25 fragment (33) of milbemycin β1. Coupling of the derived C11-C25 aldehyde unit (37) with a C1-C10 southern zone fragment (5) was achieved via a novel deconjugative vinyl sulphone anion sequence to give a product containing all the carbon substituents of the natural product. Final manipulations involved macrolactonisation and subsequent introduction of the important 3,4-double bond by selenoxide syn-elimination. Methylation of the C-5 hydroxyl group was accomplished as the penultimate step with methyl iodide and silver (I) oxide under ultrasonication." @default.
- W2102494927 created "2016-06-24" @default.
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- W2102494927 date "1989-01-01" @default.
- W2102494927 modified "2023-10-15" @default.
- W2102494927 title "A highly convergent total synthesis of the spiroacetal macrolide (+)-milbemycinβ1" @default.
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- W2102494927 doi "https://doi.org/10.1016/s0040-4020(01)89182-1" @default.
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