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Synlett 1990; 1990(6): 328-330
DOI: 10.1055/s-1990-21080
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Total Synthesis of Avermectin B1a: Final Coupling Reactions and the Total Synthesis of Avermectin B1a Aglycone

Alan Armstrong* , Steven V. Ley, Andrew Madin, Subhabrata Mukherjee
  • *Department of Chemistry, Imperial College of Science, Technology and Medicine, London, SW7 2AY, England
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Publication Date:
08 March 2002 (online)

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Synthesis of the avermectin B1a aglycone (3) involving sulphone stabilised anion coupling of a C1-C10 fragment 1 with C11-C25 spiroacetal portion 2 is described. The synthesis exploits chemoselectivity in an effort to minimise the need for functional group protection.

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