A synthesis of (+)-milbemycin β3. The directed aldol approach

Abstract
A synthesis of (+)-milbemycin β, is reported in which key steps are the construction of the 1,7-dioxaspiro[5.5]undecane (15) by a Lewis acid-catalysed intramolecular directed aldol reaction and the use of sulphone-based olefination reactions for the construction of the double bonds at C(10)–C(11) and C(14)–C(15).

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