A synthesis of (+)-milbemycin β<sub>3</sub>. The 3,4-dihydro-2H-pyran approach
作者:Clive Yeates、Stephen D. A. Street、Philip Kocienski、Simon F. Campbell
DOI:10.1039/c39850001388
日期:——
Nucleophilic scission of oxirane (8) by vinyl alanate (4) and oxirane (11) by metallated 3,4-dihydro-2H-pyran (15) were key steps in the synthesis of (+)-milbemycin β3(1).
A synthesis of (+)-milbemycin β<sub>3</sub>. The directed aldol approach
作者:Stephen D. A. Street、Clive Yeates、Philip Kocienski、Simon F. Campbell
DOI:10.1039/c39850001386
日期:——
A synthesis of (+)-milbemycinβ, is reported in which key steps are the construction of the 1,7-dioxaspiro[5.5]undecane (15) by a Lewis acid-catalysed intramolecular directedaldol 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).