Seven-Membered Ring Formation from Cyclopropanated Oxo- and Epoxyallylsilanes
摘要:
A useful strategy for cycloheptane annulations from oxo- and epoxyallylsilanes, prepared by silylcupration of allenes, has been developed, and their application to the stereoselective synthesis of 4-methylenecycloheptan-1-ols is of great potential in the construction of seven-membered ring natural products presented.
Seven-Membered Ring Formation from Cyclopropanated Oxo- and Epoxyallylsilanes
摘要:
A useful strategy for cycloheptane annulations from oxo- and epoxyallylsilanes, prepared by silylcupration of allenes, has been developed, and their application to the stereoselective synthesis of 4-methylenecycloheptan-1-ols is of great potential in the construction of seven-membered ring natural products presented.
From Silylated Trishomoallylic Alcohols to Dioxaspiroundecanes or Oxocanes: Catalyst and Substitution Influence
作者:Asunción Barbero、Alberto Diez-Varga、Manuel Herrero、Francisco J. Pulido
DOI:10.1021/acs.joc.5b02260
日期:2016.4.1
A versatile method for the synthesis of dioxaspiroundecanes through a tandem Sakurai–Prins cyclization of allylsilyl alcohols in the presence of TMSOTf is described. The process is general and highly stereoselective with total control in the creation of three new stereogenic centers in a single step. Moreover, a very interesting chemoselectivity has been observed depending on the nature of the catalyst