Efficient and convergent stereocontrolled spiroannulation of ketones
作者:István E. Markó、Jean-Christophe Vanherck、Ali Ates、Bernard Tinant、Jean-Paul Declercq
DOI:10.1016/s0040-4039(03)00573-2
日期:2003.4
Upon treatment with tBuOK/H2O, a variety of ω-halo-β-keto-ketals undergo smooth cyclisation, affording in excellent yields mono-protected [n,m] spiro bicyclic diketones. This transformation is highly stereoselective producing, in all cases, the diastereoisomerically pure spiro derivatives.
用t BuOK / H 2 O处理后,各种ω-卤代-β-酮缩酮均进行平滑环化,从而以优异的收率得到单保护的[n,m]螺双环二酮。在所有情况下,这种转化都是高度立体选择性的,产生非对映异构纯的螺衍生物。
Novel Annelation Methodology for the Rapid and Efficient Construction of Bicyclo [4.n.0] Alkanols and Alkenones
作者:István E. Markó、Ali Ates
DOI:10.1055/s-1999-2768
日期:1999.7
The efficient assembly of a range of fused bicyclic alcohols and enones can be readily performed using a novel, orthoester-based, annelation methodology.
Masked β-, γ- and δ-lithium ester enolates: useful reagents in organic synthesis
作者:Isidro M Pastor、Miguel Yus
DOI:10.1016/s0040-4039(00)02172-9
日期:2001.2
acid-catalysed methanolysis, to functionalised methyl esters 2. In the case of chlorotrimethylsilane, hydroxyethyl esters 2′ are isolated. The reaction is also applied to bicyclic orthoesters 3: whereas β-chloro derivatives and carbonyl compounds gives directly γ-lactones 4 after hydrolysis, the corresponding γ-chloro derivative affords the expected methyl esters after methanolysis.
Functionalized Orthoesters as Powerful Building Blocks for the Efficient Preparation of Heteroaromatic Bicycles
作者:Gulluzar Bastug、Christophe Eviolitte、István E. Markó
DOI:10.1021/ol301472a
日期:2012.7.6
By combining substituted anilines with functionalized orthoesters, an efficient and connective methodology for the preparation of benzoxazole, benzothiazole, and benzimidazole derivatives has been established. The versatility of this approach enables the development of new libraries of heterocycles containing multifunctional sites.
Stereoselective synthesis of bicyclic lactones by annelation with functionalised orthoesters
作者:Nuno Maulide、István E. Markó
DOI:10.1039/b600677a
日期:——
An efficient two-step annelation of functionalised orthoesters with trimethylsilyloxyfuran derivatives, which delivers suitably decorated bicyclo[3.n.0]lactones in high overall yields and with complete diastereocontrol of up to three contiguous stereocenters, is reported.