Silylenolether-Funktionalisierung, 3. Mitt. Regioselektive Acylierung von Trimethylsilylenolethern mit 2-Alkoxy-1,3-dioxolanen ? Synthese von ?- und ?-gesch�tzten Dicarbonylverbindungen
Studies Directed toward the Total Synthesis of Azaspiracid: Stereoselective Construction of C<sub>1</sub>−C<sub>12</sub>, C<sub>13</sub>−C<sub>19</sub>, and C<sub>21</sub>−C<sub>25</sub> Fragments
作者:Rich G. Carter、David J. Weldon
DOI:10.1021/ol006674w
日期:2000.11.1
[reaction: see text] The efficient entry to the C(1)-C(12), C(13)-C(19), and C(21)-C(25) fragments of azaspiracid is outlined. The C(1)-C(12) portion is constructed using a key asymmetric allenyl borane addition to the corresponding alpha,beta-unsaturated aldehyde. The synthesis of the C(13)-C(19) portion utilizes an Evans asymmetric alkylation followed by Sharpless asymmetric dihydroxylation. In addition