Cyclobutenone-Based Syntheses of Polyquinanes and Bicyclo[6.3.0]undecanes by Tandem Anionic Oxy-Cope Reactions. Total Synthesis of (±)-Precapnelladiene
作者:James M. MacDougall、Vincent J. Santora、Sharad K. Verma、Philip Turnbull、Cameron R. Hernandez、Harold W. Moore
DOI:10.1021/jo980712w
日期:1998.10.1
by a transannular aldol reaction of the intermediate bicyclo[6.3.0]undecadienone 4. Additional functionality is introduced by alkylation of the enolate 3 resulting from the oxy-Cope rearrangement. Phosphorylation or triflation of enolate 3 provides an entry into the bicyclo[6.3.0]undecane ring system. An application of this new methodology is demonstrated by the total synthesis of the sesquiterpene natural
将乙烯基锂衍生物加到二烷基方酸衍生的双环庚烯酮的羰基上,例如1a和6a,引发低温阴离子加速的氧-Cope重排,以通过中间双环的环戊醛羟醛反应提供聚喹烷[6.3.0]。十一碳烯酮4。通过由氧基-Cope重排产生的烯酸酯3的烷基化引入了附加的官能度。烯酸酯3的磷酸化或三氟甲基化提供了进入双环[6.3.0]十一烷环系统的入口。这种新方法的应用通过二异丙基方酸(10步,12%)的全合成倍半萜烯天然产物(+/-)-capcapellaelladiene得以证明。