Creation of Highly Congested Quaternary Centers via Cu-catalyzed Conjugate Addition of Alkenyl Alanates to β-Substituted Cyclic Enones
作者:Daniel Müller、Alexandre Alexakis
DOI:10.1021/ol400378v
日期:2013.4.5
prepared alkenylalanates proved to be excellent nucleophiles for the creation of highly congested quaternary centers via copper-catalyzed conjugateaddition. In addition, functionalized cis-decaline systems can now be prepared in a simple two-step sequence involving Cu-catalyzed conjugateaddition with functionalized alkenylalanates.
Constructing Quaternary Stereogenic Centers Using Tertiary Organocuprates and Tertiary Radicals. Total Synthesis of <i>trans</i>-Clerodane Natural Products
作者:Daniel S. Müller、Nicholas L. Untiedt、André P. Dieskau、Gregory L. Lackner、Larry E. Overman
DOI:10.1021/ja512527s
日期:2015.1.21
A new concise construction of trans-clerodane diterpenoids is reported in which oxacyclic and trans-hydronaphthalene fragments are coupled, and the critical C9-quaternary carbon stereocenter formed stereoselectively, by 1,6-addition of a tertiary cuprate or a tertiary carbon radical to β-vinylbutenolide. This strategy is specifically illustrated by total syntheses of (-)-solidagolactone (4), (-)-16-hydroxycleroda-3