Synthesis of the sesquiterpenoid lactarane skeleton by a radical cyclobutylcarbinyl/cyclopropylcarbinyl fragmentation sequence
作者:Gordon L. Lange、Nadia Corelli
DOI:10.1016/j.tetlet.2007.01.068
日期:2007.3
A radicalreaction of a tetracyclic iodide results in a tandem cyclobutylcarbinyl/cyclopropylcarbinyl fragmentation sequence to generate the framework of the sesquiterpenoid lactarane family.
四环碘化物的自由基反应导致串联的环丁基羰基/环丙基羰基片段化序列生成倍半萜内酯类骨架。
An approach to the aromadendrane carbon skeleton by a radical fragmentation/3-exo-trig cyclization sequence
作者:Gordon L. Lange、Alexandru Merica
DOI:10.1016/s0040-4039(99)01647-0
日期:1999.11
A radical fragmentation/cyclization sequence of a [2+2] photoadduct derivative leads to the formation of the aromadendrane ring system. The 5,7 fused rings of this sesquiterpenoid family are formed in the fragmentation step and the cyclopropane moiety is the result of a 3-exo-trig cyclization. The cyclization step is facilitated by the use of SmI2 as the electron donor and by an ester group to stabilize
Ring expansions of [2 + 2] photoadducts. Potential applications in the synthesis of triquinane and taxane skeletons
作者:Gordon L. Lange、Carl P. Decicco、Jennifer Willson、Lou Anne Strickland
DOI:10.1021/jo00269a012
日期:1989.4
Synthesis of Terpenoids Using a Free Radical Fragmentation/Elimination Sequence
作者:Gordon L. Lange、Christine Gottardo、Alexandru Merica
DOI:10.1021/jo990307k
日期:1999.9.1
Total syntheses of the guaiane alismol 8 and the trinor-guaiane dictamnol 18 are reported. In both syntheses the initial [2+2] photoadduct is transformed into an iodo xanthate 14 or a diiodide 27, respectively. In the critical step, the strained bifunctional substrate undergoes a very efficient free radical fragmentation/elimination sequence to give the requisite seven-membered ring with regioselective