Studies Towards the Total Synthesis of Di- and Sesterterpenes with Dicyclopenta[a,d]cyclooctane Skeletons. Three-component Approach to the A/B Rings Building Block
作者:K. Michalak、M. Michalak、J. Wicha
DOI:10.3390/10091084
日期:——
fusicoccin families are important synthetic targets because of complexity of structure and potentially useful physiological activities, including anti-tumor activity. A synthesis of versatile buildingblocks for these terpenoids is described. Cyclopenta[8]annulene rings system with properly dislocated substituents was constructed using as key steps ring closing metathesis reaction and Wagner - Meerwein
Studies toward the total synthesis of di- and sesterterpenes with a dicyclopenta[a,d]cyclooctane skeleton. Construction of a versatile A/B ring building block via a ring-closing metathesis reaction and carbocationic rearrangement
作者:Karol Michalak、Michał Michalak、Jerzy Wicha
DOI:10.1016/j.tetlet.2004.12.077
日期:2005.2
The cyclopentacyclooctane derivative 1, chosen as the keybuildingblock in a synthesis of terpenoid ophiobolates and fusicoccins, has been prepared from 2-methylcyclo-pent-2-en-1-one 5. Cyclization of the intermediate 1,9-diene of l,u configuration 10 under metathesis conditions (Grubbs’ catalyst 15) afforded the eight-membered ring product 13, whereas cyclization of the l,l diastereomer 9 produced