Resorcylic Acid Lactones with Cytotoxic and NF-κB Inhibitory Activities and Their Structure–Activity Relationships
作者:Sloan Ayers、Tyler N. Graf、Audrey F. Adcock、David J. Kroll、Susan Matthew、Esperanza J. Carcache de Blanco、Qi Shen、Steven M. Swanson、Mansukh C. Wani、Cedric J. Pearce、Nicholas H. Oberlies
DOI:10.1021/np200062x
日期:2011.5.27
fractionation yielded resorcylic acid lactones (RALs) 1 (a new natural product) and 3 (a new compound) and the known RALs zeaenol (2), (5E)-7-oxozeaenol (4), (5Z)-7-oxozeaenol (5), and LL-Z1640-1 (6). Reduction of (5E)-7-oxozeaenol (4) with sodium borohydride produced 3, which allowed assignment of the absolute configuration of 3. Other known resorcylic acid lactones (7–12) were purchased and assayed in parallel
The protecting-group directed diastereoselective Nozaki–Hiyama–Kishi (NHK) reaction: total synthesis and biological evaluation of zeaenol, 7-epi-zeaenol and its analogues
作者:Debendra K. Mohapatra、D. Sai Reddy、N. Arjunreddy Mallampudi、Janardhan Gaddam、Sowjanya Polepalli、Nishant Jain、J. S. Yadav
DOI:10.1039/c4ob01811g
日期:——
The stereoselectivetotalsynthesis of zeaenol and 7-epi-zeaenol is achieved in a convergent manner using Julia-Kocienski olefination, protecting group-directed intermolecular diastereoselective Nozaki–Hiyama–Kishi (NHK) reaction, De Brabander's lactonization reaction and CBS reduction as the key steps. In this article, we have observed the most suitable protecting groups with respect to selectivity
Abstract An efficient, short and, a convenient asymmetrictotal synthesis of filamentous fungi related resorcylic acid lactones 7-epi-zeaenol (2) and zeaenol (1) have been achieved in 7 and 9 linear steps with the high overall yield of 32% and 21% respectively, from the known intermediate 13. Mitsunobu inversion, De Brabander’s protocol for macrolactonisation, Heck cross-coupling, diastereoselective