Probing the Peroxycarbenium [3+2] Cycloaddition Reactions with 1,2-Disubstituted Ethylenes: Results and Insights
作者:Ze-Jun Xu、Sergio Wittlin、Yikang Wu
DOI:10.1002/chem.201605871
日期:2017.2.10
the title reaction to be limited to only the alkenes with an unsubstituted terminal alkenic carbon were explored. In some “failed” cases the cycloaddition products actually formed but rearranged concurrently. An oxygen atom or a N‐Boc (Boc=tert‐butyloxycarbonyl) group at the double bond was proven essential for acquisition of intact [3+2] cycloaddition products from 1,2‐disubstituted ethylenes.
Design and synthesis of orally active dispiro 1,2,4,5-tetraoxanes; synthetic antimalarials with superior activity to artemisinin
作者:Richard Amewu、Andrew V. Stachulski、Stephen A. Ward、Neil G. Berry、Patrick G. Bray、Jill Davies、Gael Labat、Livia Vivas、Paul M. O'Neill
DOI:10.1039/b613565j
日期:——
Unsymmetrical dispiro- and spirotetraoxanes have been designed and synthesized via acid-catalyzed cyclocondensation of bis(hydroperoxides) with ketones. Incorporation of water-soluble and polar functionalities, via reductive amination and amide bond formation, produces several analogues with low nanomolar in vitro antimalarial activity. Several analogues display an unprecedented level of oral antimalarial activity for this class of endoperoxide drug.