- Stereoselective Dehydroxyboration of Allylic Alcohols to Access (E)-Allylboronates by a Combination of C-OH Cleavage and Boron Transfer under Iron Catalysis
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Iron-catalyzed direct SN2′ dehydroxyboration of allylic alcohols has been developed to access (E)-stereoselective allylboronates. Allylic alcohols with diverse structures and functional groups, especially derived from natural products, underwent smooth transformation. The six-membered ring transition state formed by allylic alcohols and iron-boron intermediate was indicated to be the key component involved in transfer of the boron group, activation of the C-OH bond, and control of the stereoselectivity.
- Su, Wei,Wang, Ting-Ting,Tian, Xia,Han, Jian-Rong,Zhen, Xiao-Li,Fan, Shi-Ming,You, Ya-Xin,Zhang, Yu-Kun,Qiao, Rui-Xiao,Cheng, Qiushi,Liu, Shouxin
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supporting information
p. 9094 - 9099
(2021/11/30)
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- Two-step synthesis of achiral dispiro-1,2,4,5-tetraoxanes with outstanding antimalarial activity, low toxicity, and high-stability profiles
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A rapid, two-step synthesis of a range of dispiro-1,2,4,5-tetraoxanes with potent antimalarial activity both in vitro and in vivo has been achieved. These 1,2,4,5-tetraoxanes have been proven to be superior to 1,2,4-trioxolanes in terms of stability and to be superior to trioxane analogues in terms of both stability and activity. Selected analogues have in vitro nanomolar antimalarial activity and good oral activity and are nontoxic in screens for both cytotoxicity and genotoxicity. The synthesis of a fluorescent 7-nitrobenza-2-oxa-1,3-diazole (NBD) tagged tetraoxane probe and use of laser scanning confocal microscopy techniques have shown that tagged molecules accumulate selectively only in parasite infected erythrocytes and that intraparasitic formation of adducts could be inhibited by co-incubation with the iron chelator desferrioxamine (DFO).
- Ellis, Gemma L.,Amewu, Richard,Sabbani, Sunil,Stocks, Paul A.,Shone, Alison,Stanford, Deborah,Gibbons, Peter,Davies, Jill,Vivas, Livia,Charnaud, Sarah,Bongard, Emily,Hall, Charlotte,Rimmer, Karen,Lozanom, Sonia,Jesús, María,Gargallo, Domingo,Ward, Stephen A.,O'Neill, Paul M.
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p. 2170 - 2177
(2008/12/21)
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- DISPIRO TETRAOXANE COMPOUNDS
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A compound having the formula (I) wherein ring A represents a substituted or unsubstituted monocyclic or multicyclic ring; m=any positive integer; n=0-5; X=CH and Y=-C(O)NR1R2, -NR1R2 or -S(O)2R4, where R1, R2 and R4 are each individually selected from the group consisting of H, substituted or unsubstituted alkyl, substituted or unsubstituted aryl, substituted or unsubstituted amine, substituted or unsubstituted carbocyclic ring, substituted or unsubstituted heterocyclic ring, or any combination thereof, or R1 and R2 are linked so as to form part of a substituted or unsubstituted heterocyclic ring, or X=N and Y=-S(O)2R3 or -C(O)R3, where R3 is selected from the group consisting of H, substituted or unsubstituted alkyl, substituted or unsubstituted aryl, substituted or unsubstituted amine, substituted or unsubstituted carbocyclic ring, substituted or unsubstituted heterocyclic ring or any combination thereof.
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Page/Page column 79
(2008/06/13)
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- Spiro and dispiro 1,2,4-trioxolane antimalarials
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A means and method for treating malaria using a spiro or dispiro 1,2,4-trioxolane is described. The preferred 1,2,4-trioxolanes include a spiroadamantane group on one side of the trioxolane group, and a spirocyclohexyl or spiropiperidyl ring on the other side of the trioxolane group, whereby the spirocyclohexyl ring is preferably functionalized or substituted at the 4-position or a spiropiperidyl ring that is functionalized or substituted at the nitrogen atom. In comparison to artemisinin semisynthetic derivatives, the compounds of this invention are structurally simple, easy to synthesize, non-toxic, and potent against malarial parasites.
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