A general synthesis of dioxolenone prodrug moieties
摘要:
A general method for the synthesis of dioxolenone prodrug moieties from appropriately substituted beta-ketoesters is described. This novel and versatile sequence allows for the synthesis of alkyl- or aryl-substituted dioxolenone alcohols 8 or bromides 9. Coupling of the bromides 9 to prepare bis-dioxolenone phosphonate prodrug esters is also presented. (C) 2002 Elsevier Science Ltd. All rights reserved.
Oxone-promoted hydration of electron-deficient allenic esters and ketones into 1,3-dicarbonyl compounds
摘要:
A novel and mild protocol for the hydration of electron-deficient allenic esters and ketones into various 1,3-dicarbonyl compounds is described. The hydration of allenes promoted by oxone in DMF afforded the corresponding products in moderate to good yields. This work features the employment of only a catalytic amount of inexpensive and nontoxic solid reagent oxone (2KHSO(5)center dot KHSO4 center dot K2SO4), avoiding the utility of toxic metals or traditional Bronsted acids, in a green version of viewpoint. A possible reaction mechanism for this transformation is also primarily proposed. (C) 2015 Elsevier Ltd. All rights reserved.