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.
作者:Alesandere Ortega、Rubén Manzano、Uxue Uria、Luisa Carrillo、Efraim Reyes、Tomas Tejero、Pedro Merino、Jose L. Vicario
DOI:10.1002/anie.201804614
日期:2018.7.2
Racemic cyclopropyl ketones undergo enantioselectiverearrangement to deliver the corresponding dihydrofurans in the presence of a chiral phosphoric acid as the catalyst. The reaction involves activation of the donor‐acceptor cyclopropane substrate by the chiral Brønsted acid catalyst to promote the ring‐opening event, thus generating a carbocationic intermediate that subsequently undergoes cyclization
A method of preparing intermediates for carbapenem antibiotics characterized by treating a N-deprotected acetoxy conpound of the formula: ##STR1## in the presence of a Lewis acid or a silylating agent to yeild an intermediate; and cyclizing the intermediate in the presence of rhodium (II) acetate to form a bicyclic ketoester.
Dinitrogen extrusion from enoldiazo compounds under thermal conditions: synthesis of donor–acceptor cyclopropenes
作者:Yongming Deng、Changcheng Jing、Michael P. Doyle
DOI:10.1039/c5cc05006e
日期:——
Donor-acceptor cyclopropenes are formed quantitatively or in high yield from enoldiazoacetates and enoldiazoacetamides under moderate thermal conditions. They are more versatile than their corresponding enoldiazocarbonyl compounds as carbene precursors.