The cationic rhodium(I) species derived from [Rh(COD)Cl](2) and AgSbF6 efficiently catalyze intrarnolecular [4+2] cycloadditions of ester-tethered 1,3-diene-8-yne derivatives such as 2-propynyl penta-2,4-dienoate and 2,4-pentadienyl propiolate derivatives in fluorinated alcohols. (c) 2005 Elsevier Ltd. All rights reserved.
Phosphine-Catalyzed <i>Anti</i>-Hydroboration of Internal Alkynes
Trialkylphosphine organocatalysts have enabled regioselective anti-hydroboration of internal, alkynes with pinacolborane reagents to provide (E)-disubstituted alkenylboronate compounds. The alkenyl-boronate can be used for derivatizations, such as protodeborylation, Suzuld-Miyaura coupling, conjugate reduction, and Diels-Alder reactions.
Synthesis of phosphonate 3-phthalidyl esters as prodrugs for potential intracellular delivery of phosphonates
作者:Qun Dang、Brian S. Brown、Paul D. van Poelje、Timothy J. Colby、Mark D. Erion
DOI:10.1016/s0960-894x(99)00239-5
日期:1999.6
A new prodrug approach for intracellular delivery of phosphonates was developed via the synthesis of 3-phthalidyl esters of 1-naphthalenemethylphosphonate. This approach is advantageous over the traditional acyloxymethyl phosphonate prodrugs, because these prodrugs do not generate formaldehyde and have improved plasma half-lives. (C) 1999 Elsevier Science Ltd. All rights reserved.