Regio- and Stereoselective Synthesis of Multi-Alkylated Allylic Boronates through Three-Component Coupling Reactions between Allenes, Alkyl Halides, and a Diboron Reagent
作者:Yu Ozawa、Kohei Endo、Hajime Ito
DOI:10.1021/jacs.1c06538
日期:2021.9.1
valuable precursors for the rapid and stereoselective construction of densely substituted carbon skeletons. Herein, we report the first synthetic approach for differentially 2,3,3-trialkyl-substituted allylic boronates that contain a stereodefined tetrasubstituted alkene structure. Copper(I)-catalyzed regio- and stereoselectivethree-component coupling reactions between gem-dialkylallenes, alkyl halides
[EN] DRUG DELIVERY SYSTEM<br/>[FR] SYSTEME DE LIBERATION DE MEDICAMENT
申请人:LEIRAS OY
公开号:WO2003017971A1
公开(公告)日:2003-03-06
The invention relates to a delivery system comprising at least one core and a membrane. The core and the membrane consist of an elastomer composition comprising e.g poly (dimethylsiloxane), a siloxane-based elastomer comprising 3,3,3-trifluorpropyl groups attached to the Si-atoms of the siloxane units and/or poly(alkylene oxide) groups, present as alkoxy-terminated grafts or blocks linked to the polysiloxane units by silicon-carbon bonds, or as a mixture of these forms. The delivery system is preferably an implant or an intrauterine, intracervical or intravaginal system.