Synthesis of Benzosiloles by Intramolecular anti-Hydroarylation via ortho-C–H Activation of Aryloxyethynyl Silanes
摘要:
Straightforward synthesis of benzosiloles was achieved by the invention of Pd/acid-catalyzed intramolecular anti-hydroarylation of aryloxyethynyl(aryl)-silanes via ortho-C-H bond activation. The aryloxy group bound to the ethynyl carbon is the key factor for this transformation.
The present invention provides novel alkaloid compounds and collections of these compounds, and provides methods for the synthesis of these compounds using biomimetic synthetic strategies. Additionally, the present invention provides pharmaceutical compositions and methods for treating disorders such as bacterial infections, proliferative diseases, and reproductive disorders, to name a few.
Amino acid-promoted C–H alkylation with alkylboronic acids using a removable directing group
作者:Yu Zhang、Hang Jiang、Dushen Chen、Yanghui Zhang
DOI:10.1039/c6ob00674d
日期:——
Palladium-catalyzed C–H alkylation reaction with alkylboronic acids has successfully been developed using a removable pyridyldiisopropylsilyl directing group. The amino acid played a crucial role as a ligand in the reaction. The alkylation protocol is also applicable to the coupling of C(sp3)–H bonds with alkylboronic acids.
The catalytic addition of terminalalkynes to 3,3-diarylcyclopropenes in the presence of a Rh(I)/binap complex proceeded to give the cycloaddition products in good yields, where a 1,4-Rh shift is involved as a key step.
Reagents and methods for library synthesis and screening
申请人:Howard Hughes Medical Institute
公开号:US20040014168A1
公开(公告)日:2004-01-22
The invention provides novel solid supports for the synthesis of compound libraries. The solid supports have the physical capacity to deliver at least 50 nmol of compound and are functionalized with a silicon-containing linker. In one embodiment of the invention the solid support comprises a bead having a diameter of between approximately 400 and 600 &mgr;m functionalized with a silicon-containing linker. According to certain embodiments of the invention the bead is a polystyrene bead. According to certain embodiments of the invention the linker is a diisopropylalkyl-substituted silyl ether. The invention further provides grafted polymeric supports such as lanterns functionalized with a silicon-containing linker.
The invention provides methods for screening in which compounds are synthesized on solid supports in a quantity so that a single solid support such as a bead provides a stock solution sufficient to perform hundreds or thousands of biological or chemical assays. The methods include decoding the sequence of chemical reactions used to synthesize the compound by identifying tags incorporated into the compound during synthesis.