Hydroxyl-Directed Stereoselective Diboration of Alkenes
作者:Thomas P. Blaisdell、Thomas C. Caya、Liang Zhang、Amparo Sanz-Marco、James P. Morken
DOI:10.1021/ja504228p
日期:2014.7.2
An alkoxide-catalyzed directed diboration of alkenyl alcohols is described. This reaction occurs in a stereoselective fashion and is demonstrated with cyclic and acyclichomoallylic and bishomoallylic alcohol substrates. After oxidation, the reaction generates 1,2-diols such that the process represents a method for the stereoselective directed dihydroxylation of alkenes.
Simple and efficient access to tetrahydrofurans, tetrahydropyrans, and pyrrolidines through a tandem cross-metathesis/1,4-addition process from (E)-dimethyl2-oxopent-3-enylphosphonate and N-protected ω-unsaturated amines or alcohols under microwave irradiation is described. As the Grubbs–Hoveyda catalyst is highly chemoselective, a diversity of functionalizedheterocycles were synthesized. Furthermore
NOVEL COMPOUND DERIVED FROM PLANT OF GENUS QUAMOCLIT AND COMPOSITION CONTAINING SAME AS ACTIVE INGREDIENT FOR PREVENTING OR TREATING DIABETES
申请人:KOREA RESEARCH INSTITUTE BIOSCIENCE
公开号:US20160130293A1
公开(公告)日:2016-05-12
The present invention provides a novel compound isolated from a plant of the genus
Quamoclit
and a method for preparing a novel compound isolated from a plant of the genus
Quamoclit
through chemical synthesis, and relates to a novel compound and a composition containing the novel compound as an active ingredient for preventing or treating diabetes and diabetic complications. The compound derived from a plant of the genus
Quamoclit
and the composition containing the compound as an active ingredient according to the present invention have an excellent effect of promoting insulin secretion, thereby exhibiting efficacies in preventing or treating diabetes and the resulting various complications.
Catalyst-Controlled Wacker-Type Oxidation of Homoallylic Alcohols in the Absence of Protecting Groups
作者:Jessica R. McCombs、Brian W. Michel、Matthew S. Sigman
DOI:10.1021/jo200462a
日期:2011.5.6
Homoallylicalcohols are oxidized to β-hydroxy ketones using a TBHP-mediated Pd-catalyzed Wacker-type oxidation. The use of a bidentate ligand, quinoline-2-oxazoline (Quinox), and TBHP(aq) as the terminal oxidant provides good yields of the desired products with reaction times significantly reduced as compared to the Tsuji−Wacker oxidation. Additionally, bis- and tris-homoallylic alcohols are oxidized