Stereoisomerically Pure Trisubstituted Vinylaluminum Reagents and their Utility in Copper‐Catalyzed Enantioselective Synthesis of 1,4‐Dienes Containing
<i>Z</i>
or
<i>E</i>
Alkenes
作者:Katsuhiro Akiyama、Fang Gao、Amir H. Hoveyda
DOI:10.1002/anie.200905223
日期:2010.1.8
The desired isomer of a chiral 1,4‐diene containing an E or Z double bond can be accessed readily by a regio‐ and stereoselective hydroalumination of silyl‐substituted alkynes and subsequent enantioselective copper‐catalyzed allylic alkylation. The utility of the procedure was demonstrated through the synthesis of (−)‐nyasol (see scheme). dibal‐H=diisobutylaluminum hydride, NHC=N‐heterocyclic carbene
THIAZOLIDINE CARBOXAMIDE DERIVATIVES AS MODULATORS OF THE PROSTAGLANDIN F RECEPTOR
申请人:PAGE Patrick Naxos
公开号:US20080255094A1
公开(公告)日:2008-10-16
The present invention is related to thiazolidine carboxamide derivatives of formula (II) for the treatment and/or prophylaxis of preterm labor, premature birth, dysmenorrhea and for stopping labor prior to cesarean delivery.
Visible-light-induced one-pot synthesis of sulfonic esters <i>via</i> multicomponent reaction of arylazo sulfones and alcohols
作者:Truong Giang Luu、Tien Tan Bui、Hee-Kwon Kim
DOI:10.1039/d2ra02656b
日期:——
Sulfonic ester is a chemical structure common to many organic molecules, including biologically active compounds. Herein, a visible-light-induced synthetic method to prepare aryl sulfonic ester from arylazo sulfones was developed. In the present study, a one-pot reaction was carried out using arylazo sulfones, DABSO (DABCO·(SO2)2), and alcohols in the presence of CuI as a coupling catalyst and HCl
Catalyst for olefin polymerization and method for producing olefin polymers using the same
申请人:MITSUBISHI CHEMICAL CORPORATION
公开号:EP0759445A1
公开(公告)日:1997-02-26
A catalyst for olefin polymerization comprising the following Components (A) to (D), Component (D) being optional, in combination:
(A): a solid catalyst component comprising Ti, Mg, a halogen and an electron donor;
(B): an organoaluminum compound;
(C): a sulfonic ester represented by R4SO3R5 (R4 and R5: hydrocarbon group); and
(D): an organosilicon compound.
The electron-donating compound comprised in Component (A) is specified in one aspect of the invention.
Olefin polymers having excellent moldability and processability and extremely high crystallinity can be produced in high yield when the above catalyst is used.