Aryl–secondary alkyl cross-coupling with aryl sulfonate esters as coupling partners remains a significant challenge. Efficient cross-coupling between aryl/alkenyl triflates and acyclicsecondary alkylboronic acids is realized for the first time to provide a series of sterically congested acyclicsecondary alkyl arenes/olefins in good to excellent yields. The employment of sterically bulky P,PO ligand L1/L2 is
SUBSTITUTED VINYL AND ALKINYL CYCLOHEXENOLS AS ACTIVE AGENTS AGAINST ABIOTIC STRESS IN PLANTS
申请人:Frackenpohl Jens
公开号:US20140080704A1
公开(公告)日:2014-03-20
The invention relates to substituted vinyl- and alkynylcyclohexenols of the general formula (I) and salts thereof
where the R
1
, R
2
, R
3
, R
4
, R
5
, [X—Y] and Q radicals are each as defined in the description, to processes for preparation thereof and to the use thereof for enhancing stress tolerance in plants with respect to abiotic stress, and/or for increasing plant yield.
Regio- and Chemoselective Kumada–Tamao–Corriu Reaction of Aryl Alkyl Ethers Catalyzed by Chromium Under Mild Conditions
作者:Xuefeng Cong、Huarong Tang、Xiaoming Zeng
DOI:10.1021/jacs.5b08621
日期:2015.11.18
the cross-coupling reactions with arylethers via C-O bond activation have attracted broad interest. However, the functionalizations of C-O bonds are mainly limited to nickel catalysis, and selectivity has long been a prominent challenge when several C-O bonds are present in the one molecule. We report here the first chromium-catalyzed selective cross-coupling reactions of arylethers with Grignard reagents
作为一种环境友好的合成工具,通过 CO 键活化与芳基醚的交叉偶联反应引起了广泛的兴趣。然而,CO 键的功能化主要限于镍催化,当一个分子中存在多个 CO 键时,选择性一直是一个突出的挑战。我们在这里报告了第一个铬催化的芳基醚与格氏试剂通过 CO(烷基)键断裂的选择性交叉偶联反应。在室温下使用简单、廉价的铬 (II) 预催化剂结合亚氨基助剂实现了多种转化。它为高效和选择性地构建官能化芳香醛提供了新途径。
SUBSTITUTED VINYL AND ALKYNYL CYANOCYCLOALKANOLS AND VINYL AND ALKYNYL CYANOHETEROCYCLOALKANOLS AS ACTIVE AGENTS AGAINST ABIOTIC PLANT STRESS
申请人:BAYER CROPSCIENCE AKTIENGESELLSCHAFT
公开号:US20170197910A1
公开(公告)日:2017-07-13
Substituted vinyl- and alkynylcyanocycloalkanols and vinyl- and alkynylcyanoheterocyclylalkanols of the general formula (I) or salts thereof
where
[X—Y], Q, R
1
, R
2
, A
1
, A
2
, V, W, m and n are each as defined in the description, processes for preparation thereof and the use thereof for enhancing stress tolerance in plants with respect to abiotic stress, and/or for increasing plant yield.
This invention relates to novel compounds which are derivatives of the phosphodiesterase inhibitor, cilostazol and pharmaceutically acceptable salts thereof. This invention also provides pyrogen-free compositions comprising one or more compounds of the invention and the use of the disclosed compounds and compositions in methods of treating diseases and conditions that are treated by administration of a phosphodiesterase inhibitor, such as cilostazol. The invention also relates to the use of the disclosed compounds and compositions as reagents in analytical studies involving cilostazol.