and transitionmetal-free conditions, a series of functionalized N-alkylated sulfonamides were prepared. This protocol also enabled the functionalization of pharmaceutical drugs bearing a sulfonamide or carboxylic acid moiety. This radical-mediated process allowed the assembly of three components including sulfonamides, redox active esters, and alkenes to yield complex sulfonamides in a one-pot manner
Bifunctional Amino Sulfonohydrazide Catalyzed Direct Asymmetric Mannich Reaction of Cyclic Ketimines with Ketones: Highly Diastereo- and Enantioselective Construction of Quaternary Carbon Stereocenters
sulfonohydrazide which contains multiple sites for hydrogen bonding with substrates was found to enhance reactivity and enantioselectivity in the direct asymmetric Mannich reaction of N-sulfonyl cyclic ketimines with ketones. In this efficient transformation, not only methyl ketones but also cyclic ketones can be employed to provide a general methodology to construct tetrasubstituted α-amino ester in a stereoselective
A rhodium(III)-catalyzed sulfonamide directed ortho C–H carbenoid functionalization has been developed with good yields. This method is attractive due to its broad substrate scope, and enables derivation of diverse biologically active sulfonamide structures and late-stage modification of sulfa drugs.
Highly Enantioselective Construction of Fluoroalkylated Quaternary Stereocenters via Organocatalytic Dehydrated Mannich Reaction of Unprotected Hemiaminals with Ketones
作者:Sheng Zhang、Lijun Li、Yanbin Hu、Yanan Li、Yu Yang、Zhenggen Zha、Zhiyong Wang
DOI:10.1021/acs.orglett.5b02514
日期:2015.10.16
organocatalytic asymmetric dehydrated Mannich reaction of fluoroalkyl hemiaminals with ketones is reported. In this Mannich reaction, previously less explored aryl ketones showed great reactivity. By virtue of this efficient method, a wide range of biologically active β-amino ketones were directly obtained. More importantly, two different intermediates involved in the reaction were detected and identified by 19F
报道了氟代烷基半缩醛与酮的一般有机催化不对称脱水曼尼希反应。在该曼尼希反应中,以前较少探索的芳基酮显示出很高的反应活性。通过这种有效的方法,直接获得了广泛的生物活性β-氨基酮。更重要的是,通过19 F NMR和HRMS分析检测并鉴定了参与反应的两种不同中间体。此外,通过生物活性的氟烷基β-氨基醇的合成证明了产物的合成效用。
USE OF 4-SUBSTITUTED 1-PHENYLPYRAZOLE-3-CARBOXYLIC ACID DERIVATIVES AS AGENTS AGAINST ABIOTIC PLANT STRESS
申请人:BAYER INTELLECTUAL PROPERTY GMBH
公开号:US20140329684A1
公开(公告)日:2014-11-06
The invention relates to the use of 4-substituted 1-phenylpyrazole-3-carboxylic acid derivatives of the general formula (I), or salts thereof,
where the radicals in the general formula (I) correspond to the definitions given in the description,
for enhancing stress tolerance in plants to abiotic stress, for strengthening plant growth and/or for increasing plant yield, and to selected processes for preparing the compounds mentioned above.