Metal-free, hydroacylation of CC and NN bonds via aerobic C–H activation of aldehydes, and reaction of the products thereof
作者:Vijay Chudasama、Ahmed R. Akhbar、Karim A. Bahou、Richard J. Fitzmaurice、Stephen Caddick
DOI:10.1039/c3ob41632a
日期:——
In this report, a thorough evaluation of the use of aerobically initiated, metal-free hydroacylation of various CC and NN acceptor molecules with a wide range of aldehydes is presented. The aerobic-activation conditions that have been developed are in sharp contrast to previous conditions for hydroacylation, which tend to use transition metals, peroxides that require thermal or photochemical degradation, or N-heterocyclic carbenes. The mildness of the conditions enables a number of reactions involving sensitive reaction partners and, perhaps most significantly, allows for α-functionalised chiral aldehydes to undergo radical-based hydroacylation with complete retention of optical purity. We also demonstrate how the resulting hydroacylation products can be transformed into other useful intermediates, such as γ-keto-sulfonamides, sultams, sultones, cyclic N-sulfonyl imines and amides.
Synthesis of Gibberellic Acid Derivatives and Their Effects on Plant Growth
作者:Hao Tian、Yiren Xu、Shaojin Liu、Dingsha Jin、Jianjun Zhang、Liusheng Duan、Weiming Tan
DOI:10.3390/molecules22050694
日期:——
A series of novel C-3-OH substituted gibberellin derivatives bearing an amide group were designed and synthesized from the natural product gibberellic acid (GA₃). Their activities on the plantgrowth regulation of rice and Arabidopsis were evaluated in vivo. Among these compounds, 10d and 10f exhibited appreciable inhibitory activities on rice (48.6% at 100 μmol/L) and Arabidopsis (41.4% at 100 μmol/L)
Hydrophobically Modified Antisense Oligonucleotides Comprising a Ketal Group
申请人:INSTITUT NATIONAL DE LA SANTE ET DE LA RECHERCHE MEDICALE (INSERM)
公开号:US20160108398A1
公开(公告)日:2016-04-21
The present invention concerns an oligonucleotide modified by substitution at the 3′ or the 5′ end by a moiety comprising at least one ketal functional group, wherein the ketal carbon of said ketal functional group bears two saturated or unsaturated, linear or branched, hydrocarbon chains comprising from 1 to 22 carbon atoms, and the use therefore as a medicament, in particular for use for treating cancer.
Alkynesdifunctionalization is a powerful strategy in organic synthesis that provides a convenient synthetic entry for internal alkenes. The main challenge in this field was considered to be the geometry control of the newly formed double bond (thermodynamically controlled or kinetically controlled). Herein, we report a novel procedure (through the cyclic compounds broken) to completely control the
of heavy metals (Cd, Cu, Ni and Pb). The obtained polymer-supported triazoles were characterized by infrared spectroscopy and thermal analysis (DSC). Evaluation of metallic cation extraction was done by atomicabsorption of the remaining solutions. Three polymers efficiently removed Ni Cu and Pb with extraction yields between 50 and 90%. Two of the polymers studied had a high selectivity of extraction