Trans-Selective Olefination of Carbonyl Compounds by Low-Valent Titanium-Mediated Dehydroxybenzotriazolylation
摘要:
Lithiation with n-butyllithium of a variety of benzotriazole derivatives 1a-f and 5a-d, all containing a proton alpha to the benzotriazolyl moiety, gave anions which underwent addition to aliphatic, aromatic, and alpha,beta-unsaturated aldehydes and cyclic and acyclic ketones. The resultant N-(beta-hydroxyalkyl)benzotriazole derivatives 3a-m, 6a-g, 9a-d, and 10a were dehydroxybenzotriazolylated when treated with low-valent titanium to give alkenes 4a-m, dienes 7a-j, and triene 11a, with selectivity for the trans isomers without separation of diastereoisomeric intermediates. This method offers an alternative to the three most frequently used methods for the formation of alkenes from carbonyl compounds-the Wittig, Peterson, and Julia reactions-especially in the formation of tri- and tetrasubstituted alkenes.
Irradiation-Induced Heck Reaction of Unactivated Alkyl Halides at Room Temperature
作者:Guang-Zu Wang、Rui Shang、Wan-Min Cheng、Yao Fu
DOI:10.1021/jacs.7b10009
日期:2017.12.20
eliminable β-hydrogen atoms. Whereas most palladium-catalyzed cross-coupling reactions utilize the ground-state reactivity of palladium complexes under thermal conditions and generally apply a single ligand system, we report that the palladium-catalyzedHeckreaction proceeds smoothly at room temperature with a variety of tertiary, secondary, and primary alkylbromides upon irradiation with blue light-emitting
5-Quinoline derivatives having an anti-bacterial activity
申请人:Dale Glenn
公开号:US20100324030A1
公开(公告)日:2010-12-23
The present invention describes novel anti-bacterial compounds of the formula (I).
These compounds are, amongst others, of interest as inhibitors of DNA gyrase and topoisomerases, for example of topoisomerase II and IV.
Xanthate-mediated synthesis of (<i>E</i>)-alkenes by semi-hydrogenation of alkynes using water as the hydrogen donor
作者:Xianglin Luo、Xiuwen Chen、Lu Chen、Kun Zhang、Yibiao Li
DOI:10.1039/c9cc00128j
日期:——
Semi-hydrogenation of alkynes is one of the most widely used methods for obtaining alkenes in laboratory preparation and in industry. Transition metal catalysts have been extensively studied for this transformation, but the tolerance of functional groups, such as pyridine, –OH, –NH2, –Bpin, and halides, and the toxicity of the trace amount of transition metal catalysts are still highly challenging
The present invention relates to a sulfonyl-substituted benzoheterocyclic derivative, a preparation method and medical use thereof. Particularly, disclosed is a compound of formula (I) or a pharmaceutically acceptable salt, stereoisomer, solvate, or prodrug thereof, and a preparation method and application thereof. The definition of each group in the formula can be found in the specification and the claims.