Despite the widespread use of transition-metal catalysts in organic synthesis, transition-metal-catalyzed reactions of organosulfur compounds, which are known as catalyst poisons, have been difficult. In particular, the transition-metal-catalyzed addition of organosulfur compounds to unactivated alkenes remains a challenge. A novel gold-catalyzed hydrothiolation of unactivated alkenes is presented, which
Dehydroxylation of alcohols for nucleophilic substitution
作者:Jia Chen、Jin-Hong Lin、Ji-Chang Xiao
DOI:10.1039/c8cc03856b
日期:——
The Ph3P/ICH2CH2I system-promoted dehydroxylative substitution of alcohols was achieved to construct C–O, C–N, C–S and C–X (X = Cl, Br, and I) bonds. Compared with the previous approaches such as the Appel reaction and Mitsunobu reaction, this protocol offers some practical advantages such as safe operation and a convenient amination process.
通过Ph 3 P / ICH 2 CH 2 I系统促进的醇的脱羟基取代反应,可构建C–O,C–N,CS–S和C–X(X = Cl,Br和I)键。与之前的方法(如Appel反应和Mitsunobu反应)相比,该方案具有一些实用的优点,例如操作安全和便捷的胺化过程。
Alkyl Sulfides as Promising Sulfur Sources: Metal-Free Synthesis of Aryl Alkyl Sulfides and Dialkyl Sulfides by Transalkylation of Simple Sulfides with Alkyl Halides
A site‐selective metal‐free dealkylative approach to synthesize aryl alkyl and symmetrical dialkyl sulfides has been developed. This procedure is convenient and has wide functional group tolerance giving rise to sulfides carrying various alkyl chains from simple alkyl sulfides and alkyl halides in good to excellent yields. This transalkylation proceeds by an ionic mechanism via sulfonium intermediates
Nickel-Catalyzed C–S Reductive Cross-Coupling of Alkyl Halides with Arylthiosilanes toward Alkyl Aryl Thioethers
作者:Yu-Zhong Yang、Yang Li、Gui-Fen Lv、De-Liang He、Jin-Heng Li
DOI:10.1021/acs.orglett.2c01954
日期:2022.7.22
A nickel-catalyzed C–S reductive cross-coupling of alkyl halides with arylthiosilanes for producing alkyl arylthioethers is developed. This reaction is initiated by umpolung transformations of arylthiosilanes followed by C–S reductive cross-coupling with alkyl halides to manage an electrophilic alkyl group onto the electrophilic sulfur atom and then construct a C(sp3)–S bond, and features exquisite
probably proceeds via Dexter energy transfer between the activated catalyst and the Barton ester. Furthermore, a one-pot wavelength-selective reaction within the visible light range is developed in combination with a blue-light-mediated photoredox reaction, demonstrating the compatibility of two photochemical transformations based on mechanistic differences. This one-pot process expands the limits of the