A one-pot “back-to-front” approach for the synthesis of benzene ring substituted indoles using allylboronic acids
作者:Ganesh Karan、Samrat Sahu、Modhu Sudan Maji
DOI:10.1039/d1cc01512e
日期:——
Synthesis of only benzene ring functionalized indoles and poly-substituted carbazoles is reported via a one-pot triple cascade benzannulation protocol. Usage of differently substituted and readily accessible allylboronic acids as a 3-carbon annulating partner enables diverse aliphatic and aromatic substitution patterns, which is still a daunting task. This scalable synthetic protocol tolerates broad
Conversion of α acetylenic alcohols into αβ unsaturated aldehydes
作者:Marc Julia、Christian Lefebvre
DOI:10.1016/s0040-4039(00)99836-8
日期:1984.1
Very mild conditions have been found for the efficient regioselective addition of phenylthiol to ethynyl carbinols. A biphasic aqueous acid hydrolysis then leads to α,β-unsaturated aldehydes. The Meyer-Schuster rearrangement is thus brought about in two steps.
Free Radical Addition of Thiophenol to 3-Substituted 1-Alkyne with or without Migration of the Substituents
作者:Hideyoshi Miyake、Kimiaki Yamamura
DOI:10.1246/bcsj.61.3752
日期:1988.10
Thiophenol reacts with 3-phenylthio- and 3-bromo-1-alkyne in the presence of radical initiator to give 1,2-bis(phenylthio)-1-alkene and 2-bromo-1-phenylthio-1-alkene.
Synthesis of vinyl sulfides using glycerol as a recyclable solvent
作者:Eder J. Lenardão、Márcio S. Silva、Renata G. Lara、Júnior M. Marczewski、Maraisa Sachini、Raquel G. Jacob、Diego Alves、Gelson Perin
DOI:10.3998/ark.5550190.0012.222
日期:——
alkynes promoted by KF/Al2O3, usingglycerol as recyclablesolvent. This improved method furnishes selectively the corresponding anti-Markovnikov vinylsulfides in good to excellent yields starting from terminal alkynes and aliphatic or aromatic thiols. The irradiation with microwaves facilitated the procedure and accelerates the reaction. The catalytic system and the glycerol can be re-used up to four
proceeded smoothly using stoichiometric amounts of BuLi. Both aminolithiation and carbolithiation were in equilibrium at room temperature, and the stereochemistry of the cyclization was thermodynamically controlled. At –78 °C the reaction was kineticallycontrolled and the cyclized product, 1,2-disubstituted octahydroindolizine, was obtained with good diastereoselectivity.
使用化学计量量的 BuLi,带有乙烯基硫化物部分的氨基烯烃的氨基锂化 - 碳锂化串联环化可以顺利进行。氨基锂化和碳锂化在室温下均处于平衡状态,环化的立体化学受热力学控制。在–78 °C 时,反应受到动力学控制,并以良好的非对映选择性获得环化产物 1,2-二取代八氢茚茚。