I2-Catalyzed Regioselective Oxo- and Hydroxy-acyloxylation of Alkenes and Enol Ethers: A Facile Access to α-Acyloxyketones, Esters, and Diol Derivatives
摘要:
I-2-catalyzed oxo-acyloxylation of alkenes and enol ethers with carboxylic acids providing for the high yield synthesis of a-acyloxyketones and esters is described. This unprecedented regioselective oxidative process employs TBHP and Et3N in stoichiometric amounts under metal-free conditions in DMSO as solvent. Additionally, I-2-catalysis allows the direct hydroxy-acyloxylation of alkenes with the sequential addition of BH3 center dot SMe2 leading to monoprotected diol derivatives in excellent yields.
Reactions of thallium(I) carboxylates and iodine with alkenes
作者:Richard C. Cambie、Rodney C. Hayward、John L. Roberts、Peter S. Rutledge
DOI:10.1039/p19740001858
日期:——
Treatment of an alkene with a thallium(I) carboxylate and iodine gives the corresponding vic-iodocarboxylate in high yield. The reactions are regiospecific and in conjunction with solvolysis of the products, offer an alternative to the Prévost reaction. Differences in the behaviour of thallium(I) carboxylates and silver carboxylates towards alkenes in the presence of iodine are discussed.
Thallium(<scp>I</scp>) carboxylates: a new class of reagents for the formation of α-iodocarboxylates
作者:Richard C. Cambie、Rodney C. Hayward、John L. Roberts、Peter S. Rutledge
DOI:10.1039/c39730000359
日期:——
Treatment of an alkene with a thallium(I) carboxylate and iodine gives the corresponding α-iodocarboxylate in high yield, thereby affording a regiospecific and inexpensive modification for the Prevost reaction.
Regioselective vicinal functionalization of unactivated alkenes with sulfonium iodate(<scp>i</scp>) reagents under metal-free conditions
作者:Dodla S. Rao、Thurpu R. Reddy、Kalvacherla Babachary、Sudhir Kashyap
DOI:10.1039/c6ob01179a
日期:——
Metal-free, molecular iodine-free direct 1,2-difunctionalization of unactivated alkenes has been reported. The sulfoniumiodate(I) reagent efficiently promoted the intermolecular vicinal iodo-functionalization of a diverse range of olefins in a stereo and regioselective manner. This method enables the divergent and straightforward preparation of synthetically useful functionalities; β-iodocarboxylates
formula R4N[I(O2CAr)2] is reported. These compounds are air‐ and moisture‐stable iodine(I) reagents, which were characterized including X‐ray analysis. They represent conceptually new iodine(I) reagents with anions as stabilizers. These compounds display the expected performance as electrophilic reagents upon interaction with electron‐rich substrates. The performance of these compounds in a total of
报道了通式为R 4 N [I(O 2 CAr)2 ]的亲电碘试剂的一般合成,分离和表征。这些化合物是空气和水分稳定的碘(I)试剂,其特征包括X射线分析。从概念上讲,它们代表带有阴离子作为稳定剂的新碘(I)试剂。这些化合物在与富电子底物相互作用时作为亲电子试剂显示出预期的性能。研究了这些化合物在烯烃的邻位碘加氧的总共47个不同反应中的性能,并揭示了该试剂的一些关键特征。