Rapid formation of diphenylmethyl ethers and thioethers using microwave irradiation and protic ionic liquids
作者:Jarrad M. Altimari、Joshua P. Delaney、Linden Servinis、Jennifer S. Squire、Megan T. Thornton、Simren K. Khosa、Benjamin M. Long、Mark D. Johnstone、Cassandra L. Fleming、Frederick M. Pfeffer、Shane M. Hickey、Matthew P. Wride、Trent D. Ashton、Bronwyn L. Fox、Nolene Byrne、Luke C. Henderson
DOI:10.1016/j.tetlet.2012.02.011
日期:2012.4
Using microwave irradiation and protic ionic liquids (pIL) as co-solvent and catalyst for the synthesis of several diphenylmethylethers was achieved. The desired ethers were isolated simply by filtration through a silica plug to remove the pIL and proceeded in high yields (60–98%). These reactions were extremely rapid (10–30 min) and occurred under mild conditions (80 °C). This protocol was also successfully
Aryl Boronic Acid Catalysed Dehydrative Substitution of Benzylic Alcohols for C−O Bond Formation
作者:Susana Estopiñá‐Durán、Liam J. Donnelly、Euan B. Mclean、Bryony M. Hockin、Alexandra M. Z. Slawin、James E. Taylor
DOI:10.1002/chem.201806057
日期:2019.3.12
substitution of benzylicalcohols with a second alcohol to form new C−Obonds. This method has been applied to the intermolecular substitution of benzylicalcohols to form symmetrical ethers, intramolecular cyclisations of diols to form aryl‐substituted tetrahydrofuran and tetrahydropyran derivatives, and intermolecular crossed‐etherification reactions between two different alcohols. Mechanistic control
Stereodivergent Intramolecular C(sp<sup>3</sup>)–H Functionalization of Azavinyl Carbenes: Synthesis of Saturated Heterocycles and Fused <i>N</i>-Heterotricycles
作者:Vincent N. G. Lindsay、Hélène M.-F. Viart、Richmond Sarpong
DOI:10.1021/jacs.5b04295
日期:2015.7.8
A general approach for the formation of five-membered saturated heterocycles by intramolecular C(sp(3))-H functionalization is reported. Using N-sulfonyltriazoles as Rh(II) azavinyl carbene equivalents, a wide variety of stereodefined cis-2,3-disubstituted tetrahydrofurans were obtained with good to excellent diastereoselectivityfrom readily available acyclic precursors. The reaction is shown to be