Tandem Dienone Photorearrangement–Cycloaddition for the Rapid Generation of Molecular Complexity
摘要:
A tandem dienone photorearrangement-cycloaddition (DPC) reaction of novel cyclohexadienone substrates tethered with various 2 pi and 4 pi reaction partners resulted in the formation of polycyclic, bridged frameworks. In particular, use of alkynyl ether-tethered substrates led to (3 + 2) cycloaddition to afford strained alkenes which could be further elaborated by intra- and intermolecular cycloaddition chemistry to produce complex, polycyclic chemotypes.
Preparation of Silica Supported Tin Chloride: As a Recyclable Catalyst for the Silylation of Hydroxyl Groups with HMDS
作者:Khodabakhsh Niknam、Mohammad Ali Zolfigol、Dariush Saberi、Hajar Molaee
DOI:10.1002/jccs.200900181
日期:2009.12
Silica‐supportedtinchloride [SiO2‐Sn(Cl)4‐n] has been prepared by mixing tinchloride with activated silica gel in toluene under refluxing conditions for one day. A range of primary, secondary, and tertiary alcohols as well as phenolic hydroxylgroups were converted into their corresponding trimethylsilyl ethers with hexamethyldisilazane in the presence of catalytic amounts of silica‐supported tin
Silica-bonded<i>S</i>-sulfonic acid as a recyclable catalyst for the silylation of hydroxyl groups with hexamethyldisilazane (HMDS)
作者:Khodabakhsh Niknam、Dariush Saberi、Hajar Molaee、Mohammad Ali Zolfigol
DOI:10.1139/v09-162
日期:2010.2
Silica-bonded S-sulfonic acid (SBSSA) was prepared by the reaction of 3-mercaptopropylsilica (MPS) and chlorosulfonic acid in tert-butylmethyl ether, and used as a catalyst for the silylation of hy...
Highly atom economical uncatalysed and I2-catalysed silylation of phenols, alcohols and carbohydrates, using HMDS under solvent-free reaction conditions (SFRC)
作者:Marjan Jereb
DOI:10.1016/j.tet.2012.03.040
日期:2012.5
An uncatalysed silylation of phenols, regardless on the aggregate state and nature of the substituents with 0.55 equiv of HMDS under solvent-free reaction conditions (SFRC) at room temperature is reported. Sterically hindered phenols, carbohydrates and most of the alcohols additionally required a catalytic amount (up to 2 mol%) of iodine. The reaction protocol is very simple; obtaining a pure product, particularly of uncatalysed reactions, was frequently a completely solvent-free process. (C) 2012 Elsevier Ltd. All rights reserved.
Oxyfunctionalization of hydrocarbons. 14. Electrophilic hydroxylation of aromatics with bis(trimethylsilyl) peroxide/triflic acid
作者:George A. Olah、Thomas D. Ernst
DOI:10.1021/jo00266a041
日期:1989.3
OLAH, GEORGE A.;ERNST, THOMAS D., J. ORG. CHEM., 54,(1989) N, C. 1204-1206