Synthesis and Use of α-Silyl-Substituted α-Hydroxyacetic Acids
摘要:
Rhodium-catalyzed oxygen transfer was used to generate benzyl 2-sifyi-2-oxoacetates in good yields. The hydrogenation of these compounds led to chiral alpha-silyl-substituted a-hydroxyacetic acids. Resolution by means of HPLC using a chiral stationary phase afforded an enantiomerically pure representative of this class of compounds, which was successfully applied as a chiral ligand in an asymmetric aldol-type reaction.
2,3-BISPHOSPHINOPYRAZINE DERIVATIVE, METHOD FOR PRODUCING SAME, TRANSITION METAL COMPLEX, ASYMMETRIC CATALYST, AND METHOD FOR PRODUCING ORGANIC BORON COMPOUND
申请人:Nippon Chemical Industrial Co., Ltd.
公开号:US20210047351A1
公开(公告)日:2021-02-18
Provided is a 2,3-bisphosphinopyrazine derivative represented by the following general formula (1), wherein R
1
, R
2
, R
3
, and R
4
represent an optionally substituted straight-chain or branched alkyl group having 1 to 10 carbon atoms, an optionally substituted cycloalkyl group, an optionally substituted adamantyl group, or an optionally substituted phenyl group, R
5
represents an optionally substituted alkyl group having 1 to 10 carbon atoms or an optionally substituted phenyl group, each R
5
may be the same group or a different group, R
6
represents a monovalent substituent, n denotes an integer of 0 to
The efficient method for the preparation of alkenylsilanes from organoaluminums
作者:Rita N. Kadikova、Tat'yana P. Zosim、Usein M. Dzhemilev、Ilfir R. Ramazanov
DOI:10.1016/j.jorganchem.2014.04.004
日期:2014.8
aluminacyclopentanes takes place on the less sterically hinderedreaction center. Using electron-donating solvents (diethyl ether, THF) inhibits the reaction. A new convenient procedure of silylation was developed, which consists in obtaining the silyl tosylate by the reaction of chlorosilanes with anhydrous sodium tosylate in toluene solution. The resulting reaction mixture was reacted with organoaluminum compounds
Synthesis and reactions of silanes containing two triflate groups
作者:K. Matyjaszewski、Y.L. Chen
DOI:10.1016/0022-328x(88)80546-1
日期:1988.2
been prepared via displacement of phenyl, chloro, and methyl groups in the corresponding mono- and di-silanes. Phenyl groups are displaced more rapidly than chloro and methyl groups. The unreacted groups are strongly deactivated by the presence of a triflate group at the same silicon atom. The deactivation is much weaker when a triflate group is present at the adjacent silicon atom. Alcohols and amines
Silver triflate, either alone or in the presence of an appropriate phosphine or NHC ligand, has been shown to catalyze the chemoselective hydrosilylation of aromatic and aliphatic aldehydes to yield silyl ethers, thus representing the first systematic application of silver species as catalysts for the hydrosilylation of unsaturated organic substrates.
Terminal Iron Carbyne Complexes Derived from Arrested CO
<sub>2</sub>
Reductive Disproportionation
作者:Charles C. Mokhtarzadeh、Curtis E. Moore、Arnold L. Rheingold、Joshua S. Figueroa
DOI:10.1002/anie.201705877
日期:2017.8.28
reacts with two molecules of CO2 to effectreductive disproportionation to CO and carbonate ([CO3]2−). When the reaction is performed in the presence of silyl triflates, reductive disproportionation is arrested by silylative esterification of a mono-CO2 adduct. This results in the formation of four-coordinate terminal iron carbynes possessing an aryl carbamate substituent owing to the direct attachment