Hydrophobically Directed Selective Reduction of Ketones
作者:Mark R. Biscoe、Ronald Breslow
DOI:10.1021/ja0379924
日期:2003.10.1
extreme case, there was a 40-fold selectivity reversal. Lithiumborohydride showed no such change in selectivity and favored acetyl reduction in both solvents. Salt and cosolvent effects indicate that hydrophobic packing is involved in the reaction of hydrophobic reagents with the aryl ketones. Some special interaction of the pentafluorophenyl group with aryl rings was also detected.
2-oxo-acetamidines from methyl ketones using aromatic amines and DMF as nitrogen sources is reported via copper-catalyzedC(sp3)–H amidination. Various methyl ketones react readily with aromatic amines and DMF, producing 2-oxo-acetamidines in yields of 47 to 92%. This protocol features the simultaneous formation of C–N and CN bonds using DMF and aromatic amines as two different nitrogen sources. It
A facile and mild reduction procedure is reported for the preparation of chiral secondary alcohols prepared from α-substituted ketones using sodium borohydride and the chiral boronate ester (l)-TarB-NO2. Direct reduction of substituted ketones bearing Lewis basic heteroatoms generally provided secondary alcohols of only modest enantiomeric excess likely due to either competition between the target
An acrylic ester compound represented by the general formula (1):
1
wherein, R
1
and R
2
represent independently a hydrogen atom, an alkyl group which may have a substituent, an aromatic alkyl group which may have a substituent or an aromatic residue which may have a substituent, respectively; R
3
represents a hydrogen atom or an alkyl group; A represents a divalent organic group; and X represents a sulfur atom or an oxygen atom; provided that when X is an oxygen atom, R
1
represents an aromatic residue that may have a substituent, a polymerizable composition comprising the compound, and a cured article and optical components obtained by polymerizing the polymerizable composition.
A nickel-catalyzed, efficient C-N bond reduction of aromatic and benzylic ammonium triflates has been developed using sodium isopropoxide as a reducing agent. The high efficiency, mild conditions, and nice compatibility...