Highly Productive α-Alkylation of Ketones with Alcohols Mediated by an Ir–Oxalamidato/Solid Base Catalyst System
作者:Hideo Shimizu、Hironori Maeda、Hideki Nara
DOI:10.1021/acs.oprd.0c00362
日期:2020.11.20
An Ir–oxalamidato complex in combination with a solid base (e.g., magnesium aluminometasilicate/Ca(OH)2) significantly improved the catalyst productivity in α-alkylation of methyl ketones with primary alcohols. Optimization through systematic variation of the oxalamidato ligand led to a practical turnover number (TON) of 10 000–40 000.
The present invention relates to: a method for converting a hydroxyl group of an alcohol; and a catalyst which makes the method possible. A method for converting a hydroxyl group of an alcohol according to the present invention is characterized by producing a compound represented by CH(R
1
)(R
2
)Nu (wherein R
1
, R
2
and Nu are as defined below) by reacting an alcohol represented by CH(R
1
)(R
2
)OH (wherein each of R
1
and R
2
represents a hydrogen atom, an optionally substituted alkyl group, or the like) and a compound having an active proton, which is represented by H-Nu (wherein Nu represents a group represented by —CHX
1
-EWG
1
or —NR
3
R
4
; X
1
represents a hydrogen atom or the like; EWG
1
represents an electron-withdrawing group; and each of R
3
and R
4
represents a hydrogen atom, an optionally substituted alkyl group, or the like), with each other in the presence of a complex of a group 7-11 metal of the periodic table and at least one solid base that is selected from the group consisting of layered double hydroxides, composite oxides and calcium hydroxide.