Disclosed is a compound represented by formula (1) or a pharmacologically acceptable salt thereof (In the formula, A represents a group that is represented by formula (A-1); R
1a
and R
1b
may be the same or different and each independently represents a C
1-6
alkyl group which may be substituted by one to three halogen atoms; m and n each independently represents an integer of 0-5; X
1
represents a hydroxyl group or an aminocarbonyl group; Z
1
represents a single bond or the like; and R
2
represents an optionally substituted C
1-6
alkyl group, an optionally substituted C
6-10
aryl group or the like.)
Regioselective Iridium-Catalyzed Asymmetric Monohydrogenation of 1,4-Dienes
作者:Jianguo Liu、Suppachai Krajangsri、Thishana Singh、Giulia De Seriis、Napasawan Chumnanvej、Haibo Wu、Pher G. Andersson
DOI:10.1021/jacs.7b06829
日期:2017.10.18
A highly efficient regio- and enantioselective monohydrogenation of 1,4-dienes has been realized using an iridium catalyst with a chiral N,P-ligand under mild conditions. The substrate scope was studied and included both unfunctionalized as well as functionalized substituents on the meta- or para-position. Substrates having substituents with functionalities such as silyl protected alcohols or ketals
Selective removal of phenolic and alcoholic silyl ethers
作者:Chandra Prakash、Samir Saleh、Ian A. Blair
DOI:10.1016/s0040-4039(00)78344-4
日期:1994.10
Potassium carbonate/Kriptofix 222 and pyridinium p-toluenesulfonate or BF3-etherate have been found to remove the tert-butyldimethylsilyl group from phenolic and alcoholic silylethers, respectively. This methodology should find wide applicability in complex organic synthesis.