Half-sandwich scandium catalysts serve as a unique platform for the regio- and diastereoselective [3+2] annulation of aliphaticaldimines with alkenes via β-C(sp3)−Hactivation, affording a new family of multi-substituted aminocyclopentane derivatives from easily accessible aldimines and alkenes with broad substrate scope, high regio-, diastereoselectivity and 100 % atom-efficiency.
Single operation palladium catalysed C(sp<sup>3</sup>)–H functionalisation of tertiary aldehydes: investigations into transient imine directing groups
作者:S. St John-Campbell、A. J. P. White、J. A. Bull
DOI:10.1039/c7sc01218g
日期:——
Simple amine and diamine derivatives can promote the palladium catalysed direct β-C–H arylation of aliphatic aldehydes via transient imine formation. Trifluoroacetate was shown to be crucial in promoting the reaction. Sub-stoichiometric quantities of simple N-tosylethylenediamine was shown to form a bidentate directing group with an imine linkage. Isolation of an unsymmetrical palladacycle has shown
The present invention relates to ester, ether and N-alkylcarbamoyl derivatives of compound (Ia) and pharmaceutically acceptable salts thereof. These compounds exhibit excellent antibacterial activity and are useful for the treatment or prevention of bacterial infections.
1
(wherein R
1
is a hydrogen atom or a methyl group; R
2
a
is a hydrogen atom, a protecting group for a hydroxy group, or a methyl group; R
3
is a hydrogen atom or a protecting group for a hydroxy group; R
4
a
is a hydrogen atom, a hydroxy group or a protected hydroxy group; R
5
is a hydrogen atom or a protecting group for a hydroxy group; and X is a methylene group or a sulfur atom). The invention also includes compounds which are related to the aforeidentified compounds.
2, 6-dimethyl octylformate and an attractant of tribolium castaneum herbst
申请人:Japan Tobacco Inc.
公开号:EP0284363A1
公开(公告)日:1988-09-28
According to the present invention, an attractant that possesses attraction effects with respect to Tribolium castaneum Herbst and moreover, is a stable compound for which the effectiveness will be continuous, is provided.
That is, the present invention is 2,6-dimethyl octylformate and an attractant of Tribolium castaneum Herbst which is formed from relevant chemical compounds.
The present invention relates to ester, ether and N-alkylcarbamoyl derivatives of compound (Ia) and pharmaceutically acceptable salts thereof. These compounds exhibit excellent antibacterial activity and are useful for the treatment or prevention of bacterial infections.
(wherein R1 is a hydrogen atom or a methyl group; R2a is a hydrogen atom, a protecting group for a hydroxy group, or a methyl group; R3 is a hydrogen atom or a protecting group for a hydroxy group; R4a is a hydrogen atom, a hydroxy group or a protected hydroxy group; R5 is a hydrogen atom or a protecting group for a hydroxy group; and X is a methylene group or a sulfur atom).