Solid Phase Approaches to <i>N</i>-Heterocycles Using a Sulfur Linker Cleaved by SmI<sub>2</sub>
作者:Laura A. McAllister、Kristy L. Turner、Stephen Brand、Mark Stefaniak、David J. Procter
DOI:10.1021/jo060940n
日期:2006.8.1
A sulfur HASC (α-hetero-atom substituted carbonyl) linker has been utilized in solid-phase approaches to oxindoles and tetrahydroquinolones. The route to oxindoles employs the first Pummerer cyclizations on solidphase, whereas the route to tetrahydroquinolones involves a microwave-assisted Heck reaction followed by a Michael cyclization. In both cases, the linker is cleaved in a traceless fashion
The first Pummerer cyclisations on solid phase. Convenient construction of oxindoles enabled by a sulfur-link to resin
作者:Laura A. McAllister、Stephen Brand、R�my de Gentile、David J. Procter
DOI:10.1039/b307586a
日期:——
α-Sulfanyl N-aryl acetamides, attached to resin via the sulfur atom, undergo efficient Pummerer cyclisation upon activation of the sulfur link, to give oxindoles; heterocyclic products can be cleaved from the resin in a traceless manner using samarium(II) iodide.
3-perfluoroalkyl-5-substituted-oxy-isoxazole derivatives, process for
申请人:Shionogi & Co., Ltd.
公开号:US04888044A1
公开(公告)日:1989-12-19
A novel herbicidal compound of the formula: ##STR1## in which R is OH, C.sub.1 -C.sub.3 alkoxy or R.sup.3 -N-R.sup.4 ; R.sub.f is C.sub.1 -C.sub.3 perfluoroalkyl; R.sup.1 is hydrogen, C.sub.1 -C.sub.6 alkyl or optionally substituted phenyl; R.sup.2 is hydrogen or C.sub.1 -C.sub.3 alkyl; n is an integer of 0 to 2; R.sup.3 is hydrogen or C.sub.1 -C.sub.3 alkyl; R.sup.4 is C.sub.1 -C.sub.6 alkyl, optionally substituted phenylalkyl where alkyl contains 1 to 3 carbons or optionally substituted phenyl; or R.sup.3 and R.sup.4 together with the nitrogen atom to which they are attached form a cyclic amino group; or a salt thereof. A process for preparing the compound (I) and a herbicide containing the compound (I) are also disclosed.
3-Perfluoroalkyl-isoxazol-5-yl-oxycarboxylic acid derivatives, processes for their preparation and their use as herbicides
申请人:SHIONOGI SEIYAKU KABUSHIKI KAISHA
trading under the name of
SHIONOGI & CO. LTD.
公开号:EP0271975A1
公开(公告)日:1988-06-22
A compound of the formula:
in which R is OH, C₁-C₃ alkoxy or R³-N-R⁴; Rf is C₁-C₃ perfluoroalkyl; R¹ is hydrogen, C₁-C₆ alkyl (including cycloalkyl) or optionally substituted phenyl; R² is hydrogen or C₁-C₃ alkyl; n is an integer of 0 to 2; R³ is hydrogen, C₁-C₆ alkyl (including cycloalkyl) or C₁-C₆ alkenyl; R⁴ is C₁-C₆ alkyl (including cycloalkyl), optionally substituted phenylalkyl where the alkyl moiety contains 1 to 3 carbons, optionally substituted phenyl or (C₁-C₃)alkoxycarbonyl (C₁-C₃) alkyl; or R³ and R⁴ together with the nitrogen atom to which they are attached form a cyclic amino group, the compound optionally being as a salt thereof.
Processes for preparing the compound (I) and herbicides containing the compound (I) are also disclosed.