Pd-Catalyzed Oxidative Heck Reaction of Grignard Reagents with Diaziridinone as Oxidant
作者:Qipu Dai、Baoguo Zhao、Yihui Yang、Yian Shi
DOI:10.1021/acs.orglett.9b01762
日期:2019.7.5
A novel Pd-catalyzed oxidative Heckreaction with readily available Grignard reagents using di-t-butyldiaziridinone as an oxidant has been developed. Various substituted olefins were obtained in 46–91% yields with high regioselectivity under mild reaction conditions.
Metal trifluoromethanesulfonates [M(OTf)n;
M = Sc, Zr, In] catalyse the FriedelâCrafts alkenylation of arenes
using alkynes, including internal alkynes, to give, through an alkenyl
cation intermediate, 1,1-diarylalkenes in high to excellent yields.
金属三氟甲磺酸盐[M(OTf)n; M = Sc, Zr, In]可催化炔类(包括内部炔类)与炔烃的弗里德卡夫斯烯化反应,通过烯阳离子中间体以高产率甚至极高的产率得到 1,1-二芳基烯烃。
Heterocyclic carboxylic acids
申请人:Novo Nordisk A/S
公开号:US05198451A1
公开(公告)日:1993-03-30
Novel N-substituted azaheterocyclic carboxylic acids and esters thereof in which a substituted alkyl chain forms part of the N-substituent, the compounds thus having the general formula I ##STR1## wherein Y is ##STR2## wherein R.sup.1 and R.sup.2 independently are C.sub.3-8 cycloalkyl phenyl or thienyl all of which may be optionally substituted with halogen, trifluoromethyl, C.sub.1-16 alkyl or C.sub.1-6 alkoxy; s is 1, 2 or 3; x is --CH.sub.2 --, --O-- or ##STR3## -wherein R.sup.3 is hydrogen or C.sub.1-6 -alkyl; r is 2, 3 or 4; R.sup.4 and R.sup.5 each represents hydrogen or may together represent a bond and R.sup.6 is OH or C.sub.1-8 -alkoxy; and pharmaceutically acceptable acid addition salts are potent inhibitors of GABA uptake from the synaptic cleft.
Introduction of a substituent into ortho-position of β-aryl group in a vinyl bromide resulted in the preferential formation of a vinyl cation in the photolysis. It is considered that the steric repulsion of β-aryl groups makes a convenient conformation for an electron transfer from the aromatic ring to the halogen atom in the radical pair.