Directed ortho Metalation Reactions of Aryl O-Carbamates; A Regiospecific Synthesis of 2,2-Disubstituted 2H-1-Benzopyrans
作者:Brian A. Chauder、Alexey V. Kalinin、Victor Snieckus
DOI:10.1055/s-2001-9747
日期:——
A one-pot regiocontrolled synthesis of 2,2-disubstituted 2H-1-benzopyrans 5 from aryl O-carbamates 4 using the directed ortho metalation reaction is described and constitutes an advantageous complement to classical routes for this class of heterocycles.
MAGNESIUM DICHLORIDE-ETHANOL ADDUCTS AND CATALYST COMPONENT OBTAINED THEREFROM
申请人:BASELL POLIOLEFINE ITALIA S.R.L.
公开号:US20150266981A1
公开(公告)日:2015-09-24
Catalyst component for the polymerization of olefins comprising Mg, Ti and an electron donor of formula (I)
Where R
1
and R
2
, independently, are selected from hydrogen and C
1
-C
15
hydrocarbon groups, optionally contain an heteroatom selected from halogen, P, S, N, O and Si, which can be fused together to form one or more closed cycles and A is a bivalent bridging group.
Snieckus, Victor, Bulletin de la Societe Chimique de France, 1988, # 1, p. 67 - 78
作者:Snieckus, Victor
DOI:——
日期:——
Nickel(0)-catalyzed cross coupling of aryl O-carbamates and aryl triflates with Grignard reagents. Directed ortho metalation-aligned synthetic methods for polysubstituted aromatics via a 1,2-dipole equivalent
The first Ni(0)-catalyzed cross-coupling reactions of aryl O-carbamates and aryl triflates with Grignard reagents (Scheme I) to give diversely polysubstituted aromatics 2d and 2e (Table I) which feature regiospecificity based on directed ortho metalation (carbamate), minimal beta-hydride elimination (triflate), and dependence on steric and electronic effects are described.
MAGNESIUM DICHLORIDE-ETHANOL ADDUCTS AND CATALYST COMPONENTS OBTAINED THEREFROM