Palladium(0) catalyzed coupling oftrans-1,2-Bis(tri-n-butylstannyl)ethylene with aromatic halides: a convenient Synthesis of substitutedtrans-β-bromostyrenes
作者:Richard A. Haack、Thomas D. Penning、Stevan W. Djurić、John A. Dziuba
DOI:10.1016/0040-4039(88)85208-0
日期:1988.1
trans-β-Bromostyrenes have been conveniently prepared in moderate to high yield in a one-pot two-step sequence.trans-1,2-Bis(tri-n-butylstannyl)ethylene underwent a smooth palladium(0) catalyzed coupling reaction with 0.5 equivalents of aromatic bromide or iodide to furnish atrans-β-stannylstyrene. This intermediate vinyl stannane, without isolation, was then converted to the substitutedtrans-bromostyrene on
Nickel(II)-Magnesium-Catalyzed Cross-Coupling of 1,1-Dibromo-1-alkenes with Diphenylphosphine Oxide: One-Pot Synthesis of (<i>E</i>)-1-Alkenylphosphine Oxides or Bisphosphine Oxides
A novel nickel(II)‐magnesium‐mediated cross‐coupling of diphenylphosphine oxide with a variety of 1,1‐dibromo‐1‐alkenes has been developed, which provides a powerful and general methodology for the stereoselectivesynthesis of various (E)‐1‐alkenylphosphine oxides or bisphosphine oxides, with operational simplicity of the procedure, good to high yields and broad substrate applicability. Mechanistic
The first Pd-catalyzed multicomponent reaction of aryl iodides, alkenyl bromides, and strained alkenes has been developed, which allowed us to synthesize a variety of multisubsituted olefins in yields of 45–96% with excellent stereoselectivity. The configuration of the product was controlled by the configuration of the alkenyl bromides. Moreover, this practical methodology employing readily available
[reaction: seet text] Two synthetic routes to several (Z)-polyaromatic and heteroaromatic substituted vinylacetylenes are described. The nature of aryl- or heteroaryl-substituted carboxaldehyde used as starting material dictated the choice of Wittig salt employed. A very attractive way to construct polyaromatic and pyridine-containing enynes is the reaction of polyaromatic and pyridine-containing aldehydes
Method for the synthesis of 3-substituted indolizine and benzoindolizine compounds
申请人:Hayford Anthony
公开号:US20060160770A1
公开(公告)日:2006-07-20
A method of making a compound of Formula I:
comprises reacting a compound of Formula II
with a compound such as R
1
OH or R
1
SH, to produce said compound of Formula I. Compounds of Formula I are useful, among other things, as dyes, spectral sensitizers, glycosidase inhibitors, and as antibacterial, antiviral, and anti-inflammatory agents.