Bringing “N” into the game: The direct chemoselective nitrogenation of unactivated alkenes can be achieved through oxidative selenium catalysis (see scheme). This method provides a broad variety of allylic imides in yields of up to 89 % using N‐fluorobenzenesulfonimide (NFSI) as the terminal oxidant and nitrogen source. Furthermore, an unprecedented selenium‐catalyzed vinylic C(sp2)–H nitrogenation
A new metal-free catalysis protocol for the oxidative coupling of nonactivated alkenes with simple carboxylic acids has been established. This method is predicated on the cooperative interaction of a diselane and a photoredox catalyst, which allows for the use of ambient air or pure O2 as the terminal oxidant. Under the title conditions, a range of both functionalized and nonfunctionalized alkenes
A NEW SYNTHETIC ROUTE OF β-HYDROXYALKYLPHOSPHONATES FROM β,γ-EPOXYALKYLPHOSPHONATES
作者:Toshio Nagase、Takayuki Kawashima、Naoki Inamoto
DOI:10.1246/cl.1984.1997
日期:1984.11.5
β-Hydroxyalkylphosphonates were synthesized from β,γ -epoxyalkylphosphonates and RMgX/ cat. CuI reagents, which is a new synthetic route for the various types of α- and/or γ-substituted β-hydroxyalkylphosphonates.
The catalytic acetoxylation of dialkyl allyl phosphonates with the Pd(OAc)2/benzoquinone/MnO2/HOAc system leads, regioselectively, to dialkyl 3- acetoxy 1-alkenyl phosphonates. On the basis of the regio- and stereoselectivity of the reaction, a mechanism is proposed which involves a (π-allyl) palladium complex as intermediate.
Unusual and efficient (Z)-stereoselective peterson synthesis of 2-diethoxyphosphonyl-1-alkoxy-3-methylpenta-1,3-dienes. Their use in the diels-alder reaction
The lithiated anion of diethyl α-trimethylsilyl-prenylphosphonate, readily in situgenerated from diethyl prenylphosphonate, reacts smoothly with various alkyl formates to give the title compounds with exclusive 1-(Z)-geometry and in high isolated yield. The [4 + 2] cycloaddition reaction of dienes 3 with electron-deficient dienophiles is described.