Palladium-Catalyzed Oxime Assisted Intramolecular Dioxygenation of Alkenes with 1 atm of Air as the Sole Oxidant
摘要:
This paper describes a palladium-catalyzed oxime assisted intramolecular dioxygenation of alkenes by using 1 atm of air as the sole oxidant under extremely mild conditions, which demonstrated the feasibility of incorporating atmospheric oxygen into synthetically useful products under 1 atm of air at room temperature.
From allylic alcohols to saturated carbonyls using Fe(CO)5 as catalyst: scope and limitation studies and preparation of two perfume components
作者:Hassan Cherkaoui、Mohammed Soufiaoui、René Grée
DOI:10.1016/s0040-4020(01)00114-4
日期:2001.3
The direct conversion of allylicalcohols to saturated carbonyls, using Fe(CO)5 as a catalyst, offers good synthetic potential. Mono-, di- and even trisubstituted alkenes bearing various alkyl, aryl and electronwithdrawing groups on the allylic system give good to excellent yields of rearranged products. Limitations occur mainly with polyunsaturated derivatives. This reaction was applied to a short
Palladium- and Platinum-Catalyzed Addition of Aldehydes and Imines with Allylstannanes. Chemoselective Allylation of Imines in the Presence of Aldehydes
Pd(II) or Pt(II) complexes (10 mol %) either at room temperature or at reflux, giving the corresponding homoallylic alcohols 3 in high to good yields. Among the catalysts examined, PtCl2(PPh3)2 gave the best result. No only allyltribitylstannane but also methallyl- and crotyltributylstannane could be utilized in this transition metal catalyzed reaction. Detailed mechanistic studies of the Pd(II)-catalyzed
Asymmetric synthesis via chiral silicon reagents. Chiral α-hydroxyalkyl anion equivalents from vinylsilanes containing optically active amino or alkoxy groups on silicon
作者:Kohei Tamao、Ryuichiro Kanatani、Makoto Kumada
DOI:10.1016/s0040-4039(01)90074-7
日期:1984.1
Chiral vinylsilanes containing optically active functional groups on silicon have been used as precursors for chiral α-hydroxyalkyl anionequivalents via a sequence of addition of η-butyllithium, coupling with organic halides, and oxidative cleavage of the silicon-carbon bond, to give optically active alcohols of up to 60% ee.
Synthesis and Reactivity of 1,2-Dioxolanes from β,γ-Epoxy Ketones
作者:Wynne V. Kandur、Kathleen J. Richert、Curtis J. Rieder、Andrew M. Thomas、Chunhua Hu、Joseph W. Ziller、K. A. Woerpel
DOI:10.1021/ol500835f
日期:2014.5.16
readily accessible β,γ-epoxy ketones and H2O2. The reaction proceeded via a tetrahydrofuran, which was converted to the thermodynamically favored 1,2-dioxolane. The product contains a leaving group, which can be displaced to synthesize analogues of the plakinicacid natural products.
一步法制得的五元环过氧化物是由易于获得的β,γ-环氧酮和H 2 O 2以31–86%的产率制备的。反应通过四氢呋喃进行,将其转化为热力学上有利的1,2-二氧戊环。该产物含有离去基团,该离去基团可以被取代以合成邻苯二酸天然产物的类似物。
Palladium- and platinum-catalysed addition of aldehydes with allylstannanes
The reaction of allylic stannanes 1 with aldehydes 2(or a ketone) takes place in the presence of catalytic amounts of PdCl2(PPh3)2 or PtCl2(PPh3)2 to give the corresponding homoallyl alcohols 3 in good to high yields.