Stereospecific palladium-catalyzed 1,4-acetoxychlorination of 1,3-dienes
作者:Jan-E. Bäckvall、Ruth E. Nordberg、Jan-E. Nyström
DOI:10.1016/s0040-4039(00)87173-7
日期:1982.1
Palladium-catalyzed oxidation of 1,3-dienes in acetic acid in the presence of LiCl and LiOAc produces 1-acetoxy-4-chloro-2-alkenes in high selectivity. The 1,4-adducts were stereo- and regioselectively functionalized.
Preparation and Reactivities of (η<sup>3</sup>-1- and 2-Trimethylsiloxyallyl)Fe(CO)<sub>2</sub>NO Complexes. Intermediates Functioning as Equivalents of β- and α-Acyl Carbocations and Acyl Carbanions
作者:Keiji Itoh、Saburo Nakanishi、Yoshio Otsuji
DOI:10.1246/bcsj.64.2965
日期:1991.10
(η3-1- and 2-Trimethylsiloxyallyl)Fe(CO)2NO complexes were prepared by the reaction of the corresponding siloxyallylic halides with Bu4N[Fe(CO)3NO]. These complexes reacted with both of carbon nucleophiles and carbon electrophiles preferentially at the less hindered sites of the allylic ligands. In these reactions, (η3-1-trimethylsiloxyallyl)Fe(CO)2NO complexes served as synthetically equivalent synthons
Regiocontrol in palladium-catalysed allylic alkylation by addition of lithium iodide
作者:Motoi Kawatsura、Yasuhiro Uozumi、Tamio Hayashi
DOI:10.1039/a707652e
日期:——
Regioselectivity in the palladium-catalysed allylic alkylation of 1-arylprop-2-enyl acetates [ArCH(OAc)CHCH2] or (E)-3-phenylprop-2-enyl acetate (PhCHCHCH2OAc) with sodium enolates of soft carbon nucleophiles is controlled by addition of a catalytic amount of lithium iodide to give lienar products [(E)-ArCHCHCH2Nu] exclusively; their branch isomers [ArCH(Nu)CHCH2] were not detected.
2-(Phenylsulfonyl)-1,3-dienes as versatile synthons in organic transformations. Multicoupling reagents and Diels-Alder dienes with a dual electron demand
作者:Jan E. Baeckvall、Seppo K. Juntunen
DOI:10.1021/ja00255a027
日期:1987.10
le phenylsulfonyl-2 cyclohexadiene-1,3, le phenylsulfonyl-3 butadiene-1,3 et le phenylsulfonyl-2 pentadiene-1,3. Reaction de Diels-Alder entre plusieurs phenylsulfonyl-2 dienes-1,3 et certainsdienophiles comme l'acrylate de methyle (les enamines et les ethers d'enols donnent des reactions hautement regioselectives)
添加 de Michael de Differents 亲核试剂 sur le phenylsulfonyl-2 cyclohexadiene-1,3、le phenylsulfonyl-3 butadiene-1,3 和 le phenylsulfonyl-2 pentadiene-1,3。Reaction de Diels-Alder entre plusieurs phenylsulfonyl-2 dienes-1,3 和某些 dienophiles comme l'丙烯酸酯 demethyle (les enamines et les ethers d'enol donnent des reactors hautement regioselectives)
Synthesisi of Erythrina and Related Alkaloids. Part XLVII. General Method for Synthesis of Erythrinan and Homoerythrinan Alkaloids (1): Synthesis of a Cycloerythrinan, as a Key Intermediate to Erythrina Alkaloids, by Pummerer-Type Reaction.
A new synthetic route to Erythrina alkaloids by formation of ring C utilizing a Pummerer-type intramolecular cyclization was developed. The N-(2-phenylthioethyl)-dioxopyrroline (3) was converted to 13 in five steps with satisfactory overall yield (69%) by means of [2+2] photocycloaddition followed by 1, 3-anionic rearrangement as crucial reactions. Treatment of the sulfoxide (13) with trifluoroacetic anhydride gave the cyclization product, 11-phenylthioerythrinan (15), in 87% yield. This was converted to the cycloerythrinan (22) by reductive elimination of the PhS group, thus constituting a formal total synthesis of (±)-erysotrine.