Zobrazeno 1 - 10
of 34
pro vyhledávání: '"Eike Hupe"'
Publikováno v:
Tetrahedron. 59:9187-9198
The thermal migration of cyclic and acyclic organoboranes were studied. In most cases, a stereoselective 1,2-dyotropic migration was observed, allowing the stereocontrol of three contiguous chiral centers. Scope and limitations of this thermal migrat
Publikováno v:
Journal of Organometallic Chemistry. 680:136-142
Applications of the boron–zinc exchange reaction to make new carboncarbon bonds are reviewed. Functionalized chiral secondary alkylzinc reagents can be prepared by this exchange reaction and allows to perform formal enantioselective Michael-addi
Publikováno v:
Chemistry - A European Journal. 9:2789-2796
The scope of substrate-controlled diastereoselective hydroborations can be considerably enhanced by a boron-zinc exchange reaction, providing organozinc derivatives that react with a broad range of electrophiles. Even normally unreactive boronic este
Publikováno v:
Organometallics. 21:2203-2207
The mechanism of the boron−zinc exchange reaction has been studied by applying density functional calculations at the B3PW91 level of theory. It was found that the exchange reaction proceeds with a low activation barrier, involving two intermediate
Autor:
Paul Knochel, Eike Hupe
Publikováno v:
Angewandte Chemie. 113:3109-3112
Autor:
Eike Hupe and, Paul Knochel
Publikováno v:
Organic Letters. 3:127-130
[figure: see text] Various trisubstituted olefins were converted to configurationally stable diorganozinc compounds with high diastereoselectivity. Their reaction with various electrophiles centered on tin, sulfur, bromine, and phosphorus provided th
Publikováno v:
Angewandte Chemie. 112:2396-2399
Publikováno v:
Angewandte Chemie International Edition. 39:2294-2297
Publikováno v:
The Journal of Organic Chemistry. 64:9547-9556
Various alkyl derivatives of 1-(trimethylsilanyl)but-3-en-2-ol acetate (1a−e) undergo regioselective palladium-catalyzed nucleophilic substitution via β-silyl-substituted (η3-allyl)palladium intermediates. With external nucleophiles, such as malo
Publikováno v:
European Journal of Inorganic Chemistry. 1999:1001-1007
Starting from picolinic acids 3 and 4, the amino acid-derived 2-aminoacylpyridine N-oxides 1a,c–e and 2,6-bis(aminoacyl)pyridine N-oxides 2b–e can be prepared in two steps by the coupling of picolinic acid N-oxides 5 and 6 under Appel conditions