The .beta.' lithiation of .alpha.,.beta.-unsaturated amides
作者:Peter Beak、Dale J. Kempf、Kenneth D. Wilson
DOI:10.1021/ja00302a024
日期:1985.8
La lithiation est realisee par le sec-butyl/Li dans la N,N,N',N'-tetramethyl ethylenediamine
La 锂化 est realisee par le sec-丁基/Li dans la N,N,N',N'-四甲基乙二胺
New methods and reagents in organic synthesis. 41. Lithium trimethylsilyldiazomethane. A new synthon for the preparation of pyrazoles from α,β-unsaturated nitriles
作者:Tayahiko Aoyama、Sumie Inoue、Tokoyuki Shioiri
DOI:10.1016/s0040-4039(00)99904-0
日期:1984.1
Lithium trimethylsilyldiazomethane reacts smoothly with various α,β-unsaturated nitriles to give 3(or 5)-trimethylsilylpyrazoles in good yields.
of aryl cyanides with diboron in the presence of a rhodium/Xantphos catalyst and DABCO affords arylboronic esters via carbon-cyano bond cleavage. This unprecedented mode of reactivity for a borylrhodium species allows the regioselective introduction of a boryl group in a late stage of synthesis.
nickel-catalyzed cyanation of phenol derivatives with metal-free cyanating agents, aminoacetonitriles, is described. A nickel-based catalytic system consisting of a unique diphosphine ligand such as dcype or dcypt enables the cyanation of versatile phenol derivatives such as aryl carbamates and aryl pivalates. The use of aminoacetonitriles as a cyanating agent leads to an environmentally and easy-to-use method
Reactions of vinylsilanes with lewis acid-activated iodosylbenzene: stereospecific syntheses of vinyliodonium tetrafluoroborates and their reactions as highly activated vinyl halides
salts behave like the highly activated species of vinyl iodides due to the high leaving ability of the iodine(III) substituents. Thus, a variety of substituted olefins including α-cyano and α-nitro olefins, vinyl sulfides, vinyl halides, and α,β-unsaturated esters, were synthesized from under mild conditions. A ligand coupling mechanism via the formation of 10-I-3 intermediate containing a copper(III)