Adducts of Triallylborane with Ammonia and Aliphatic Amines as Stoichiometric Allylating Agents for Aminoallylation Reaction of Carbonyl Compounds
作者:Nikolai Yu. Kuznetsov、Rabdan M. Tikhov、Tatiana V. Strelkova、Yuri N. Bubnov
DOI:10.1021/acs.orglett.8b01317
日期:2018.6.15
Triallylborane–amines adducts are effective stoichiometric allylating agents in the aminoallylation reaction of carbonyl compounds in methanol. Moreover, copper-catalyzed diastereoselective allylation of Ellman’s imine was achieved with triallylborane–methylamine adduct.
Synthesis of Bridged Azabicycles from Pyridines and Pyrrole by a Diallylboration - Ring Closing Metathesis Sequence
作者:Nikolai Yu. Kuznetsov、Viktor N. Khrustalev、Ivan A. Godovikov、Yuri N. Bubnov
DOI:10.1002/ejoc.200500560
日期:2006.1
A straightforward method for the preparation of bridged azabicycles by a diallylboration–ring closing metathesis (RCM) sequence was elaborated. The precursors for the metathesis reaction were prepared by reductive trans-diallylation of aromatic heterocycles such as pyridines, isoquinoline and pyrrole with triallylborane and an alcohol. Heating of the trans isomers with one equivalent of triallylborane
作者:Yu. N. Bubnov、F. V. Pastukhov、Z. A. Starikova、A. V. Ignatenko
DOI:10.1023/a:1015065721466
日期:——
Allylmetallation of isoquinolines, quinoline, and quinoxaline with allylic derivatives of zinc was examined for the first time. A convenient procedure was discovered and developed for the synthesis of 1,4-ethano-2,3-dihydroisoquinolines based on the reactions of isoquinolines with allylic derivatives of zinc. This multistage process involves double allylmetallation of the heterocyclic ring followed by cyclization through intramolecular carbometallation of the C=C bond. The structures of three key derivatives of 1,4-ethano-2,3-dihydroisoquinoline were established by X-ray diffraction analysis. The reactions of quinoxaline with allyl- and methallylzinc bromide proceeded stereospecifically to form trans-2,3-diallylated 1,2,3,4-tetrahydroquinoxalines. Heating of quinoline with methallylzinc bromide in THF afforded 4-methallylquinoline in nearly quantitative yield. The initially formed 1,4-metallation product underwent aromatization through elimination of HZnBr.
Reductive 1-mono- and 1,3-diallylation of isoquinoline with allylboranes
作者:Yu. N. Bubnov、S. V. Evchenko、A. V. Ignatenko
DOI:10.1007/bf00702027
日期:1993.7
Allylzinc bromide: reductivetrans-1,3-diallylation of isoquinoline and intramolecular cyclization of 2,4-dizinc derivative