Copper-Catalyzed Enantiotopic-Group-Selective Allylation of <i>gem</i>-Diborylalkanes
作者:Minjae Kim、Bohyun Park、Minkyeong Shin、Suyeon Kim、Junghoon Kim、Mu-Hyun Baik、Seung Hwan Cho
DOI:10.1021/jacs.0c11750
日期:2021.1.20
We report a copper-catalyzed enatiotopic-group-selective allylation of gem-diborylalkanes with allyl bromides. The combination of copper(I) bromide and H8-BINOL derived phosphoramidite ligand proved to be the most effective catalytic system to provide various enantioenriched homoallylic boronate esters, containing a boron-substituted stereogenic center that is solely derived from gem-diborylalkanes
Allylic tin(IV)-tin(II) chloride-acetonitrile as a novel system for allylation of carbonyls or imines
作者:Makoto Yasuda、Yoshihiro Sugawa、Akihiro Yamamoto、Ikuya Shibata、Akio Baba
DOI:10.1016/0040-4039(96)01285-3
日期:1996.8
Effective allylation of aldehydes, ketones and imines was accomplished by allylic tributyltins 1 in the presence of SnCl2 in an acetonitrile solution. In this reaction system. Sn(IV)Sn(II) transmetallation must play a key role, generating the allylictin(II) reagents as a novel reacting species. Acetonitrile effectively promoted the transmetallation to give anti-adducts in the reaction with cinnamyltin
Iridium-Catalyzed Coupling Reaction of Primary Alcohols with 1-Aryl-1-propynes Leading to Secondary Homoallylic Alcohols
作者:Yasushi Obora、Shintaro Hatanaka、Yasutaka Ishii
DOI:10.1021/ol901366q
日期:2009.8.6
We report iridium-catalyzedcoupling of 2-alkynes such as 1-aryl-1-propynes with primaryalcoholsleading to secondary homoallylic alcohols as products. This reaction involves an iridium-catalyzed novel catalytic transformation of 2-alkynes and primaryalcohols through the formation of hydrido(π-allyl)iridium as a possible key intermediate.
Hydroboration of mono-substituted allenes: A general synthetic route to the higher crotylboranes and anti-3-alkyl/aryl-4-hydroxy-1-alkenes
作者:Gowriswari Narla、Herbert C. Brown
DOI:10.1016/s0040-4039(96)02255-1
日期:1997.1
Hydroboration of mono-substituted allenes with Chx2BH at 0 °C leads to the corresponding (E)-substituted allylboranes, known as higher crotylboranes, exclusively. These higher crotylboranes react with aldehydes, and on oxidation, provide the corresponding anti-3-alkyl/aryl-4-hydroxy-1-alkenes in high diastereomeric excess. By changing the hydroborating reagent to dIpc2BH, synthesis of the corresponding
Stereoselective synthesis of allylic boronates via palladium-catalyzed cross-coupling reaction of Knochel's (dialkoxyboryl) methylzinc reagents with 1-halo-1-alkenes
作者:Takeo Watanabe、Norio Miyaura、Akira Suzuki
DOI:10.1016/0022-328x(93)83081-6
日期:1993.2
The cross-coupling reaction of (dialkoxyboryl)methylzinc reagents IZnCH2B(OR)2 with 1-halo-1-alkenes was catalysed by triphenyl-phosphine- or triphenylarsine-based palladium complexes to provide esters of stereodefined allylboronic acids with stereoselectivity. The reaction was applied to provide a cyclic alcohol via the first intramolecularallylboration of carbonyl.