Cobalt-Catalyzed Asymmetric Markovnikov Hydroboration of Styrenes
作者:Xu Chen、Zhaoyang Cheng、Zhan Lu
DOI:10.1021/acscatal.8b05135
日期:2019.5.3
A cobalt-catalyzed asymmetric hydroboration of styrenes using an imidazoline phenyl picoliamide (ImPPA) ligand was first reported to deliver the valuable chiral secondary organoboronates with good functional tolerance and highenantioselectivity (up to >99% ee). This protocol is operationally simple without any activator. Particularly, this method can be applied in the asymmetric hydroboration of allylamine
A Stereoconvergent Cyclopropanation Reaction of Styrenes
作者:Ana M. del Hoyo、Ana G. Herraiz、Marcos G. Suero
DOI:10.1002/anie.201610924
日期:2017.2
The first stereoconvergent cyclopropanation reaction by means of photoredox catalysis using diiodomethane as the methylene source is described. This transformation exhibits broad functional group tolerance and it is characterized by an excellent stereocontrol en route to trans‐cyclopropanes regardless of whether E‐ or Z‐styrene substrates were utilized.
Alkylsulfanyl-benzenes of the formula (I) wherein the bond between C
1
and C
2
is a single bond; or the bond between C
1
and C
2
together with the dotted line is a double bond, and R
1
to R
5
live the meaning as described in the specification. The compounds are useful in flavours and fragrances.
[EN] ALKYLSULFANYL-BENZENES AS FRAGRANCE COMPOUNDS<br/>[FR] ALKYLSULFANYL-BENZENES UTILISES EN TANT QUE COMPOSES DE PARFUM
申请人:GIVAUDAN SA
公开号:WO2004056765A1
公开(公告)日:2004-07-08
Alkylsulfanyl-benzenes of the formula (I) wherein the bond between C1 and C2 is a single bond; or the bond between C1 and C2 together with the dotted line is a double bond, and R1 to R5 have the meaning as described in the specification. The compounds are useful in flavours and fragrances.
Ligand-enabled stereodivergence in nickel-catalyzed regioselective hydroboration of internal allenes
作者:Xiaoxu Yang、Chunchen Yuan、Shaozhong Ge
DOI:10.1016/j.chempr.2022.10.003
日期:2023.1
extremely rare. Herein, we demonstrate that such stereodivergence can be achieved for nickel-catalyzed hydroboration of internal allenes, which enables convenient synthesis of both stereoisomers of trisubstituted alkenylboronates from the same starting reagents. Mechanistic studies reveal that these nickel-catalyzedallene hydroboration reactions do not follow conventional hydrometallation or borylmetallation