Nickel-catalysed decarbonylative borylation of aroyl fluorides
作者:Zhenhua Wang、Xiu Wang、Yasushi Nishihara
DOI:10.1039/c8cc08504h
日期:——
The first Ni(cod)2/PPh3 catalyst system has been established for decarbonylative borylation of aroylfluorides with bis(pinacolato)diboron. A wide range of functional groups in the substrates were well tolerated. The ease of access of the starting aroylfluorides indicates that these results might become an alternative to the existing decarbonylation events.
Palladium/Copper-Cocatalyzed Arylsilylation of Internal Alkynes with Acyl Fluorides and Silylboranes: Synthesis of Tetrasubstituted Alkenylsilanes by Three-Component Coupling Reaction
作者:Qiang Chen、Zhenyao Li、Yasushi Nishihara
DOI:10.1021/acs.orglett.1c04060
日期:2022.1.14
In this Letter, the palladium/copper-cocatalyzed arylsilylation of internal alkynes with acyl fluorides and silylboranes is described. This is the first example in which acyl fluorides have been utilized for the three-component coupling reaction via decarbonylation, yielding a variety of tetrasubstituted alkenylsilanes in moderate to good yields.
Structures of two bacteriohopanoids with acyclic pentol side-chains from the cyanobacterium Nostoc PCC 6720
作者:Ning Zhao、Nina Berova、Koji Nakanishi、Michel Rohmer、Pascale Mougenot、Uwe J. Jürgens
DOI:10.1016/0040-4020(96)00013-0
日期:1996.2
Two bacteriohopanepentols 2 and 3 have been isolated from the cyanobacteriumNostocPCC6720. Their structures were elucidated by 1H, 13C-NMR and mass spectrometry. The absolute configurations of the acyclic 1,2- and 1,2-/1,3-mixed pentolside-chains were determined by bichromophoric exciton coupled dichroism on microgram scale. An improved first step anthroylation in the two-step derivatization is
A phosphine-catalyzed acyl-group exchangereaction between carboxylic acids and an aroyl fluoride has been developed. A variety of acyl fluorides are directly obtained from carboxylic acids through a catalytic system composed of tricyclohexylphosphine (PCy3) and 2,6-difluorobenzoyl fluoride as a novel deoxyfluorination reagent.
Acyl fluorides are subjected to methoxylation with tris(2,4,6-trimethoxyphenyl)phosphine (TMPP) to afford the corresponding methyl esters in good to excellent yields. This transformation is featured by C(sp(2))-OMe bond cleavage under metal-free conditions. Unprecedented utilization of TMPP as a methoxylating agent realized the installation of an OMe group into the desired products.