Carbonylative Suzuki–Miyaura couplings of sterically hindered aryl halides: synthesis of 2-aroylbenzoate derivatives
作者:Aya Ismael、Troels Skrydstrup、Annette Bayer
DOI:10.1039/d0ob00044b
日期:——
diversely substituted 2-aroylbenzoate esters featuring a new protocol for the carbonylative coupling of aryl bromides with boronic acids and a new strategy to favour carbonylative over non-carbonylative reactions. Two different synthetic pathways - (i) the alkoxycarbonylation of 2-bromo benzophenones and (ii) the carbonylative Suzuki-Miyaura coupling of 2-bromobenzoate esters - were evaluated. The latter approach
3‐disubstituted phthalides in good to high yields at ambienttemperature. In a similar manner, 3‐hydroxyisoindolin‐1‐one and 3‐hydroxyoxindole derivatives could also be easily prepared by direct reductive coupling of phthalimides and N‐substituted isatins with activated alkenes, respectively. Application of this methodology towards the synthesis of 1‐naphthol derivatives on a gram scale is also depicted
zed carbonylations involved either toxic carbon monoxide (CO) gas as carbonylating agent or functional-group-assisted ortho sp2 C–H activation (i.e., ortho acylation) or carbonylation by activation of the carbonyl group (i.e., via the formation of enamines). Contradicting these methods, here we describe an environmentally benign process, [Pd]-catalyzed direct carbonylation starting from simple and
Reactions of 2-acylbenzoates with dimethyloxosulphonium methylide: A novel route to isocoumarins
作者:Kevin Beautement、John M. Clough
DOI:10.1016/s0040-4039(01)81355-1
日期:1984.1
Treatment of 2-benzoylbenzoates with dimethyloxosulphoniummethylide (1) gives 4-phenylisocoumarins (2); methyl 2-acetylbenzoate gives 4-methylene-3,4-dihydroisocoumarin (3) under the same conditions.
Construction of an isoquinolinone framework from carboxylic-ester-directed umpolung ring opening of methylenecyclopropanes
作者:Hao-Zhao Wei、Yin Wei、Min Shi
DOI:10.1039/d1cc04826k
日期:——
An interesting type of reaction involving functionalized methylenecyclopropanes (MCPs) has been revealed. Here, a nucleophilic attack of an anionic species onto a partially polarity-reversed MCP was realized by treating a neighbouring carboxylic ester tethered to the MCP and amine with KHMDS to realize an umpolung ringopening of the MCP. This work established an operationally convenient protocol for