钯催化的溴苯或溴杂芳烃(如吡啶,噻吩,吲哚)与(Z)-1-乙氧基-2-三丁基锡烷基苯的钯催化交叉偶联反应可得到相应的(Z)-1-乙氧基-2-(芳基和杂芳基)乙烯。该方法可有效地将乙氧基乙烯基引入芳族和杂芳族环中,并被证明具有广泛的用途,可用于由2-溴苯酚,2-溴苯胺和2-溴苯甲酸酯衍生物构建苯并[ b ]呋喃,吲哚,异香豆素环。 。
Palladium-catalyzed cross-coupling reaction of iodobenzene and its 4-substituted derivatives, except for 4-nitroiodobenzene, with (Z)-1-ethoxy-2-(tributylstannyl)ethene under a carbon monoxide atmosphere (5 atm) gave the corresponding (E)-3-ethoxy-1-arylprop-2-en-1-ones in considerable yields. Syntheses of chromone and 4(1H)-quinolinone were accomplished by application of this method to 2-(methoxymethoxy)iodobenzene and ethyl 2-iodophenylcarbanylate, respectively. The results obtained on the carbonylative coupling reaction of halopyridines are also described.
Oxime-derived, chloro-bridged palladacycles 16 are efficient complexes for the Heck vinylation of aryl halides. The isolated catalysts are thermally stable, not sensitive to air or moisture and easily accessible from inexpensive starting materials. The reaction can be performed under aerobic conditions, with aryl iodides, bromides and chlorides with acrylic esters and olefins displaying turnover numbers (TON) of up to 10(10) for phenyl iodide and turnover frequencies (TOF) of 1.4 x 10(8) h(-1). Deactivated aryl bromides undergo the Heck reaction with styrene with TON and TOF values up to 97,000 and 6063 h-1, respectively. Even aryl chlorides undergo the coupling reaction with olefins with TON up to 920. Complexes 16 catalyze the synthesis of 2,3-disubstituted indenones and indoles in good yields via annulation reaction of internal alkynes with o-bromo- or o-chlorobenzaldehyde and o-iodoaniline, respectively.
Condensed heteroaromatic ring systems. XVIII. Palladium-catalyzed cross-coupling reaction of aryl bromides with (Z)-1-ethoxy-2-tributylstannylethene and its utilization for construction of condensed heteroaromatics
The palladium-catalyzedcross-coupling reaction of bromobenzenes or bromoheteroarenes such as pyridine, thiophene, indole with (Z)-1-ethoxy-2-tributylstannylethene gives good yields of the corresponding (Z)-1-ethoxy-2-(aryl and heteroaryl)ethenes. This method is effective for introducing an ethoxyethenyl group into an aromatic and heteroaromatic ring and is proved to have versatile utility for the
钯催化的溴苯或溴杂芳烃(如吡啶,噻吩,吲哚)与(Z)-1-乙氧基-2-三丁基锡烷基苯的钯催化交叉偶联反应可得到相应的(Z)-1-乙氧基-2-(芳基和杂芳基)乙烯。该方法可有效地将乙氧基乙烯基引入芳族和杂芳族环中,并被证明具有广泛的用途,可用于由2-溴苯酚,2-溴苯胺和2-溴苯甲酸酯衍生物构建苯并[ b ]呋喃,吲哚,异香豆素环。 。