Bulletin of the Chemical Society of Japan p. 2452 - 2457 (1983)
Update date:2022-08-16
Topics:
Watanabe
Tsuji
Ohsugi
Shida
Aminoarenes reacted with 2-propen-1-ol and 2-buten-1-ol at 180 degree C to give quinoline derivatives in fairly good yields in the presence of a catalytic amount of a ruthenium complex. Dichlorotris(triphenylphosphine)-ruthenium was the most effective catalyst. THe aminoarenes with electron-releasing groups favored the formation of the quinolines. The N-heterocyclization also proceeded when aliphatic aldehydes were used in place of the allylic alcohols. The employment of allylic alcohols gave, however, higher yields in several cases. The reaction involves the isomerization of the allylic alcohols to the corresponding aldehydes. The aldehydes reacted with aminoarenes to give Schiff-base dimers which were then cyclized in the presence of the ruthenium complex to the quinolines. As a key intermediate in the reaction, the ortho-metallated species is proposed.
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