Commercially available potassium hydroxide (KOH), a simple base, was found to be a catalyst for tandem cross-aldol condensation between cyclic ketones and aromatic aldehydes leading to a fast and easy synthesis ofα,α-bis (substituted-arylidene) cycloalkanones in the shortest times of all previous methods. The reaction of aryl aldehydes with five and six-membered cyclic ketones afforded excellent yields after few seconds in most cases. The reaction conditions were compatible with various electron withdrawing and electron donating substituents,e.g.Cl, F, NO2, OMe, Me and NMe2.
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氢氧化钾(KOH),一种简单的碱,被发现是环状酮和芳香醛之间串联十字-醛缩合的催化剂,从而在所有先前方法中时间最短地合成
α,α-双(取代芳基亚亚甲基)
环戊酮。芳基醛与五元和六元环状酮的反应在大多数情况下在几秒钟后得到了优异的产率。反应条件与各种电子吸引和电子供体取代基兼容,
e.g.Cl,F,NO
2,OMe,Me和NMe
2。