已经证明了一种新颖的串联方法,用于从查耳酮和2-氨基吡啶直接合成生物活性的3-芳基咪唑并[1,2- a ]吡啶。报道的串联反应是原子经济的,预计将通过1,4-Michael加成反应,然后进行铜催化的氧化C-N键进行。发现铜的催化量对于串联反应的成功至关重要,它改变了反应途径,提供了全新的产品。该方案被证明是方便的,因为在存在空气作为氧化剂的情况下反应平稳进行而无需任何配体。
Lewis acid catalyst system for Claisen-Schmidt reaction under solvent free condition
作者:Chandni G. Halpani、Satyendra Mishra
DOI:10.1016/j.tetlet.2020.152175
日期:2020.7
function as an efficient catalystsystem for one-pot Claisen-Schmidt condensation under neat conditions. Substituted acetophenones and benzaldehydes were coupled in situ to afford their corresponding chalcones in excellent yields. The method, with a broad range of substrate tolerance and mild operational conditions can produce assorted chalcone derivatives in moderate to high yields from easily accessible
one-step synthetic protocol toward multifunctionalized m-terphenyls 5 and sulfonyl m-terphenyls 6 is developed from substituted chalcones 1 and allyl sulfone 2 in good yields via a [3C+3C] annulation. The NaH-mediated annulation features transition metal catalyst-free condition. Chalcones 1 with the functional groups tolerance are easily prepared via Claisen–Schmidt condensation of substituted benzaldehydes
Many biologically active nicotinonitriles have been reported to date. Consequently, the development of synthetic methods for multiply arylated/alkylated nicotinonitriles remains a sought-after field of research. In the present work, a new synthetic strategy for multi-substituted nicotinonitriles is described. A FeCl3-promoted condensation–cyclization reaction of an enamino nitrile and α,β-unsaturated
An efficient and facile protocol has been developed for the synthesis of pyrazolo[1,5-a]pyrimidines through the tandem reaction of 3-aminopyrazoles and chalcones in the presence of catalytic amounts of KOH. The reported method offers access to 5,7-diarylpyrazolo[1,5-a]pyrimidines in good to excellent yields. A gram-scale reaction has been performed to demonstrate the potency of optimized procedure for
在催化量的KOH存在下,通过3-氨基吡唑和查耳酮的串联反应合成吡唑并[1,5- a ]嘧啶的有效而简便的方法已被开发出来。报道的方法提供了以良好或优异的产率获得5,7-二芳基吡唑并[1,5- a ]嘧啶的方法。已经进行了克规模的反应,以证明用于放大工艺的优化程序的效力。
One‐Pot Construction of Sulfonyl Benzonorcaradienes
作者:Meng‐Yang Chang、Chun‐Yi Lin
DOI:10.1002/adsc.202300012
日期:2023.3.21
We report here on a one-pot stereoselective synthesis of strained sulfonyl benzonorcaradienes, which proceeds through base-mediated tandem annulation of o-bis-sulfonylmethyl arenes with diversified chalcones (α,β-unsaturated carbonyls) via intermolecular desulfonylative cyclopropanation, followed by intramolecular condensation. A plausible mechanism is proposed and discussed. The proposed synthetic