从β-芳酰基-硫代乙酰苯胺,芳族醛和2-基化合物轻松快速合成迄今未知的3-芳酰基-4-芳基-2-苯基氨基-4 H-苯并[ g ]色烯-5,10-二酮首次公开了通过InCl 3催化一锅三组分串联Knoevenagel缩合反应的羟基-1,4-萘醌-迈克尔加成-分子内环化-消除反应顺序。此多米诺协议已用于获得高度取代的吡喃并[3,2- c ] chromen-5(4 H)-ones和7,7-二甲基-7,8-dihydro-4 H -chromen-5(6 H)从-酮ñ,3-二芳基-3-氧代丙硫酰胺,芳族醛和4-羟基香豆素或二甲酮在温和的反应条件下。提出了合理的反应机理。具有3(2-氯苯甲酰基)的4 H-吡喃并[3,2- c ] chromen -5-one和7,7-二甲基-7,8 -dihydro-4 H -chromen-5(6 H)-one衍生物)-2-苯基氨基取代基在碱性条件下进一步环化,生成五环7
Reactivity of Functionalized <i>N</i>,<i>S</i>-Ketene Acetal: Regioselective Construction of Tetrahydrobenzo[<i>b</i>]pyran and Chromeno[2,3-<i>b</i>]quinoline Derivatives
作者:Ming Li、Yan-Li Hou、Li-Rong Wen、Fu-Meng Gong
DOI:10.1021/jo101902z
日期:2010.12.17
Regioselective synthesis of functionalized tetrahydrobenzo[b]pyrans has been developed by multi-component reactions (MCRs) and tandem [3 + 3] annulations of beta-benzoylthioacetanilides or beta-(2-haloaroyl)thioacetanilides as valuable sources with aromatic aldehydes and 5,5-dimethy1-1,3-cyclohexanedione catalyzed by triethylamine. This MCR followed by a postcondensation cyclization via an intramolecular SNAr in the presence of K2CO3 led to an unprecedented novel chromeno-[2,3-b]quinoline framework containing an important chromene moiety in good yields. The reactions were very mild, convenient, and o-selective to form new fused tetracyclic target molecules.