Remarkable rate acceleration of water-promoted nucleophilic substitution of Baylis–Hillman acetate: a facile and highly efficient synthesis of N-substituted imidazole
作者:Jian Li、Xiaoxia Wang、Yongmin Zhang
DOI:10.1016/j.tetlet.2005.05.107
日期:2005.8
Without additional reagents, the Baylis–Hillmanacetates 2 underwent nucleophilic substitution reaction with imidazole readily in aqueous THF solution to afford the corresponding N-substituted imidazole derivatives 3 in good to excellent yields. Moreover, the reaction between the in situ generated DABCO salt of Baylis–Hillmanacetates 4 and imidazole occurs in aqueous THF providing the SN2 type products
在没有其他试剂的情况下,Baylis-Hillman乙酸酯2容易与咪唑在THF水溶液中进行亲核取代反应,从而以良好或优异的收率得到相应的N-取代的咪唑衍生物3。此外,原位生成的Baylis–Hillman乙酸盐4的DABCO盐与咪唑之间的反应发生在提供S N 2型产物5的THF水溶液中。与常规方法相比,更简单的操作程序,更好的立体选择性和更高的效率使本方案可用于制备咪唑衍生物。
Stereoselective and regioselective synthesis of $N$-substituted methyl 2-((azolyl)methyl)-3-arylacrylates from Baylis--Hillman acetates
作者:Ayşen KÖSECELİ ÖZENÇ、İlhami ÇELİK、Şule KÖKTEN
DOI:10.3906/kim-1607-35
日期:——
$N$-Substituted methyl 2-((azolyl)methyl)-3-arylacrylates were synthesized stereo- and regioselectively with one-pot reaction between Baylis--Hillman acetates and a suitable acylazole in the presence of K$_2}$CO$_3}$ as a base catalyst. The targeted $N$-substituted azole acrylates were efficiently obtained in good yields (39%-89%).
Novel One Pot Regioselective Multicomponent Synthesis of Highly Functionlaized Spiro Pyrrolidines Through 1,3-Dipolar Cycloaddition Approach
作者:Subban Kathiravan、Raghavachary Raghunathan
DOI:10.1080/00397911.2011.621098
日期:2013.3.1
One-pot multicomponent synthesis of novel highly functionalized spiro pyrrolidine oxindoles has been accomplished in good yields through1,3-dipolarcycloadditionreaction of azomethine ylide derived from sarcosine and oxindole with various benzimdazole substituted Baylis–Hillman derivatives. The regiochemical and stereochemical outcome of the multicomponent cycloadditionreaction is ascertained by spectroscopic
摘要 通过衍生自肌氨酸和羟吲哚的偶氮甲碱叶立德与各种苯并咪唑取代的 Baylis-Hillman 衍生物的 1,3-偶极环加成反应,以良好的收率完成了一锅多组分合成新型高度官能化的螺吡咯烷羟吲哚。多组分环加成反应的区域化学和立体化学结果通过光谱研究确定,其中一种产物通过 X 射线晶体学分析进行表征。图形概要