Reactions of benzyl alcohols with HI in solvent-free conditions were examined. Three types of reactions (iodination, reduction, and ring formation) occurred depending on the degree of crowding around the benzyl position and the benzylic stabilization of substrates. Results also showed that the ring formation to give indanes proceeded efficiently when HI was used, and that compounds with electron-rich
Metal-Free Domino One-Pot Decarboxylative Cyclization of Cinnamic Acid Esters: Synthesis of Functionalized Indanes
作者:Alavala Gopi Krishna Reddy、Gedu Satyanarayana
DOI:10.1021/acs.joc.6b02015
日期:2016.12.16
Their formation can be explained via acid triggered decarboxylation of cinnamic acid esters and subsequent inter/intramolecular cyclization. Overall process involves in the intramolecular cleavage of two σ-bonds (C–O and C–C) and inter/intramolecular construction of two/one C–C σ-bond(s). Significantly, this protocol was successful without the aid of any metal salts.
Acid-promoted SN1/E1 fragmentation/dimerization of 2-cumylmalonates
作者:Jonathan T. Reeves、Daniel R. Fandrick、Zhulin Tan、Jinhua J. Song、Nathan K. Yee、Chris H. Senanayake
DOI:10.1016/j.tetlet.2009.04.022
日期:2009.6
Several diethyl 2-cumylmalonates underwent fragmentation and dimerization in PPA at elevated temperatures to give 1,1,3-trimethyl-3-arylindanes in good yields. The same products were obtained from 2-cumylmalonic acid, ethyl 2-cumylcyanoacetate, and 2-cumyl Meldrum’s acid. This represents the first example of an SN1/E1 ionization with diethyl malonate as the leaving group.
几种2-枯基丙二酸二乙酯在升高的温度下在PPA中进行裂解和二聚,从而以良好的收率得到1,1,3-三甲基-3-芳基茚满。相同的产物得自2-枯基丙二酸,2-枯基氰基乙酸乙酯和2-枯基梅德鲁姆酸。这代表了以丙二酸二乙酯作为离去基团进行S N 1 / E1电离的第一个例子。