A versatile method for the hydrolysis of gem-dibromomethylarenes bearing carboxylate or boronate group into aldehydes
摘要:
Hydrolysis of geni-dibromomethylarenes bearing carboxylate or boronate group to corresponding aldehydes without affecting the ester group was successfully accomplished in high yields by subjecting them to refluxing pyridine. Both aromatic and heteroaromatic substrates gave the corresponding aldehydes in good yields. This method was efficiently adapted for the large scale synthesis of 2d and 2f. (C) 2007 Elsevier Ltd. All rights reserved.
gem-Dibromomethylarenes: A Convenient Substitute for Noncommercial Aldehydes in the Knoevenagel−Doebner Reaction for the Synthesis of α,β-Unsaturated Carboxylic Acids
摘要:
[Graphics]A facile synthesis of alpha,beta-unsaturated carboxylic acids from gem-dibromomethylarenes is described. gem-Dibromomethylarenes are employed for the first time in the Knoevenagel-Doebner reaction as aldehyde equivalents for the efficient synthesis of alpha,beta-unsaturated carboxylic acids.
efficient synthesis of cinnamicesters is described. This reaction provides cinnamicesters in a single step from gem-dibromomethyl aromatics, which otherwise require the hydrolytic conversion of gem-dibromides into aldehydes, and demonstrates the use of an alternative reagent for noncommercial and expensive aldehydes. Further, the reaction of gem-dibromomethyl aromatics with malonic acid and di-tert-butyl
A new variant of the Pictet-Spengler reaction has been developed using gem-dibromomethylarenes as aldehyde surrogates to afford a variety of tetrahydroisoquinoline and isoindoloisoquinolone ring systems in good yields. These systems comprise important motifs in naturally occurring bioactive substances.
<i>gem</i>-Dibromomethylarenes: A Convenient Substitute for Noncommercial Aldehydes in the Knoevenagel−Doebner Reaction for the Synthesis of α<i>,</i>β-Unsaturated Carboxylic Acids
作者:John Kallikat Augustine、Yanjerappa Arthoba Naik、Ashis Baran Mandal、Nagaraja Chowdappa、Vinuthan B. Praveen
DOI:10.1021/jo701888m
日期:2007.12.1
[Graphics]A facile synthesis of alpha,beta-unsaturated carboxylic acids from gem-dibromomethylarenes is described. gem-Dibromomethylarenes are employed for the first time in the Knoevenagel-Doebner reaction as aldehyde equivalents for the efficient synthesis of alpha,beta-unsaturated carboxylic acids.
A versatile method for the hydrolysis of gem-dibromomethylarenes bearing carboxylate or boronate group into aldehydes
作者:John Kallikat Augustine、Y. Arthoba Naik、Ashis Baran Mandal、Nagaraja Chowdappa、Vinuthan B. Praveen
DOI:10.1016/j.tet.2007.11.030
日期:2008.1
Hydrolysis of geni-dibromomethylarenes bearing carboxylate or boronate group to corresponding aldehydes without affecting the ester group was successfully accomplished in high yields by subjecting them to refluxing pyridine. Both aromatic and heteroaromatic substrates gave the corresponding aldehydes in good yields. This method was efficiently adapted for the large scale synthesis of 2d and 2f. (C) 2007 Elsevier Ltd. All rights reserved.