Simple, fast and efficient synthesis of β-keto esters from the esters of heteroaryl compounds, its antimicrobial study and cytotoxicity towards various cancer cell lines
摘要:
A series of beta-keto esters were synthesized from heteroaryl esters and ethyl acetate using LiHMDS as base at -50 to -30 degrees C. The increase in yields of cross condensed product were observed and the percentage of self condensed product was reduced drastically by applying the suitable base (LiHMDS), solvent and the minimum amount of ethyl acetate. All these beta-keto esters were characterized using H-1 NMR, C-13 NMR and mass spectral data. A plausible mechanism is also depicted to prove the formation of trans-esterified products. All the synthesized compounds were subjected to test for their cytotoxicity towards various cancer cell lines and also tested for their antimicrobial activity towards various bacterial and fungal strains and some of them were found to have promising activity. (C) 2012 Elsevier Ltd. All rights reserved.
Synthesis of cyclic chiral α-amino boronates by copper-catalyzed asymmetric dearomative borylation of indoles
作者:Lili Chen、Jun-Jian Shen、Qian Gao、Senmiao Xu
DOI:10.1039/c8sc01815d
日期:——
A copper(I)-catalyzed dearomative borylation of N-alkoxycarbonyl protected indole-3-carboxylates has been developed. The boron addition in this reaction occurred regioselectively at the 2-position of indoles followed by diastereoselective protonation, affording the corresponding stable cyclic chiral α-amino boronates (2-borylindolines) in moderate to good yields with excellent diastereo- and enantioselectivities
efficient dearomative hydroalkylation of indoles using alkanes or ethers as alkyl radical sources and TBADT as a cost-effective photocatalyst for direct hydrogenatomtransfer (HAT). Successful conversion of these heterocyclic derivatives into 2-alkylindolines with good to excellent yields and high diastereoselectivity is achieved under mild reaction conditions.