Rhodium(III)-Catalyzed Regioselective Direct C4-Alkylation and C2-Annulation of Indoles: Straightforward Access to Indolopyridone
作者:Aniruddha Biswas、Rajarshi Samanta
DOI:10.1002/ejoc.201701755
日期:2018.3.29
C4‐alkylation and C2‐annulation of indole derivative has been developed by using variable diazo esters. Fine tuning of the reactivity of diazo esters leads to control in regioselectivity with wide scope and functional‐group tolerance. A straightforward approach has been established to furnish an indolopyridone scaffold.
A radical addition and cyclization relay promoted by Mn(OAc)3⋅2H2O: Synthesis of 1,2-oxaphospholoindoles and mechanistic study
作者:Meng-Meng Xu、Lu-Yao Kou、Xiao-Guang Bao、Xiao-Ping Xu、Shun-Jun Ji
DOI:10.1016/j.cclet.2021.02.001
日期:2021.6
Novel and efficient Mn(OAc)3⋅2H2O promoted radical addition-[4 + 1] cyclization relay of 3-indolymethanols and phosphites was disclosed, which afforded 1,2-oxaphospholoindole derivatives in moderate to good yields. Based on the experimental and computational studies, a mechanism involving radical addition and intramolecular cyclization cascade was proposed.
A Simple, Effective, Green Method for the Regioselective 3-Acylation of Unprotected Indoles
作者:Phuong Tran、Hai Tran、Poul Hansen、Mai Do、Thach Le
DOI:10.3390/molecules201019605
日期:——
A fast and green method is developed for regioselective acylation of indoles in the 3-position without the need for protection of the NH position. The method is based on Friedel-Crafts acylation using acid anhydrides. The method has been optimized, and Y(OTf)3 in catalytic amounts is found to be the best catalyst together with the commercially available ionic liquid [BMI]BF4 (1-butyl-3-methylimidazolium tetrafluoro-borate) as solvent. The reaction is completed in a very short time using monomode microwave irradiation. The catalyst can be reused up to four times without significant loss of activity. A range of substituted indoles are investigated as substrates, and thirteen new compounds have been synthesized.
Brønsted acidic ionic liquid-promoted direct C3-acylation of <i>N</i>-unsubstituted indoles with acid anhydrides under microwave irradiation
作者:Phuong Hoang Tran、Anh-Thanh Duy Nguyen、Hai Truong Nguyen、Thach Ngoc Le
DOI:10.1039/c7ra11362e
日期:——
A green and efficient method for the synthesis of 3-acylindoles using a Brønsted acidic ionic liquid under microwave irradiation has been developed.
使用布朗斯特酸性离子液体在微波辐射下合成3-酰基吲哚的一种绿色高效方法已经开发出来。
Acid-catalyzed acylation reaction via C–C bond cleavage: a facile and mechanistically defined approach to synthesize 3-acylindoles
作者:Qi Xing、Pan Li、Hui Lv、Rui Lang、Chungu Xia、Fuwei Li
DOI:10.1039/c4cc05047a
日期:——
A facile acid-catalyzed acylation of indoles with 1,3-dione as an eco-friendly acylating agent was developed. This protocol combines C-C bond cleavage and heterocyclic C-H bond functionalization to form new C-C bonds. Based on the detailed mechanistic studies, a credible mechanistic pathway was proposed.