TEMPO‐catalyzed decarboxylation reactions for the synthesis of 1,2‐unsubstituted indolizines
作者:Yuxuan Zhang、Wenhui Wang、Jinwei Sun、Yun Liu
DOI:10.1002/jhet.3766
日期:2020.1
An efficient synthesis of 1,2‐unsubstituted indolizines was developed via 2,2,6,6‐tetramethylpiperidine‐1‐oxyl (TEMPO)–catalyzed decarboxylation reaction. A series of target products were successfully prepared with the tolerance of a variety of functional groups. This protocol features advantages such as easily available substrates, broad substituent scope, and eco‐friendly conditions.
A number of 3-acylated indolizines were synthesized in good to excellent yields by a newly established reaction between picolinium salts and the methylsulfate salt of A (R = Me), the adduct formed from DMF-Me2SO4 as the key reagent. The low cost, short reaction time, mild reaction condition, and easy purification of the products make this an attractive new method for the synthesis of indolizine compounds. A variety of functional groups (nitro, cyano, ester, methoxy, and halogens) were well tolerated under the reaction conditions. (c) 2007 Elsevier Ltd. All rights reserved.
Controlling chemoselectivity—application of DMF di-t-butyl acetal in the regioselective synthesis of 3-monosubstituted indolizines
作者:Zhiqiang Xia、Teresa Przewloka、Keizo Koya、Mitsunori Ono、Shoujun Chen、Lijun Sun
DOI:10.1016/j.tetlet.2006.10.052
日期:2006.12
Among a number of DMF dialkyl acetals investigated for the regioselective synthesis of 3-acylindolizines, the di-t-butyl acetal, via its iminium intermediate readily formed in situ, provides the highest chemoselectivity for the intermolecular cyclization of picolinium salts. DMF di-i-butyl acetal was applied to the syntheses of a variety of 3-acylated indolizines including alkyl, aryl, and heteroaryl substituents. (c) 2006 Elsevier Ltd. All rights reserved.
SYNTHESIS OF INDOLIZINES
申请人:Synta Pharmaceuticals Corporation
公开号:EP1537105A2
公开(公告)日:2005-06-08
Synthesis of indolizines
申请人:Synta Pharmaceuticals Corp.
公开号:US20040152897A1
公开(公告)日:2004-08-05
Disclosed are methods of preparing substituted indolizines represented by the following formula:
1
comprising reacting a substrate represented by the following formula:
2
with either the cyclization reagent of the following formula:
3
or, a reagent prepared by reacting the compound represented the formula below with an alkylating agent:
4
The variables in the above formulas are defined herein.