Extending the versatility of the Hemetsberger–Knittel indole synthesis through microwave and flow chemistry
作者:Nadeesha Ranasinghe、Graham B. Jones
DOI:10.1016/j.bmcl.2013.01.066
日期:2013.3
Microwave, flow and combination methodologies have been applied to the synthesis of a number of substituted indoles. Based on the Hemetsberger-Knittel (HK) process, modifications allow formation of products rapidly and in high yield. Adapting the methodology allows formation of 2-unsubstituted indoles and derivatives, and a route to analogs of the antitumor agent PLX-4032 is demonstrated. The utility of the HK substrates is further demonstrated through bioconjugation and subsequent ring closure and via Huisgen type [3+2] cycloaddition chemistry, allowing formation of peptide adducts which can be subsequently labeled with fluorine tags. (C) 2013 Elsevier Ltd. All rights reserved.