A process for etherifying the hydroxymethyl group in position 3 of a cephalosporin by reaction of a 3-hydroxymethyl cephalosporin with an dioxycarbenium-tetrafluoroborate.
First Electrophilic Substitutions of 3-Substituted Indoles with Diethoxycarbenium Tetrafluoroborate: Functionalized Indole Derivatives
作者:Ulf Pindur、Camran Flo
DOI:10.1002/ardp.19903230205
日期:——
The indoles 2a‐2c react with diethoxycarbeniumtetrafluoroborate (1) to furnish the indolecarbaldehydes 3a‐3d. In the thermodynamically controlled reaction of 3‐methylindole (2a) with 1 the tris(indolyl)methane 4 and diskatole (5), are formed in addition. The limitations of these reactions are discussed and evidence is presented for a C‐3‐ipso‐attack and a Wagner‐Meerwein rearrangement, respectively