Green Progression for Synthesis of Regioselective β-Amino Alcohols and Chemoselective Alkylated Indoles
作者:Boningari Thirupathi、Rapelli Srinivas、Avvari N. Prasad、J. K. Prashanth Kumar、Benjaram M. Reddy
DOI:10.1021/op1002177
日期:2010.11.19
Solid acid catalysts based on zirconia materials were investigated for the first time as catalysts for regioselective organic synthesis under environmentally benign and mild conditions. The novel TiO2−ZrO2 mixed oxide catalyst led to two distinct products by the formation of an N−C bond (β-aminoalcohols) and a C−C bond (Friedel−Crafts alkylation).
Ketosulfonyl indoles in the regiodefined synthesis of tryptophols and related indole derivatives
作者:Alessandro Palmieri、Marino Petrini
DOI:10.1039/c2ob25056j
日期:——
Reduction of ketosulfonyl indoles with sodium borohydride provides a ready entry to tryptophols in a regiocomplementary fashion with respect to the traditional oxirane ring-opening by indoles under Friedel–Crafts conditions. Compared to traditional β-ketosulfones, ketosulfonyl indoles show a peculiar behavior since they undergo a Lewis acid promoted elimination of the arylsulfonyl group allowing the