Reduction of Indolin-2-ones and Desulfurization of Indoline-2-thiones to Indoline and Indole Derivatives
作者:Takehiko Nishio、Norikazu Okuda、Choji Kashima
DOI:10.1002/hlca.19900730616
日期:1990.9.19
Reduction of indolin-2-ones with lithium aluminium hydride (LAH) or diisobutylaluminum hydride (DIBAL) and desulfurization of indoline-2-thiones with Raney-Ni were investigated. Treatment of indoline-2-ones 1 with LAH or DIBAL yield indoles 4 and/or indolines 3 in moderate-to high yield depending on the substituents at N and C(3) of 1. Indoline-2-thiones 2 were desulfurized with Raney-Ni to give indoles
This study introduces a novel photochemical fluoroalkylation method for heterocycles via Electron Donor-Acceptor (EDA) complexes, bypassing the need for transition metal catalysts, photocatalysts, or external oxidants. Utilizing 395 nm LEDs, this method efficiently synthesizes fluoroalkylated quinoxalinones and indolones. The study highlights the pivotal role of EDA photoactivation, thoroughly documented
Reaction of N-butyl-N-(2-bromo-2-methylpropionyl)-arylsulfonamides with CuBr/tripyridylamine leads to amidyl radicals via 1,4-aryl migration with concomitant loss of SO2, which can further undergo cyclisation to oxindoles or reduction to amides with the ratio dependent upon the temperature and solvent utilised.
NISHIO, TAKEHIKO;OKUDA, NORIKAZU;KASHIMA, CHOJI, HELV. CHIM. ACTA, 73,(1990) N, C. 1719-1723