Silica Gel-Mediated Hydroamination/Semipinacol Rearrangement of 2-Alkylaminophenylprop-1-yn-3-ols: Synthesis of 2-Oxindoles from Alkynes and 1-(2-Aminophenyl) Ketones
作者:Dewi Susanti、Linda Li Ru Ng、Philip Wai Hong Chan
DOI:10.1002/adsc.201300911
日期:2014.2.10
Abstract2‐Alkylaminophenylprop‐1‐yn‐3‐ols, prepared from the lithium diisopropylamide (LDA)‐mediated 1,2‐addition of alkynes to 1‐(2‐aminophenyl) ketones, can be converted to 3,3‐disubstituted 2‐oxindoles by using silica gel in n‐hexane/ethyl acetate (20:1 v/v) as the reaction medium. The utility of the approach as a potential scale‐up strategy for the synthesis of 2‐oxindoles was exemplified by the large‐scale synthesis of one adduct in excellent yield. The synthetic applicability of this chemistry was also demonstrated by the recycling of the silica gel up to 8 times with no apparent loss of activity being observed for the same example.magnified image
US4096144A
申请人:——
公开号:US4096144A
公开(公告)日:1978-06-20
Synthesis of 2-aminobenzophenones through acylation of anilines with α-oxocarboxylic acids assisted by <i>tert</i>-butyl nitrite
作者:Qianqian Wang、Xinying Zhang、Xuesen Fan
DOI:10.1039/c8ob01846d
日期:——
regioselective, efficient and convenient synthesis of 2-aminobenzophenones through acylation of anilines with α-oxocarboxylic acids assisted by tert-butyl nitrite is presented. Interestingly, tert-butyl nitrite acts as not only an efficient and mild nitrosation reagent, but also a sustainable oxidant required in the Pd(II)-catalyzed decarboxylative acylation. Meanwhile, the NO unit turned out to be
A variety of 3-alkyl-, aryl- and heteroaryl-indoles have been efficiently prepared by base-induced intramolecular cyclization of suitable aromatic o-acyl substituted Horner–Wittig reagents.