Chromium(II)-mediated nickel(II)-catalysed cyclisations of (iodoaryl)-substituted alkynes and alkynals
摘要:
The Chromium(II)-mediated Nickel(II)-catalysed cyclisations of (iodoaryl)-substituted alkynes 1, 2 and 7 and (iodoaryl)-substituted alkynals 9 and 10 to give the products 5, 6, 8, 11 and 12 respectively is described.
Intramolecular radical cyclization reactions. An approach to the indole alkaloids
作者:James P. Dittami、Halasya Ramanathan
DOI:10.1016/0040-4039(88)80012-1
日期:1988.1
The intramolecular radical cyclization reaction of N-allyl substituted derivatives of o-bromoacetanilide provides a short and effective route to a variety of dihydroindole systems.
A new palladium catalysed-anion capture process is proposed, Examples are provided involving cyclisation of o-(ω-acetylenic)-aryl iodides and 2-bromo-1,6-enynes to heterocyclic- and carbocyclic-vinylpalladium species followed by hydride ion capture.