Water Control over the Chemoselectivity of a Ti/Ni Multimetallic System: Heck- or Reductive-Type Cyclization Reactions of Alkyl Iodides
作者:Alba Millán、Luis Álvarez de Cienfuegos、Delia Miguel、Araceli G. Campaña、Juan M. Cuerva
DOI:10.1021/ol3028913
日期:2012.12.7
A versatile Ti/Ni multimetallic protocol is described for the efficient catalysis of two different reactions, namely a Heck- and reductive-type cyclization of alkyl iodides, in the absence or presence of water, respectively. Noteworthy, the versatility of Ti(III) chemistry allows an oxidative ending step under reductive conditions to give Heck-type products, and the good H-atom transfer capabilities of Ti(III)-aqua complexes ensure reductive-type cyclizations.
A Novel and Efficient Methodology for the C−C Bond Forming Radical Cyclization of Hydrophobic Substrates in Water
作者:Yasuyuki Kita、Hisanori Nambu、Namakkal G. Ramesh、Gopinathan Anilkumar、Masato Matsugi
DOI:10.1021/ol010014p
日期:2001.4.1
The combination of water-soluble radical initiator 2,2' azobis[2-(2-imidazolin-2-yl)propane] (VA-061), water soluble chain carrier 1-ethylpiperidine hypophosphite (EPHP), and surfactant cetyltrimethylammonium bromide (CTAB) was found to be the most suitable condition for effective radical cyclization in water for a variety of hydrophobic substrates.