Organolithium reagents by reductive decyanation of nitriles with lithium and a catalytic amount of 4,4′-Di-tert-butyl-biphenyl in a Barbier-Type reaction
作者:David Guijarro、Miguel Yus
DOI:10.1016/s0040-4020(01)87024-1
日期:1994.3
The reaction of different nitriles 1 with an excess of lithium powder (1:14 molar ratio) and a catalytic amount of 4,4′-di-tert-butylbiphenyl (5 mol %) in the presence of a carbonyl compound (Barbier-type conditions) in THF at low temperature (−30 or −78°C) leads to the corresponding compounds 2 resulting from the coupling between the electrophile and the organolithium intermediate arising from a reductive
Iron-catalyzed δ-selective conjugate addition of methyl and cyclopropyl Grignardreagents to α,β,γ,δ-unsaturated esters and amides took place in good yields to give products exclusively with cis-β,γ-olefinic bond.
Offenbart werden gegebenenfalls isolierte und/oder aufgereinigte Enantiomere der 2-Heptylcyclopropyl-1-carbonsäure sowie Gemische von zwei, drei oder sämtlichen Enantiomeren der 2-Heptylcyclopropyl-1 carbonsäure als Duft-und/oder Aromastoffe.
Optionally isolated and/or purified enatiomers of 2-heptylcyclopropyl-1-carboxylic acid and mixtures of two, three or all enantiomers of 2-heptylcyclopropyl-1-carboxylic acid are disclosed as perfumes and/or flavourings.