Azo anions in systhesis. pt 1. t-butylhydrazones as acyl-anion equivalents
作者:Jack E. Baldwin、Robert M. Adlington、Jeffrey C. Bottaro、Jayant N. Kolhe、Matthew W.D. Perry、Ashok U. Jain
DOI:10.1016/s0040-4020(01)87647-x
日期:1986.1
tautomerisation and hydrolysis gave α-hydroxy ketones, ketones, and γ-keto esters in good yield, thereby providing a convenient new acyl-anionequivalent. Reaction of these lithium salts with aldehydes and ketones, followed by elimination provided a new route to azo alkenes.
complexes 2, which undergo loss of the metal fragment at room temperature to form 1,2-diketones 3, 1,2-hydroxy ketones 4, or dimers 5 through a dimerization or decarbonylation-dimerization process of acyl radicals. Decomposition of 2 in the presence of electron-deficient alkenes 11 and 18 furnishes the two-, three-, and four-component coupling products 12, 13, 19, 20, and 21.