Synthesis of indolin-2-ones (oxindoles) related to mitomycin A
作者:Ralph A. Raphael、Paul Ravenscroft
DOI:10.1039/p19880001823
日期:——
Oxindoles (Indolin-2-ones) containing the functionality of the first two rings of the mitomycin A structure have been synthesized. Attempts to employ the oxindole grouping to construct the third ring were unsuccessful because of the resistance of the oxindole group or its derivatives towards nucleophilic attack. An unusual methylation of 3-methyl-5-nitrobenzene-1,2,4-triol to give the (E)-3,6-dihydroxy-2-methyl-1
Tin-free reductive photochemical carboxymethylation of olefins with α-alkylthioacetates
作者:Lisa X. Deng、Andrei G. Kutateladze
DOI:10.1016/s0040-4039(97)10095-8
日期:1997.11
An efficient tin-free reductive photochemical carboxymethylation of olefins with α-alkylthioacetates is developed, which (a) is an experimentally simple technique furnishing substituted derivatives of fatty acids in moderate to good yields, (b) is compatible with polar/protic functional groups and solvents, (c) does not require a special reducing reagent, (d) is fairly insensitive to the presence of
the ammonium salt from N‐methylation 2 dominated. The isomeric sulfonium salt 3 prepared by an independent route was found to be unstable and rearranged to the isomeric ammonium salt. The rearrangement pathway was investigated using deuterium‐labeled reactants. The sulfonium salt 3 also produced a piperazinium double salt 9 on heating. The reaction pathway was also followed by deuterium labeling. The