An Oxidation Study of Phthalimide-Derived Hydroxylactams.
An Oxidation Study of Phthalimide-Derived Hydroxylactams.
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邻苯二甲酰亚胺衍生的羟基内酰胺的氧化研究。
DOI:
10.3390/molecules27020548
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发表时间:
2022-01-15
期刊:
影响因子:
--
通讯作者:
Luzzio FA
中科院分区:
文献类型:
--
作者:
Adjei BL;Luzzio FA
A systematic study of the oxidation of 3-hydroxy-2-substituted isoindolin-1-ones (hydroxylactams) and their conversion to the corresponding phthalimides was undertaken using three oxidants. Of special interest was the introduction of nickel peroxide (NiO2) as an oxidation system for hydroxylactams and comparison of its performance with the commonly used pyridinium chlorochromate (PCC) and iodoxybenzoic acid (IBX) reagents. Using a range of hydroxylactams, optimal conversions of these substrates to the corresponding imides was achieved with 50 equivalents of freshly prepared NiO2 in refluxing toluene over 5–32 h reaction times. By comparison, oxidations of the same substrates using PCC/silica gel (three equivalents) and IBX (three equivalents) required oxidation times of 1–3 h for full conversion but required lengthier purification. While nominal amounts (~25 mg) of substrate hydroxylactams were used to ascertain conversion, scale-up procedures using all three methods gave good to excellent isolated yields of imides.
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