Directed ortho metalation of n,n-diethyl benzamides. Methodology and regiospecific synthesis of useful contiguously tri- and tetra-substituted oxygenated aromatics, phthalides and phthalic anhydrides
作者:S.O. de Silva、J.N. Reed、R.J. Billedeau、X. Wang、D.J. Norris、V. Snieckus
DOI:10.1016/s0040-4020(01)81579-9
日期:1992.6
contiguously 1,2,3- and 1,2,3,4-substituted benzamides (Tables 2) are given. The efficient conversion of these benzamides (6, 10, 12, 13, 18, 19) into phthalides (9a–b, 16b–c, 17) and phthalic anhydrides (8, 16a), compounds previously available by demanding, classical methods, is detailed. A short synthesis of iso-ochracinic acid (27) is described.
针对各种直接邻位取代的N,N-二乙基苯甲酰胺(表1)和连续的1,2,3-和1,2,3,4-取代苯甲酰胺(表2)的定向邻位金属化的完整实验细节给出。这些苯甲酰胺(有效转化6,10,12,13,18,19)成苯酞(9A-B,图16B-C,17)和邻苯二甲酸酐(8,16A),化合物先前可用通过要求,经典方法,详细。描述了异och酸的简短合成(27)。