Synthesis and reactivity of methyl γ-azido butyrates and ethyl σ-azido valerates and of the corresponding acid chlorides as useful reagents for the aminoalkylation
作者:N. Khoukhi、M. Vaultier、R. Carrié
DOI:10.1016/s0040-4020(01)81492-7
日期:1987.1
corresponding acid chlorides 22 and 23 are shown to be interesting reagents for the nucleophilic and electrophilic aminoalkylation. α-substituted methyl γ-azidobutyrates 13 and ethyl σ-azido valerates 14 are easily accessible by alkylation of the lithium enolates of the parent compounds 13a and 14a respectively. Their chemoselective reduction leads to 3-substituted lactams 18 and 19. The acid chlorides
已显示叠氮基酯13和14以及相应的酰氯22和23是用于亲核和亲电氨基烷基化的令人感兴趣的试剂。通过分别使母体化合物13a和14a的烯醇锂烷基化,可以容易地获得α-取代的γ-叠氮基丁酸甲基酯13和σ-叠氮基戊酸乙基酯14。它们的化学选择性还原导致3-取代的内酰胺18和19。由13和14发出的酰氯22和23与亲核试剂反应,即Meldrum酸,亚磷酸三甲酯和正丁基碘化锰的碳负离子得到ω-叠氮基,β-酮酸酯25和26,ω-叠氮基,α-酰基膦酸酯29和30以及ω-叠氮基酮38和39分别丰产。在无水乙醚中用Ph 3 P处理25和26会生成环状β-烯氨基酸酯27和28,而α-酰基膦酸酯会生成环状亚氨基膦酸酯33和34a丰产。这些环化通过分子内的氮杂-维蒂希反应发生。