1,4-Diazepinone and Pyrrolodiazepinone Syntheses via Homoallylic Ketones from Cascade Addition of Vinyl Grignard Reagent to α-Aminoacyl-β-amino Esters
作者:Hassan S. Iden、William D. Lubell
DOI:10.1021/ol061036k
日期:2006.8.1
were synthesized from common homoallylic ketone precursors 4 prepared by copper-catalyzed cascade addition of a vinyl Grignard reagent to alpha-aminoacyl beta-amino esters 3. Nitrogen deprotection and intramolecular reductive amination yielded 1,4-diazepinones 5. Olefin oxidation, Boc removal, and intramolecular Paal-Knorr condensation gave pyrrolodiazepinones 8 and 9. X-ray structures of diazepinones
[反应:请参见文本]由普通的均烯丙基酮前体4合成了1,4-二氮杂酮5和吡咯并二氮杂酮8和9,后者是通过将铜格氏试剂与α-氨基酰基β-氨基酯3进行铜催化级联加成反应制得的。分子内还原胺化得到1,4-二氮杂潘酮5。烯烃氧化,Boc去除和分子内Paal-Knorr缩合得到吡咯并二氮杂吡啶酮8和9。二氮杂庚酮5c和5d的X射线结构描绘了与α-氨基酸部分相似的二面角,类似于理想反向伽马转中中心残基的残基。