Literature examples illustrating the use of oxalyl chloride to prepare dicarboxylicacid anhydrides are surprisingly limited. At the same time, we have discovered a method involving the use of this readily available reagent which allowed the preparation of novel cyclic anhydrides where other, more conventional, methods had failed. Herein, we demonstrate that the method is applicable to a wide diversity
Beyond the Five and Six: Evaluation of Seven-Membered Cyclic Anhydrides in the Castagnoli–Cushman Reaction
作者:Mykhailo I. Adamovskyi、Sergey V. Ryabukhin、Dmitriy A. Sibgatulin、Eduard Rusanov、Oleksandr O. Grygorenko
DOI:10.1021/acs.orglett.6b03426
日期:2017.1.6
method worked with imines generated from aromatic or α-branched aliphatic aldehydes and is amenable for both parallel synthesis and scale-up. The procedure for epimerization of the resulting trans-disubstituted tetrahydrobenzo[d]azepines to their cis isomers was also developed.
与苯并[ d ]氧杂环庚烷-2,4(1 H,5 H)-二酮作为酸酐组分的Castagnoli–Cushman反应可用于制备2,3-二取代的4-氧代-2,3,4,5-四氢呋喃-1 H-苯并[ d ]氮杂-1-羧酸的产率为21–75%,反式非对映选择性良好。该方法适用于由芳族或α-支化脂族醛生成的亚胺,适用于平行合成和放大。还开发了将所得的反式-二取代的四氢苯并[ d ]氮杂环庚烷异构化成其顺式异构体的方法。
o-Phenylenediacetic Acid Anhydride in the Castagnoli–Cushman Reaction: Extending the Product Space to ε-Lactams
作者:Mikhail Krasavin、Olga Bakulina、Dmitry Dar’in
DOI:10.1055/s-0036-1588714
日期:2017.6
The diversity of lactam products accessible by the Castagnoli–Cushman reaction (CCR) of imines and dicarboxylic acid anhydrides has been extended to privileged e-lactams. This novel variant of the CCR using o-phenylenediacetic anhydride is often high-yielding and remarkably diastereoselective and allows the use of α-C–H imines.
one-pot Staudinger/aza-Wittig/Castagnoli-Cushman reaction sequence for a series of azido aldehydes and homophthalic anhydrides is described. The reaction proceeded at room temperature and delivered novel polyheterocycles related to the natural product realm in high yields and high diastereoselectivity. The methodology has been extended to three other cyclic anhydrides. These further unravel the potential