Phosphine-catalyzed domino reaction: a novel sequential [2+3] and [3+2] annulation reaction of γ-substituent allenoates to construct bicyclic[3, 3, 0]octene derivatives
作者:Erqing Li、You Huang
DOI:10.1039/c3cc47716a
日期:——
We have successfully developed a novel and efficient phosphine-catalyzed sequential [2+3] and [3+2] annulation reaction of gamma-substituent allenoates to construct bicyclic[3, 3, 0]octene derivatives. The protocol uses readily available gamma-substituent allenoates as the starting materials, inexpensive PBu3 as the catalyst, and the corresponding products were obtained in good to excellent yields
Synthesis of 1,4-Enamino Ketones by [3,3]-Rearrangements of Dialkenylhydroxylamines
作者:Wiktoria H. Pecak、Jongwoo Son、Amy J. Burnstine、Laura L. Anderson
DOI:10.1021/ol501230e
日期:2014.7.3
4-enamino ketones has been achieved through the [3,3]-rearrangement of dialkenylhydroxylamines generated from the addition of N-alkenylnitrones to electron-deficient allenes. The mild conditions required for this reaction, and the simultaneous installation of a fluorenyl imine N-protecting group as a consequence of the rearrangement, avoid spontaneous cyclization of the 1,4-enamino ketones to form the
Multicomponent Reaction of Imidazo[1,5-<i>a</i>]pyridine Carbenes with Aldehydes and Dimethyl Acetylenedicarboxylate or Allenoates: A Straightforward Approach to Fully Substituted Furans
facile three-component reactions of N,N-substituted imidazo[1,5-a]pyridine carbenes, namely imidazo[1,5-a]pyridin-3-ylidenes, with aldehydes and DMAD or allenoates were disclosed. Both reactions proceeded via tandem nucleophilic addition, [3 + 2]-cycloaddition, and ring transformation to produce different 4-[(2-pyridyl)methyl]aminofuran derivatives generally in moderate yields. This work not only provided
公开了N,N-取代的咪唑并[1,5- a ]吡啶碳烯的简单的三组分反应,即咪唑并[1,5 - a ]吡啶-3-亚胺与醛和DMAD或脲基甲酸酯的反应。这两个反应都是通过串联亲核加成,[3 + 2]-环加成和环转化进行的,通常以中等收率产生不同的4-[((2-吡啶基)甲基]氨基呋喃衍生物。这项工作不仅提供了咪唑并[1,5 - a ]吡啶-3-吡咯烷在有机合成中的应用的第一个例子,而且还开发了一种直接取代完全呋喃的简单方法,而其他方法不易获得。
A Phosphine-Catalyzed Novel Asymmetric [3+2] Cycloaddition of C,N-Cyclic Azomethine Imines with δ-Substituted Allenoates
作者:De Wang、Yu Lei、Yin Wei、Min Shi
DOI:10.1002/chem.201405191
日期:2014.11.17
asymmetric [3+2] cycloadditions of C,N‐cyclic azomethine imines with δ‐substituted allenoates have been developed in the presence of (S)‐Me‐f‐KetalPhos, affording functionalized tetrahydroquinoline frameworks in good yields with high diastereo‐ and good enantioselectivities under mild condition. The substrate scope has been also examined. This is the first time that δ‐substituted allenoates have been
Generation and Rearrangement of
<i>N</i>
,
<i>O</i>
‐Dialkenylhydroxylamines for the Synthesis of 2‐Aminotetrahydrofurans
作者:Jongwoo Son、Tyler W. Reidl、Ki Hwan Kim、Donald J. Wink、Laura L. Anderson
DOI:10.1002/anie.201800908
日期:2018.5.28
provide modular access to these novel rearrangement precursors. The scope of this de novo synthesis of simple nucleoside analogues has been explored to reveal trends in diastereoselectivity and reactivity. In addition, a base‐promoted ring‐opening and Mannich reaction has been discovered to covert 2‐aminotetrahydrofurans to cyclopentyl β‐aminoacid derivatives or cyclopentenones.