Type 2 Intramolecular <i>N</i>-Acylnitroso Diels−Alder Reaction: Scope and Application to the Synthesis of Medium Ring Lactams
作者:Steven M. Sparks、Chun P. Chow、Liang Zhu、Kenneth J. Shea
DOI:10.1021/jo049897z
日期:2004.4.1
Heteroatom variants of the type 2 intramolecularDiels−Alderreaction provide an efficient method for the preparation of bridged bicyclic heterocycles. The type 2 variant of the intramolecular N-acylnitroso Diels−Alderreaction is an effective method for the synthesis of bridged bicyclic oxazinolactams. Structural studies of the cycloadducts have allowed for quantification of the deformations of the
Type 2 Intramolecular Nitroso Diels−Alder Reaction. Synthesis and Structure of Bridgehead Oxazinolactams
作者:Steven M. Sparks、Jesse D. Vargas、Kenneth J. Shea
DOI:10.1021/ol005811m
日期:2000.5.1
[reaction--see text] The type 2intramolecular Diels-Alder cycloaddition utilizing N-acylnitroso dienophiles provides an efficient entry into bridged oxazinolactams. In contrast to the bimolecular counterpart, the reaction is completely regioselective. Structural characterization of the cycloadducts allows for evaluation of the olefin distortion and the degree of pyramidalization of the bridgehead
The type 2 intramolecular imino Diels-Alder reaction. Synthesis and structural characterization of bicyclo[n.3.1] bridgehead olefin/bridgehead lactams
作者:Timothy G. Lease、K. J. Shea
DOI:10.1021/ja00059a022
日期:1993.3
for the synthesis of a homologous series of bridgehead olefin-bridgehead lactams. The X-ray crystal structures of three members of this series, including the highly strained 2-carbomethoxy-8-oxo-2-azabicyclo[3.3.1]non-4-ene, were obtained. An analysis of the structural data permits evaluation of the response of the bridgehead double bond and bridgeheadamide linkages to similar torsional distorsions
2 型亚氨基 Diels-Alder 环加成反应用于合成同系列的桥头烯烃-桥头内酰胺。获得了该系列的三个成员的 X 射线晶体结构,包括高度应变的 2-carbomethoxy-8-oxo-2-azabicyclo[3.3.1]non-4-ene。对结构数据的分析允许评估桥头双键和桥头酰胺键对类似扭转变形的响应