Enaminone Substituents Attached to Cyclopentadienes:3E/3Z Stereochemistry of 1-Metalla-1,3,5-hexatriene Intermediates (M=Cr, W) as a Functional Criterion for the Formation of Cyclopentadienes and Six-Membered Heterocycles, Respectively
作者:Rudolf Aumann、Inigo Göttker-Schnetmann、Roland Fröhlich、Pauli Saarenketo、Christiane Holst
DOI:10.1002/1521-3765(20010202)7:3<711::aid-chem711>3.0.co;2-5
日期:2001.2.2
Reactions of NH-enaminones 2 with [2-(1-cycloalkenyl)ethynyl]carbene complexes 7 (M=W, Cr) gave tetrahydropentalenes, tetrahydroindenes, and hexahydroazulenes 8a-i, in which the NH-enaminone moiety is attached to the cyclopentadiene unit. The reaction involved formation of (3E)-1-metalla-1,3,5-hexatriene intermediates, which underwent pi cyclization faster than 3E/3Z isomerization. Tungsten complexes
NH-烯胺酮2与[2-(1-环烯基)乙炔基]卡宾配合物7(M = W,Cr)的反应得到四氢戊烯,四氢茚和六氢azulenes 8a-i,其中NH-烯胺酮部分连接到环戊二烯上单元。该反应涉及形成(3E)-1-金属-1,3,5-己三烯中间体,其比3E / 3Z异构化进行π环化的速度更快。钨络合物12和13被表征为反应中间体。就环戊二烯基和烯胺酮部分的配位而言,化合物8是潜在的二齿配体。