A Regioselective Cyclohexannulation Procedure<i>via</i>Dienamine [4 + 2] Cycloaddition. Synthesis of Functionalised Decalins
作者:Roger L. Snowden、Simon M. Linder、Manfred Wüst
DOI:10.1002/hlca.19890720505
日期:1989.8.9
A regioselective cyclohexannulation procedure, whose key step involves the [4 + 2] cycloaddition of dienamines 12–24 with methyl acrylate, allows the conversion of cycloalkanones 1–11 to bicyclic dienoates 25 – 37. The chemistry of 26 is briefly examined and, in the context of organoleptic studies concerning functionalised 5,5,9-tri-methyldecalins, the transformation of 37 to ketones 44 and 46 as well
Synthesis of the 5- and 6- methyltetralins by continuous methylation of
申请人:UOP
公开号:US05073654A1
公开(公告)日:1991-12-17
Continuous methylation of tetralin with methanol over several solid acid catalysts affords a mixture of 5-methyltetralin and 6-methyltetralin with selectivity of better than 65% at high conversions. Zeolite .beta. is a particularly effective catalyst insofar as it catalyzes the reaction at a temperature approximately 100.degree. C. lower than that required for silica-aluminas. However, the reaction temperature is quite sensitive to the concentration of methanol in the feedstock.