AlCl3-Mediated Aldol Cyclocondensation of 1,6- and 1,7-Diones to Cyclopentene and Cyclohexene Derivatives
摘要:
Exactly 1/3 mol of AlCl3 is sufficient to cyclize 1 mol of 1,omega-dibenzoylbutane (or pentane) to a cyclopentenone (or hexenone) derivative in high yield at room temperature in 40 min to several hours. This condensation is driven by removing elements of water as HCl and Al(OH)(3), and the product enones are exclusively unconjugated, unlike the base-catalyzed condensations providing thermodynamically more stable conjugated enones.
Conjugate addition of allylic groups to α,β-unsaturated carbonyl compounds via (η3-allyl)Fe(CO)2NO complexes
作者:Keiji Itoh、Saburo Nakanishi、Yoshio Otsuji
DOI:10.1016/0022-328x(94)80122-3
日期:1994.6
complexes undergo conjugateaddition to α,β-unsaturatedcarbonylcompounds to give the corresponding δ,ϵ-unsaturated carbonylcompounds in good yields. The reaction of (η3-1-or 2-trimethylsiloxyallyl) Fe(CO)2NO complexes with α,β-unsaturated ketones affords 1,6- or 1,5-diketones, respectively. (η3-1-Acetonylallyl)Fe(CO)2NO complexes also react with α,β-unsaturatedcarbonylcompounds to give 1,8-dicarbonyl