The reaction of isophorone dienamines with certain dienophiles
作者:H. Nozaki、T. Yamaguti、S. Ueda、K. Kondô
DOI:10.1016/0040-4020(68)88097-4
日期:1968.1
Isophorone morpholine (or piperidine) dienamine exists in roughly 1 : 1 equilibrium of linear-and cross-conjugated forms. Each reacts with dienophiles to yield two different types of Diels-Alder adducts, viz., an allylic amine and a saturated ketone. Two types of Michael adducts are also produced. The product distribution is sensitive to the variation in the combination of the reactants.
Macrophomate synthase which catalyzes unusual multiple reactions from 2-pyrone (3) to macrophomic acid (1) has been purified in a homogenous state. The macrophomate synthase is a dimeric enzyme which requires Mg2+ as a co-factor and whose molecular mass is 40 kDa. Study on substrate specificity showed that the enzyme is capable of converting various 2-pyrones to the corresponding benzoates. (C) 1999 Elsevier Science Ltd. All rights reserved.