ACAT inhibitors derived from hetero-Diels-Alder cycloadducts of thioaldehydes
摘要:
Acyl-CoA:cholesterol acyltransferase (ACAT) is the enzyme largely responsible for intracellular cholesterol esterification. A systemic inhibitor of ACAT is believed to be able to slow or even reverse the atherosclerotic process. Towards that goal, a series of cyclic sulfides, derived from the hetero-Diels-Alder reaction of thioaldehydes with 1,3-dienes, and bearing carboxamide substituents, were prepared and evaluated for in vitro (in several tissues and species) and ex vivo ACAT inhibition. Minor changes in subsequent structure were found to have a significant effect in optimization of the biological activity of this series of compounds. Copyright (C) 1996 The DuPont Merck Pharmaceutical Company.
Total Synthesis of (+)-Papuamine: An Antifungal Pentacyclic Alkaloid from a Marine Sponge, <i>Haliclona </i>sp.
作者:Anthony G. M. Barrett、Mark L. Boys、Terri L. Boehm
DOI:10.1021/jo951413z
日期:1996.1.1
The total synthesis of (+)-papuamine, the antipode of the C(2)-symmetric, optically active, pentacyclic diamine natural product, starting from a chiraldiol is described. The diol is available via an asymmetric Diels-Alder reaction between 1,3-butadiene and di-(-)-menthyl fumarate. The keytransformation in the synthesis is an intramolecular Pd(0)-catalyzed (Stille) coupling reaction to form the central