Total Synthesis of Polyene Natural Product Dihydroxerulin by Mild Organocatalyzed Dehydrogenation of Alcohols
作者:Hexin Xie、Shilei Zhang、Hao Li、Xinshuai Zhang、Sihan Zhao、Zian Xu、Xixi Song、Xinhong Yu、Wei Wang
DOI:10.1002/chem.201103325
日期:2012.2.20
Polyene synthesis: An efficient approach to the total synthesis of polyene naturalproduct dihydroxrulin (1) is described. A novel, mild, direct organocatalytic IBX‐mediated dehydrogenation process of simple alcohols to enals has been developed, which serves as a key step in the synthesis (see scheme).
Synthese von ?-Acetyl-?-methylenpolyencarbons�ureestern
作者:Hartmut Laatsch、Alke Pudleiner
DOI:10.1002/prac.19943360806
日期:——
The alpha-methylenpolyene carboxylic acids 1 and 2 are highly active against Gram-positive bacteria. If this activity arises from an interference with the cell membranes, then an abrupt change in biological properties is to be expected with growing chain length of simple model compounds. To make these tests possible, we describe here the synthesis of a series of homologue esters of type 40. Their synthesis was achieved by Wittig reactions of polyene alpha,omega-dialdehydes 6 with acetyl-methylentriphenylphosphoran 5a and the protected carboxymethylmethylen triphenylphosphonium salt 8.