The first totalsynthesis of the antitumoragentroseophilin 1 is reported. Its intricate macrotricycliccore 2 is obtained by means of a new palladium-catalyzed manifold for the formation of ansa-bridged pyrroles which proceeds via vinyl oxirane 8 and allyl lactone 11 as key intermediates. After conversion of the latter into pyrrolophane 14, a base-induced elimination of the sulfone group followed
An improved, efficient preparation of 2-(halomethyl)allyl carboxylates starting from diethylbis(hydroxymethyl)malonate and hydrobromic acid is reported. The allylic halogen of 2-(chloromethyl)acrylate and 2-(bromomethyl)acrylate are readily exchanged during esterification.
Synthesis of sulfonyl 2-aryl-5-methylenyltetrahydropyrans
作者:Meng-Yang Chang、Kuan-Ting Chen
DOI:10.1039/d3ra06370d
日期:——
research describes a high-yield method for the synthesis of sulfonyl 2-aryl-5-methylenetetrahydropyrans by one-pot straightforward DABCO-promoted intramolecular Michael addition of β-sulfonyl styrene with 2-chloromethyl-1-propenol followed by intramolecularalkylation. This Baylis–Hillman-type pathway provides a highly effective stereoselective annulation by forming one carbon–oxygen bond and one carbon–carbon
An Intramolecular Diels−Alder Approach to the Eunicellins: Enantioselective Total Syntheses of Ophirin B and Astrogorgin
作者:Michael T. Crimmins、Brandon H. Brown、Hilary R. Plake
DOI:10.1021/ja056334b
日期:2006.2.1
The enantioselective syntheses of the eunicellins ophirin B and astrogorgin have been completed. Ring-closing metatheses provide efficient access to the oxonene rings, and highly diastereoselective intramolecular Diels-Alder reactions resulted in the formation of the hydrobenzofuran portion of the molecules.
Total Synthesis of the Potent Antitumor Agent Roseophilin: A Concise Approach to the Macrotricyclic Core