A Rapid, Asymmetric Synthesis of the Decahydrofluorene Core of the Hirsutellones
摘要:
A tandem ketene-trapping/Diels-Alder cyclization sequence was the pivotal transformation in an efficient, asymmetric synthesis of a decahydrofluorene tricyclic structure possessing eight stereogenic centers and key features of the hirsutellone class of antitubercular natural products. The hirsutellone-like beta-keto ester that was fashioned by this sequence (13 steps; 6% overall yield) demonstrated significant inhibitory activity against Mycobacterium tuberculosis. The mechanism of action of this antitubercular compound is not yet known.
The invention refers to conjugated secondary alkatrienol derivatives, a method of their production and to flavour and perfume compositions comprising them.
Scope and Limitations of 1,3,5-Hexatriene Derivatives in Regioselective Cobalt-Catalyzed Reactions
作者:Anastasia Schmidt、Gerhard Hilt
DOI:10.1021/ol401015e
日期:2013.6.7
Applications of 1,3,5-hexatriene derivatives in atom-economic cobalt-catalyzed transformations, such as the Diels–Alder reaction with alkynes, the 1,4-hydrovinylation reaction with terminal alkenes, and the 1,4-hydrohexatrienylation reaction, are investigated. In all cases, regioselective transformations were found to generate cyclic derivatives such as stilbenes or acyclic products with a high control
The four geometrical isomers of 1,3,5-undecatriene, 1a–d have been prepared (stereospecifically and non-stereospecifically), using either (1) the Wittig reaction, (2) thermal sigmatropic hydrogen shifts, (3) partial reduction of triple bonds by zinc, or (4) organocopper reagents. The thermal behaviour of the four 1,3,5-undecatrienes has been investigated and the products formed have been characterized
The domino intramolecular Diels–Alder approach to 16-oxasteroids
作者:Craig I. Turner、Rachel M. Williamson、Peter Turner、Michael S. Sherburn
DOI:10.1039/b303362g
日期:——
This communication describes the use of the zipper mode domino IMDA strategy for the one step construction of enantiomerically pure steroid-type frameworks.