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The combination of alkene metathesis and beta-fragmentation offers an efficient entry into (Z)-configured medium-ring cycloalkenes. The versatility of this method is demonstrated by the total synthesis of Periplanone C, a semiochemical of Periplaneta americana. [reaction: see text]
The combination of ring closing metathesis and beta-fragmentation offers an efficient entry into (Z)-configured medium ring cycloalkenes. The fragmentation step can be effected under anionic or radical conditions. The versatility of this method is demonstrated by the total synthesis of (+/-)-periplanone C-a macrocyclic pheromone of Periplaneta americana.
According to the World Health Organization (WHO) data presented in November 2011, one third of the world's population was infected with the TB bacillus. The incidence of new TB cases in 2010 was 9.5 million with 14 million prevalent cases, most of which occurred in the South-East Asia region. The chief aim of the study was to show the spread of tuberculosis… (More)