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Wang et al., (1998) did not point out the regime of the chaotic control parameter. By analyzing the Lyapunov exponent of Wang-Smiths's chaotic simulated annealing (CSA) in detail, a lower bound for chaotic control parameter of Wang-Smiths's model is given. Computer simulation results agree with the theoretical prediction
An efficient synthetic method for the construction of trans-tetrahydrofuran (THF) unit from trans-1,5,9-decatriene was successfully developed by means of Sharpless AD reactions and oxidative cyclizations catalyzed by Co(modp) 2 under an oxygen atmosphere. Based on this new synthetic strategy, the trans-mono-THF unit, trans-bis-THF unit and trans-tris-THF unit in Annonaceous acetogenins were...
A highly efficient synthetic method for the trans/threo/trans- bis-tetrahydrofuran (THF) ring building block was established. The title compound was synthesized in thirteen steps from trans-1,4-dichloro-2-butene via a convergent route with a Wittig reaction as the key step. The absolute configuration of the THF segment of naturally occurring asimilobin should be corrected.
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