Lagerstroemia subcostata Koehn

We use the name demethyllasubine-I and -II for quinolizidols 64a and 65b. b a, Heimia salicifoiia Link and Otto b, Lagerstroemia subcostata Koehne. 

Fuji et al. (16) have recently isolated lasubine-I (64b) and lasubine-II (63b) from Lagerstroemia subcostata Koehne. The structures of these alkaloids have been established by correlation with synthetic compounds (63a and 64a) as well as by analysis of IR, PMR, 13C-NMR, and mass spectra. These alkaloids are listed in Table IV (16, 47, 48, 50, 51). 

Lagerstroemia subcostata Koehne/Subcostata crape myrtle 73 37 17 27 18 7 4 1.5 1.4... 

The Blechert group also applied the tandem RRM process with CM (RCM-ROM-RCM sequence) to the synthesis of (—)-lasubine 11 (141, Scheme 24.36), an alkaloid extracted from the leaves of Lagerstroemia subcostata Koehne. ° This strategy requires a careful choice of substrates and catalysts to avoid the CM reaction before the RRM reaction takes place. Therefore, cyclopentenone 138 was chosen as a starting material from the outcome of their study. In the presence of [Ru]-II (5 mol%), the treatment... 

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See also in sourсe #XX -- [ ]

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