was heated for 24 h in an oil bath at reflux. Water was added to
the cooled reaction mixture and then extracted three times with
CH2Cl2 (30 mL each). After being dried with anhydrous Na2SO4,
product 5 was quantified by CG using the internal standard
method.
The products were characterized by 1H NMR, 13C NMR, GC-
MS and HRMS. All these spectroscopic data agreed with those
previously reported for compounds L111b and 5–8.12a
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Acknowledgements
This work was supported by ACC, CONICET, FONCYT and
SECYT. P.M.U. and M.N.L. gratefully acknowledges CONICET
for fellowships.
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