1
264
M. S. Yusubov et al.
grinding was started. The resulting mixture was extracted with diethyl ether
2 ꢀ 5 mL), and the ether extract was filtered and concentrated on a rotary
evaporator. Recrystallyzation of the residue from hexane-toluene mixtures
ratio of solvents between 10:1 and 3:1) afforded final products 2a–l.
(
(
ACKNOWLEDGMENTS
The authors thank Victor D. Filimonov (Department of Organic Chemistry,
Tomsk Polytechnic University) for helpful discussion. V. V. Z. is thankful
to the National Science Foundation (NSF/CHE-0353541 and NSF-MRI
award CHE 0416157) for partial support of this research.
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