N. M. Callis et al. / Tetrahedron Letters 48 (2007) 8128–8131
8131
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1
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1
9; (b) Semagina, N. V.; Bykov, A. V.; Sulman, E. M.;
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(2 mL), H (gas bag), rt, 4 h. The organic phase was passed
through a Celite pad. The next reaction was carried out
with the same reaction flask and the same magnetic
stirring bar. Total conversion was obtained for the first
four cycles and 2a was isolated, respectively, in 95, 97, 96
and 95% yield. In the 5th cycle, conversion dropped to
85%.
2
73–284.
1
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