DOI:
10.1055/s-00000084
Synthesis
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References
TsCl: Although the use of TsCl for selective tosylation of 8 was reported, the recovered yield of 7 was very low and a serious problem was that tosylated 7 and 8 could not be recycled, see: Gras J.-L, Nouguier R, Mchich M.
Tetrahedron Lett. 1987;
28: 6601
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