Selective cleavage of acetals with ZnBr2 in dichloromethane
摘要:
A selective cleavage of acetals of 1,2- and 1,3-diols has been achieved under mild conditions using ZnBr2 in dichloromethane at room temperature. Acetal types cleavable by this procedure include benzylidene, isopropylidene and cyclohexylidene acetals. This method is compatible with several other types of hydroxyl protecting groups such as Bn, Bz, TBDPS, TIPS and TBDMS. (c) 2005 Published by Elsevier Ltd.
The present invention relates to compounds of Formula I that function as inhibitors of BCL6 (B-cell lymphoma 6) activity: wherein X
1
, X
2
, R
1
, R
2
and R
3
are each as defined herein. The present invention also relates to processes for the preparation of these compounds, to pharmaceutical compositions comprising them, and to their use in the treatment of proliferative disorders, such as cancer, as well as other diseases or conditions in which BCL6 activity is implicated.