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Reaction conditions and yields

Compound    Base  Reaction  Yield
 no.              time (h)   (%)

  6         KOtBu  1.5       82

  7         KOtBu  3         64
            KOtBu  2         85
 
  8         K2CO3  2         47
            KOtBu  1.5       87

  9         K2CO3  3         47
            DBU    3         54
            KOtBu  2         51

 10         K2CO3  3         58
            KOtBu  2         78

 11         K2CO3  2         63

 12         K2CO3  2         86

 14         K2CO3  2         44

 15         K2CO3  2         37
            KOtBu  2         88
 
 16         K2CO3  3         75
            DBU    2         58

 17         K2CO3  2         64
            K2CO3  4         52

 19         Cs2CO3 3         55