prov:value
| - In step 4, (105) is prepared by forming the ring containing R47 by (1) incubating (104) in a polar organic solvent, typically an alkanol containing 1, 2, 3, 4, 5 or 6 carbon atoms, such as methanol or ethanol, containing a mild base such as NH3, TEA (triethylamine), DBU (1,8-diazabicyclo[5.4.0]undec-7-ene) or (2) refluxing in ethanol in the presence of potassium fluoride.
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