| http://www.w3.org/ns/prov#value | - Reaction Scheme 5 illustrates an alternative synthesis of the compounds of Formula I where R7 is optionally substituted alkyl or optionally substituted aryl, and R8 is chosen from hydrogen, ???C(O)???R9, ???S(O)2???R9, ???CH2???R9, ???C(O)???O???R9, ???C(O)???NH???R9 and ???S(O)2???NH???R9, which is particularly suitable for synthesizing the compounds of Formula I where X is ???N???.
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