prov:value
| - As shown in route c of SCHEME II, compounds of formula (h) may also be obtained by reactions among a carbonyl compound of formula (I), wherein R1, R2 and R3 are as defined in formula (I), and X is an appropriate leaving group such as Cl, Br, OH, OR, SR, NR2, N(OR???)R or the like, and organometallic reagents of formula (j) and (k), wherein A and B are as defined in formula (I), and M is an appropr
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