scheme12

Scheme 12. α, β-unsaturated butyrolactones/valerolactones 27 as 2C synthons for construction of spirobutyrolactone/valerolactones.
Scheme 12. α, β-unsaturated butyrolactones/valerolactones 27 as 2C synthons for construction of spirobutyrolactone/valerolactones.
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