Products from furans. VI. Synthesis of dihydro-2-disubstituted-2 H -pyran-3(4 H )-ones, tetrahydro-3-(aminomethyl)-2-( p -methoxyphenyl)-2-methyl-2 H -pyran-3-ol derivatives and 6-( p -methoxyphenyl -6-methyl-7-oxa-1,3-diazaspiro[4,5]decane-2,4-dione
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Products from furans. VI. Synthesis of dihydro-2-disubstituted-2 H -pyran-3(4 H )-ones, tetrahydro-3-(aminomethyl)-2-( p -methoxyphenyl)-2-methyl-2 H -pyran-3-ol derivatives and 6-( p -methoxyphenyl -6-methyl-7-oxa-1,3-diazaspiro[4,5]decane-2,4-dione