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Figure 4
The structures of (a) the 1-azaspiro[4.5]decan-2-one skeleton from the database survey and its (b) N-alkyl and (c) N-alkoxy derivatives; R = alkyl or aryl, (d) (4S*,5R*)-6-isopropyl-1-methoxy-4-methyl-1-azaspiro[4.5]deca-6,9-diene-2,8-dione and (e) the title compound; X = (R*)-1-phenylethyl. |
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