[O:1]1[C:5]2([CH2:10][CH2:9][CH2:8][C:7](=[O:11])[CH2:6]2)[O:4][CH2:3][CH2:2]1.[CH2:12](Br)[CH:13]=[CH2:14]>>[CH2:14]([C:7]1([OH:11])[CH2:8][CH2:9][CH2:10][C:5]2([O:4][CH2:3][CH2:2][O:1]2)[CH2:6]1)[CH:13]=[CH2:12]The title compound is prepared from 1,4-dioxa-spiro[4.5]decan-7-one and allyl bromide following a procedure analogous to that described in Step 1 of Intermediate 2. Yield: 84% of theory; Mass spectrum (ESI+): m/z=181 [M+H—H2O]+.
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