Add time:07/20/2019         Source:sciencedirect.com

1, 5-Bis(trimethylsiloxy)-1, 5-dimethoxy-1, 4-pentadienes (7) can be prepared in good yield by silylation of the dianions of dimethyl glutarates (8). On treatment with titanium tetrachloride, 7 cyclise stereoselectively to dimethyl trans-cyclopropane-1, 2-dicarboxylates 10. Reaction of 7 with acetic anhydrode and titanium tetrachloride gives substituted cyclobutanes 22b–d.

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