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Spiroacetal biosynthesis: (+/-)-1,7-dioxaspiro[5.5]undecane in Bactrocera cacuminata and Bactrocera oleae (Olive
Brett D Schwartz1, Christopher S P McErlean, Mary T Fletcher
1Department of Chemistry, The University of Queensland, Brisbane, Australia 4072, and Institute of Biology, NCSR "D", 15310 Ag. Paraskevi Attikis, Greece.
Abstract:
[reaction: see text] A biosynthetic scheme rationalizing the formation of (+/-)-1,7-dioxaspiro[5.5]undecane (5) in the fruit fly species Bactrocera cacuminata and Bactrocera oleae (olive fruit fly) is presented. Incorporation studies with deuterium-labeled keto aldehyde (10), 1,5-nonanediol (11), and 1,5,9-nonanetriol (12), and our previous finding that both oxygen atoms of 5 originate from dioxygen, are strongly evidentiary. The racemic condition of the natural spiroacetal 5 is accounted for, and inter alia, it is demonstrated that dihydropyran (18) is not an important intermediate en route to 5.

