A highly efficient synthetic method for the trans/threo/trans- bis-tetrahyd
rofuran (THF) ring building block was established. The title compound was s
ynthesized in thirteen steps from trans-1,4-dichloro-2-butene via a converg
ent route with a Wittig reaction as the key step. The absolute configuratio
n of the THF segment of naturally occurring asimilobin should be corrected.
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