Abstract
Arylboration of carbonyl compounds with a novel diboron reagent — 1,6-bis(dipropylboryl)-2,4-hexadiene — proceeds in a regio- and stereospecific way to give exclusivelyd,l-diastereomers of the corresponding 2,3-divinylsubstituted 1,4-diols. Their iodocyclization allowed preparation of 3,7-dioxabicyclo[3.3.0]octane derivatives withcis-junction of the tetrahydrofuran rings.
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