BICYCLIC TETRAHYDROFURAN DERIVATIVES, AND PROCESS FOR PREPARING THEM

摘要

Novel bicyclic tetrahydrofuran derivatives, and a process for preparing the same compounds are provided to improve efficiency of preparation, so that they are useful as intermediates for synthesis of natural products. The bicyclic tetrahydrofuran derivatives represented by the formula(1) are provided, wherein n is 1 or 2; R is phenyl group or substituted phenyl group by C1-C6 alkyl group, C1-C6 alkoxy group, hydroxy group or C1-C6 hydroxyalkyl group; and R1 is C1-C6 alkyl group. The bicyclic tetrahydrofuran derivatives represented by the formula(1) are prepared by intramolecular cyclizing tetrahydrofuran-allenol derivatives in the presence of alcohol compounds, transition metal catalyst and carbon monoxide(CO), wherein the transition metal catalyst is palladium chloride or copper chloride; and the reaction temperature is 0 to 25 deg.C.