New Options for the Reactivity of the Burgess Reagent with Epoxides in Both Racemic and Chiral Auxiliary Modes - Structural and Mechanistic Revisions, Computational Studies, and Application to Synthesis
reagent with epoxides yields diastereomeric pairs of sulfamidates, which lead to cis and trans aminoalcohols in each enantiomeric series. Experimental and spectral details are provided for all new sulfamidates and the products derivedfrom them. Structure revisions have been made for several previously reported products from the reactions of the Burgess reagent with cyclic oxiranes and styrene diols.
Formal total syntheses of both enantiomers of balanol have been achieved by the preparation of the protected hexahydroazepine core 2. Two complementary routes have been investigated. The first relied on the regioselective opening of 1,2-epoxycyclohex-3-ene with a chiral-auxiliary version of the Burgess reagent to provide a diastereomeric pair of cis-fused cyclic sulfamidates. The sulfamidates were