Synthesis and structure of 3,4,5,6-tetrahydro-8-hydroxy-1H,6H-naphtho-[1,2-h]pyrrolo[2,1-e][1,3,6,2]dioxazaboronin-6-one dimer

A highly diastereoselective synthesis (>99%) of a novel chiral dimer obtained from 3,4,5,6-tetrahydro-8-hydroxy-1H,6H-naphtho[1,2-h]pyrrolo[2,1-e][1,3,6,2]dioxaza-boronin-6-one is described and details of the dimer crystal structure are presented.