The (+)- and (-)-[2-(1,3-dithianyl)]myrtanylborane. Solid and stable monoalkylboranes for asymmetric hydroboration

Both (+)- and (−)-myrtenyldithiane derivatives were independently prepared from commercially available chiral precursors and were easily, and in one step, converted by means of borane complexes into solid and stable chiral monoalkylboranes. (+)- and (−)-[2-(1,3-dithianyl)]myrtanylborane (MDBH 2 ). These new chiral reagents, when tested on representative classes of olefins, present a reactivity profile similar to IpcBH 2 : they achieve the asymmetric hydroboration of trisubstituted double bonds with high asymmetric induction