Allyl sulfones reductive desulfurization

LAH-CuCh used in moderate to large excess desulfurizes sulfides and dithioketals in good to very good yields (55-87%), but with allyl sulfides, migration of the double bond occurs. Finally vinyl phenyl sulfones are reductively cleaved in good yields (65%) without reduction of C=-C bonds even by an excess of reagent. ... 

In a similar strategy, the organocatalyzed addition of p-keto BT-sulfones to JV-Boc-protected imines, followed by reduction or desulfurization of the resulting adducts, affords optically active trans-allylic amines 65 or p-aminoketones f Scheme 19.291. This reaction was extended to iV-aryl imines and BT-sulfones bearing an ester, an amide, or a ketone at the p-position to give the corresponding Michael acceptor 66 in good to excellent yields. 

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