See the recent paper in JACS, 2007, 129, 6686-6687 by Takemoto. A good catalyst design for the first report on catalytic enantioselective Patasis type reaction. Usually for Reissert, Petasis type reactions many of the well known catalysts fail to produce good %ee for obvious reasons. They have got good ee but yields are moderate. I feel the yields are considered good for these type of reactions. Also chloroformate is used as a electrophile which is far better that acid chlorides, they have proved once again.
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