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A Hg(OTf)2-catalysed vinylogous semipinacol-type rearrangement has been reported for the construction of dihydroquinoline derivatives via a bicyclic aminal (Scheme 135). ... [Pg.515]

A Lewis acid-promoted tandem semipinacol-type 1,2-carbon migration/aldol reaction of trimethylsilane-protected vinylogous a-ketols with aldehyde has been reported for the... [Pg.487]

Recently, Tu group reported an unprecedented vinylogous a-ketol rearrange via semipinacol-type 1,2-carbon migration with cinchona-type catalyst 143, giving products in good yields and up to 97% ee values [73], In the reaction, cis isomer... [Pg.172]