Abstract
Two one-pot oxidative annulative approaches to spiroacetal synthesis are described. One approach uses a Lewis acid mediated Ferrier reaction in the fragment-coupling stage followed by DDQ-promoted oxidative carbon-hydrogen bond cleavage and cyclization. An alternative approach employs a Heck reaction for fragment coupling followed by DDQ-mediated enone formation and cyclization. These strategies provide convergent routes to common subunits in natural products, medicinal agents, and chemical libraries under mild reaction conditions.
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