Abstract
The Lewis acid mediated desymmetrizing intramolecular cyclization of prochiral allylstannyl diketone ( 1) gave a mixture of two diastereomers ( 2 and 3). Highly diastereoselective synthesis of each of the diastereomers was accomplished by appropriate choice of the Lewis acid. Compound 3 was also produced stereoselectively by using a palladium catalyst instead of Lewis acid.
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