Abstract
[reaction: see text] The first stereospecific total synthesis of the sarpagine indole alkaloids (E)16-epiaffinisine (1), (E)16-epinormacusine B (2), and dehydro-16-epiaffinisine (4) has been completed; this method has also resulted in the synthesis of dehydro-16-epinormacusine B (5). The formation of the required ether in both 4 and 5 was realized with complete control from the top face on treatment of the corresponding alcohols with DDQ/THF in 98% and 95% yields, respectively.
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