Abstract
A second bite of the apple: A new and highly efficient synthesis of the propargylic mesylate fragment of azadirachtin has been accomplished (see scheme; Bn = benzyl, Ms = methanesulfonyl, PMB = para-methoxybenzyl, TBDPS = tert-butyldiphenylsilyl). An enantioselective catalytic hetero Diels-Alder reaction sets up the stereocenter at C15, which then controls the installation of the remaining functionality in a total of only 17 steps.
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