Scheme 1.
Retrosynthetic analysis of azaspiracid-1 (2). PNB = paranitrobenzoate; TBS = tert-butyldimethylsilyl; Boc = tert-butyloxycarbonyl; TBDPS = tert-butyldiphenylsilyl; TES = triethylsilyl; Bn = benzyl.
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