Abstract
Aza Wittig-type reactions of iminophosphoranes 21, derived from ethyl α-azido-β-(3-indolyl)propenoates and triphenylphosphine, with methyl isocyanate, carbon dioxide or carbon disulfide provide the corresponding heterocumulenes 22, 25 and 28 which undergo cyclization by the action of nitrogenous reagents completing the assemblage of the framework of aplysinopsin. Further deprotection leads to naturally occurring aplysinopsin analogues.
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