Abstract
Aza/Wittig-type reactions of iminophosphorane 8, derived from ethyl α-azido-β-(3-indolyl)propenoate and triphenylphosphine. with methyl isocyanate, carbon dioxide or carbon disulfide lead to the corresponding heterocumulenes 9, 10, and 11 which undergo cyclization by the action of nitrogenous reagents to give Aplysinopsine derivatives.
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