The term "formal [3+3] cycloaddition" suggests that the reaction is conceptually similar to a cycloaddition, even though it may not proceed through a classical pericyclic mechanism. In this case, the azomethine ylide and 3-indolylmethanol combine to form a six-membered piperidine ring.
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(1'S,3S)-diethyl-1-benzyl-1'-(4-nitrophenyl)-2-oxo-1',2'-dihydrospiro[indoline-3,4'-pyrido[3,4-b]indole]-3',3'(9'H)-dicarboxylate
dimethyl 2-allyl-2-(5-(4-methoxyphenyl)penta-2,4-diynyl)malonate
