The nucleophile in this reaction is trimethylsilylacetylene (TMSA). The nucleophilic addition of TMSA to the N-phosphinoylimine involves the attack of the acetylene carbon on the electrophilic center of the imine, forming a carbon-carbon bond.
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(2S,2'S)-1,1'-(5-methyl-1,3-phenylene)bis(methylene)dipyrrolidine-2-carboxylic acid
