MCRs, like the Passerini or the Hantzsch multicomponent reaction, can be utilized to synthesize spiro compounds in an asymmetric manner. Chiral ligands or catalysts may be employed to control the stereochemistry.
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(3R,7aS)-3-phenyl-7a-(3-phenylpropyl)-2,3,7,7a-tetrahydropyrrolo[2,1-b]oxazol-5-one
8-bromo-3-(4-fluorophenyl)-3-methyl-2,3-dihydro-1H-naphtho[2,1-b]pyran
2,5-Pyrrolidinedione, 1-[(4-nitrophenyl)thio]-
(Z)-3-Amino-3-[1-(2-ethoxy-ethoxy)-cyclohexyl]-acrylic acid tert-butyl ester
