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Abstract 3‐Oxopregn‐4‐ene‐20β‐carboxaldehyde ( 1 ) was condensed with several β‐aminoalcohols and β‐aminothiols to form oxazolidine and thiazolidine derivatives. Condensation of 1 with o ‐aminothiophenol gave the corresponding benzothiazoline 16 , while condensation of 1 with o ‐aminophenol gave the open‐chain o ‐hydroxyaldimine 18 .
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Golander et al. (1979) studied this question.
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