Pyrolidines. chiral

Fig. 32 OS supported oiganocatalysts tertiary amine, A -hydroxy-phthalimide and chiral pyrolidines...

Vol. 28, p. 226, ref. 44 for related work). Similar cycloadditions of dienyl pyrrolidinones [le. AT-(peiita-l,3-dienyl)- or -(buta-l,3-dienyl)-pyrolidin-2-one] with the in situ generated acyl nitroso compound derived from benzyl-JV-hydroxy-carbamate with periodate have led to the preparations of racemic pyroUidines 56 and 57 (R = H or Me). The latter compound is thought to exist as a dimer. An asymmetric synthesis of l,S,6-trideoxy-l,5-imino-D-altritol in which the piperidine ring is formed from a pyiidinium ring bearing Seebach s oxazolidinone chiral auxiliary has also been described. ... 

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