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Studies on chiral thiophosphoric acids and their deriv atives 16.-the asymmetric cyclization of l-(+)- prolinol with (thio)phosphoro(-no)dichloridates
TL;DR: The cyclizations of L-(+)-prolinol 5 with (thio)phosphoro(-no)dichloridates 6 give 1,2,3-azaphosphaoxabicyclo[3.3.0]octanes 7 consisting of unequal amounts of diastereoisomers, eight pairs of which have been successfully resolved by silica gel column chromatography or recrystallization as discussed by the authors.