Journal
ORGANIC LETTERS
Volume 9, Issue 12, Pages 2365-2368Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol070764k
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An efficient procedure for highly chemo- and stereoselective cyclization of (S)-allylalanine derivatives is reported (diastereomeric ratios up to 96:4) where the reaction course can be completely controlled by switching from gamma-lactones to cyclic carbamates simply with the proper choice of the amino acid protecting groups. Both processes are stereoconvergent and afford the (S,S)-products in high yields, short reaction times, and mild reaction conditions.
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