Helvetica Chimica Acta p. 2572 - 2582 (1992)
Update date:2022-07-30
Topics:
Oppolzer, Wolfgang
Lienard, Philippe
Heating diastereoisomerically pure N-acylsultams 3 or 4 with allyl alcohol/Ti(OR)4 efficiently yields sultams 1 or 2 and allyl esters 5.Esters 5 are hydrolyzed under nonbasic conditions in the presence of Wilkinson's catalyst to give enantiomerically and diastereoisomerically pure carboxylic acids 7.A series of <(fluoren-9-yl)methoxy>carbonyl-(Fmoc)-protected amino acids 14 were thus prepared from N-
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