Esterification of N-protected. alpha.-amino acids with alcohol/carbodiimide/4-(dimethylamino) pyridine. Racemization of aspartic and glutamic acid derivatives
MK Dhaon, RK Olsen, K Ramasamy
Index: Dhaon, Madhup K.; Olsen, Richard K.; Ramasamy, K. Journal of Organic Chemistry, 1982 , vol. 47, # 10 p. 1962 - 1965
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Citation Number: 245
Abstract
Synthesis of the &Furanone 7. The procedure described for the preparation of compound 2 was followed to synthesize the@-furanone 7. From the compound 6 (90 mg, 0.34 mmol), after purification on a Florisil (5 g) column [n-pentane-ethyl acetate (95: 5 vol) as eluant], was obtained pure 7: 65 mg (81% yield); oil; IR (liquid film) 1700, 1625 cm-';'H NMR (CDClJ 6 4.40 (8,
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