Z-2-phenyl-4-[(S)-2,2-dimethyl-1,3-dioxolan-4-ylmethylen]-5(4H)-oxazolone as the dienophile in asymmetric diels-alder reactions. II
摘要:
Diels-Alder reaction of Z-2-phenyl-4-[(S)-2,2-dimethyl-1,3-dioxolan -4-ylmethylen]-5(4H)-oxazolone and Danishefsky's diene is studied. Thermally induced reaction took place at room temperature with a high diastereofacial selectivity and Diels-Alder adducts, obtained in very high diastereomeric purity, were easily transformed into valuable compounds. The stereochemistry of the adducts has been elucidated by single crystal X-ray structure determinations, H-1-NMR analysis and mechanistic considerations. Copyright (C) 1996 Elsevier Science Ltd
Z-2-phenyl-4-[(S)-2,2-dimethyl-1,3-dioxolan-4-ylmethylen]-5(4H)-oxazolone as the dienophile in asymmetric diels-alder reactions. II
摘要:
Diels-Alder reaction of Z-2-phenyl-4-[(S)-2,2-dimethyl-1,3-dioxolan -4-ylmethylen]-5(4H)-oxazolone and Danishefsky's diene is studied. Thermally induced reaction took place at room temperature with a high diastereofacial selectivity and Diels-Alder adducts, obtained in very high diastereomeric purity, were easily transformed into valuable compounds. The stereochemistry of the adducts has been elucidated by single crystal X-ray structure determinations, H-1-NMR analysis and mechanistic considerations. Copyright (C) 1996 Elsevier Science Ltd