Über die Darstellung der 7R-Oxirane von 5Z- und 5E-10-Oxo-19-norcholecalciferol
摘要:
The two title compounds 12b and 13b have been prepared by direct oxidation of the corresponding 10-oxo-19-norcolcalciferol derivatives 3c and 4c with MCPBA. The generation of 12b and 13b by treatment of the Delta(7) epoxidized ethylisoxazolin adducts of 5Z- and 5E-cholecalciferol 8a, 86 and 9a, 9b with Mo(CO)(6) failed, since besides the retroaldol cleavage of the heterocycle a deoxygenation of the oxirane with retention of configuration to the Delta(7) double bond occurs.
Über die Darstellung der 7R-Oxirane von 5Z- und 5E-10-Oxo-19-norcholecalciferol
作者:Wolfgang Reischl
DOI:10.1007/bf00811678
日期:1994.1
The two title compounds 12b and 13b have been prepared by direct oxidation of the corresponding 10-oxo-19-norcolcalciferol derivatives 3c and 4c with MCPBA. The generation of 12b and 13b by treatment of the Delta(7) epoxidized ethylisoxazolin adducts of 5Z- and 5E-cholecalciferol 8a, 86 and 9a, 9b with Mo(CO)(6) failed, since besides the retroaldol cleavage of the heterocycle a deoxygenation of the oxirane with retention of configuration to the Delta(7) double bond occurs.
Reischl, Wolfgang, Liebigs Annalen der Chemie, 1993, # 6, p. 587 - 594