Weissenberg, M., Department of Organic Chemistry, Weizmann Institute of Science, Rehovot, Israel Lavie, D., Department of Organic Chemistry, Weizmann Institute of Science, Rehovot, Israel Glotter, E., Faculty of Agriculture, Hebrew University of Jerusalem, Rehovot, Israel
Several cholestane derivatives possessing rings A and B with the same substitution pattern as in the naturally occurring steroidal lactones of the withanolide group have been synthesised: 4β-hydroxycholesta-2,5-dien-1-one (10), 5,6β-epoxy-4β-hydroxy-5β-cholest-2-en-1-one (12), cholesta-2,5-dien-1-one (19), and 5,6β-epoxy-5β-cholest-2-en-1-one (21). Several other compounds in which rings A and B have a substitution pattern not yet encountered among the natural withanolides have also been prepared: 5,6α-epoxy-4β-hydroxy-5α-cholest-2-en-1-one (11), 5,6α-epoxy-5α-cholest-2-en-1-one (20), and 4α-acetoxy-5- hydroxy-5β-cholest-2-en-1-one (28).
1-oxo-steroids. Part 2. Model studies for the synthesis of the withanolides
Weissenberg, M., Department of Organic Chemistry, Weizmann Institute of Science, Rehovot, Israel Lavie, D., Department of Organic Chemistry, Weizmann Institute of Science, Rehovot, Israel Glotter, E., Faculty of Agriculture, Hebrew University of Jerusalem, Rehovot, Israel
1-oxo-steroids. Part 2. Model studies for the synthesis of the withanolides
Several cholestane derivatives possessing rings A and B with the same substitution pattern as in the naturally occurring steroidal lactones of the withanolide group have been synthesised: 4β-hydroxycholesta-2,5-dien-1-one (10), 5,6β-epoxy-4β-hydroxy-5β-cholest-2-en-1-one (12), cholesta-2,5-dien-1-one (19), and 5,6β-epoxy-5β-cholest-2-en-1-one (21). Several other compounds in which rings A and B have a substitution pattern not yet encountered among the natural withanolides have also been prepared: 5,6α-epoxy-4β-hydroxy-5α-cholest-2-en-1-one (11), 5,6α-epoxy-5α-cholest-2-en-1-one (20), and 4α-acetoxy-5- hydroxy-5β-cholest-2-en-1-one (28).