A-nor-Δ3(5),9(10)-estradiene-2,17-dione 1,a potential precursor for synthesis of some new steroidalcontraceptives,was synthesized from 3β-hydroxy-5α-chloro-6β,19-epoxy-androstane-17-one 6 as the sterting mater al,...A-nor-Δ3(5),9(10)-estradiene-2,17-dione 1,a potential precursor for synthesis of some new steroidalcontraceptives,was synthesized from 3β-hydroxy-5α-chloro-6β,19-epoxy-androstane-17-one 6 as the sterting mater al,which is the key intermediate of steroidal contraceptive of norethindrone,in an overall yield of 25% in 5 steps through the sequence of 5 reactions:(i) oxidative dccyclization,(ii) decarhoxylative cyclization,(iii) reductive decy clization,(iv) dehydroxy methylation,(v) deacetoxylation展开更多
In this study, bergapten was synthesized in a yield of 55% from phloroglucinol as starting material, via a novel approach including monomethylation, Hoesch reaction, acetylation, deacetoxylation, Pechmann condensation...In this study, bergapten was synthesized in a yield of 55% from phloroglucinol as starting material, via a novel approach including monomethylation, Hoesch reaction, acetylation, deacetoxylation, Pechmann condensation and 2,3-dichloro-5,6-dicyano-1,4-benzoquinone(DDQ) dehydrogenation. With the adoption of the acetylation of enol tautomer, the deacetoxylation and the DDQ dehydrogenation, the novel approach differs greatly from the processes reported previously, though the starting material was the same or similar to those used on previous synthetic processes. The newly adopted reaction underwent easily, affording all reactions in high yields, especially acetylation and deacetoxylation and DDQ dehydrogenation in almost quantitative yields, ensuring a final yield higher than those previously reported.展开更多
基金Project supported by the National Committee for Planned ParenthoodNational Laboratory of Contraceptives+1 种基金Devices ResearchShanghai Institute of Planned Parenthood Research
文摘A-nor-Δ3(5),9(10)-estradiene-2,17-dione 1,a potential precursor for synthesis of some new steroidalcontraceptives,was synthesized from 3β-hydroxy-5α-chloro-6β,19-epoxy-androstane-17-one 6 as the sterting mater al,which is the key intermediate of steroidal contraceptive of norethindrone,in an overall yield of 25% in 5 steps through the sequence of 5 reactions:(i) oxidative dccyclization,(ii) decarhoxylative cyclization,(iii) reductive decy clization,(iv) dehydroxy methylation,(v) deacetoxylation
基金supported by the Project of Department of Science and Technology of Zhejiang Province, China (No.2021C04021).
文摘In this study, bergapten was synthesized in a yield of 55% from phloroglucinol as starting material, via a novel approach including monomethylation, Hoesch reaction, acetylation, deacetoxylation, Pechmann condensation and 2,3-dichloro-5,6-dicyano-1,4-benzoquinone(DDQ) dehydrogenation. With the adoption of the acetylation of enol tautomer, the deacetoxylation and the DDQ dehydrogenation, the novel approach differs greatly from the processes reported previously, though the starting material was the same or similar to those used on previous synthetic processes. The newly adopted reaction underwent easily, affording all reactions in high yields, especially acetylation and deacetoxylation and DDQ dehydrogenation in almost quantitative yields, ensuring a final yield higher than those previously reported.
