• YAKHAK HOEJI
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• v.37 no.3
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• pp.290-294
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• 1993

An efficient synthetic route to the trisubstituted cyclopentane as an useful synthetic intrermediate for carbaprostacyclin is described. Ireland Claisen rearrangement of a hydroxylactone has been employed as a key reaction.

• YAKHAK HOEJI
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• v.34 no.3
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• pp.166-170
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• 1990

An efficient synthetic route to macrolide is described. Eight-membered lactone was synthesized via palladium catalyzed intramolecular alkylation of allylic carbonate in high yield.

• Applied Chemistry for Engineering
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• v.17 no.6
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• pp.633-637
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• 2006

In this study, the efficient large-scale synthetic route for itraconazole, triazole antifungal agent, was developed. The original synthetic route for medicinal chemistry reported by Janssen Pharmaceutica was linear (14 linear steps) starting from 2,4-dichloroacetophenone with the total yield of 1.4%, and potential hazardous materials such as methanesulfonyl chloride ($CH_{3}SO_{2}Cl$), hydrogen gas, and sodium hydride (NaH) were used. Furthermore, the expensive 1-acetyl-4-(4-hydroxyphenyl)piperazine and palladium were used in this medicinal chemistry route, thus the manufacturing cost would be practically high. In order to improve the commercial route, we developed the process of 12 step convergent synthesis combining two intermediates which are roughly halves of itraconazole with the total yield of 12.0%, and hazardous materials and expensive reagents were excluded in this process, thus the manufacturing cost could be cut down to a great extent.

• Bulletin of the Korean Chemical Society
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• v.14 no.4
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• pp.437-438
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• 1993

• Archives of Pharmacal Research
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• v.14 no.2
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• pp.143-146
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• 1991

A new synthetic sequence for the chiral lactone moiety of compactin was developed from $\alpha$-D-glucose in 9 steps via simultaneous reductive detosylation and epoxide-ring opening of 2, 3-epoxy-4-tosylate using NaBH_4$ to afford 2, 4-dideoxy sugar as a key intermediate.

• Archives of Pharmacal Research
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• v.17 no.4
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• pp.249-255
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• 1994

An efficient synthetic method for 11-deoxyanthracycline AB synthons is described. A verstile key intemediate vinyl bromide 3 was prepared from 5- methodxy-1-tetralone in three steps, and then was converted to the allylic alcohols 4 and 8 which, in tum, fumished highly fuctionalized AB synthons 7 and 12, respectively, via sequential epoxidation-reduction-protection processes.

• YAKHAK HOEJI
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• v.39 no.1
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• pp.41-47
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• 1995

An efficient and stereoselective synthetic route to the trisubstituted hydroxy cyclopentane as an useful synthetic intermediate for carbaprostacyclin is described. Pd(0)-mediated intramolecular alkylation of allylic carbonate has been employed as a key reaction.

• YAKHAK HOEJI
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• v.47 no.5
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• pp.283-287
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• 2003

Isoflavonoids are abundant in natural products and reported with many synthetic variations. However, relatively few quinolone analogs of isoflavonoids have been described. As part of our endeavor to pursue biologically active novel isoflavonoids, we report an efficient synthetic route for quinolone analogs of isoflavonoids. The key intermediate, 2'-aminochalcone 2 was obtained from substituted aniline and cyclized to afford quinolones 6, 8a, and 8b.

• Bulletin of the Korean Chemical Society
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• v.32 no.spc8
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• pp.2949-2954
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• 2011

This paper describes a concise and efficient synthetic route for the biologically interesting pyranoxanthones, dihydropyranoxanthones, and their derivatives. The key strategies involve pyranyl ring formation, methylation, catalytic hydrogenation, and catalytic dihydroxylation starting from 1,3-dihydroxyxanthen-9-one.

• YAKHAK HOEJI
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• v.35 no.4
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• pp.264-270
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• 1991

An efficient synthetic route to carbocycle is described. 1, 1, 2-Trisubstituted cycloheptane has been synthesized from allylic carbonate by Pd(0) catalzyed cyclization.