A novel regio- and stereocontrolled synthesis of diol epoxide and trans-dihydriol metabolites of polycyclic aromatic hydrocarbons. An application to the synthesis of the bay-region syn- and anti-diol epoxides of the carcinogen 1,4-dimethylphenanthrene
作者:Masato Koreeda、Kee Yong Jung、Mitsuru Hirota
DOI:10.1021/ja00176a062
日期:1990.9
stereochemically controlled synthesis of these metabolites, particularly the bay-region analogues. The authors delineate a generally applicable, efficient synthesis of PAH diolepoxides and trans-dihydrodiols and its application to the first synthesis of the putative activemetabolites, the bay-region diolepoxides of the carcinogen 1,4-dimethylphenanthrene (1,4-DMPh).
Stereocontrolled synthesis of syn- and anti-diol epoxide metabolites of triphenylene
作者:Masato Koreeda、Ramesh Gopalaswamy、Jinhai Yang、Roeland J. Tuinman
DOI:10.1016/0040-4039(96)01896-5
日期:1996.11
The synthesis of both syn- and anti-diol epoxide metabolites of triphenylene has been achieved under complete stereochemical control commencing with commercially available 9-phenanthrol in 18% (9 steps) and 37% (8 steps) overall yields, respectively. The exceptionally high stereoselectivity of the dimethyldioxiraneoxidation of trans-dihydrodiol having the quasi-diaxially disposed hydroxyl groups is
Diels–Alder Reaction of Dimethyl Acetoxymethylenemalonate with 3,4-Dialkoxyfurans and the Utility of Its Adducts in the Stereospecific Synthesis of Lyxopyranosyl C-Glycosides
Dimethyl lyxopyranosylmalonates were synthesized in stereospecific manner from the adducts obtained from Diels–Alder reaction of 3,4-dialkoxyfurans and dimethyl acetoxymethylenemalonate, through retrogradealdolC–Cbondfissionunderreductive condition as a key step.
Rapid and efficient synthesis of a fully functionalized synthon for the bottom half of the antiparasitic agent, ivermectin
作者:Michael E. Jung、Yoshihiro Usui、Chi Truc Vu
DOI:10.1016/s0040-4039(00)96841-2
日期:1987.1
The preparation of the bottomhalf of ivermectin 3 in 10 steps and 9% overall yield is reported.
据报道,伊维菌素3的下半部分分十步制备,总产率为9%。
Chemoselective cycloadditions of 3,4-dialkoxyfurans and alkyl coumalates. Novel loss of aromaticity of two nonbenzenoid aromatic rings in a mild thermal process
作者:Michael E. Jung、Leslie J. Street、Yoshihiro. Usui
DOI:10.1021/ja00281a062
日期:1986.10
either dienes or dienophiles in cycloadditions depending on their reaction partners. They have often been used as dienophiles with simple substituted butadienes 2, giving good yields of the Diels-Alder adducts 3 involving the 5,6-double bond of the pyrone as the dienophile, a useful process for trichothecane synthesis3 However, with highly electron-rich olefins, e.g., the ketene acetal 4, they react as