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Bao Gong Teng

The optically active alkaloid Bao Gong Teng A (42), used to treat glaucoma, has been prepared with methyl (.S )-lac(ale as the auxiliary. The key step was the asymmetric 1,3-dipolar cycloaddition of a 3-hydroxypyridinium betaine with the acrylate 43 where the auxiliary is attached directly to the dienophile (Scheme 23.12). The auxiliary was removed, after several steps, yielding the desired product in optically pure form but in only 9% overall yield.59,60... [Pg.453]

The optically active tropane alkaloid Bao Gong Teng A, isolated from the Chinese herb Erycibe obtusifolia Benth, is an azabicyclo-[3.2.1]octane conpound substituted with an acetate ester and a hydroxyl group. By a regio- and stereocontrolled [5+2] cycloaddition of TpMo(CO)2(q -pyridinyl) scaffold 4 with methyl vinyl ketone 5, the azabicyclo-[3.2.1]octane... [Pg.79]

Yao T, Chen Z, Yi D, Xu G (1981) Chemical study on Bao Gong-teng (Erycibe obtusifolia Benth.). II. Structure of baogongteng A - a new myotic agent. Yaoxue Xuebao 16 582-588 Yunusov SY, Shakirov TT, Plekhanova NV (1958) Alkaloids of Convolvulus subhirsutus. Doklady Akademii Nauk USSR 10 17-20... [Pg.212]

See other pages where Bao Gong Teng is mentioned: [Pg.505]    [Pg.308]    [Pg.570]    [Pg.79]    [Pg.80]    [Pg.642]    [Pg.643]    [Pg.505]    [Pg.308]    [Pg.570]    [Pg.79]    [Pg.80]    [Pg.642]    [Pg.643]    [Pg.211]   
See also in sourсe #XX -- [ Pg.296 ]

See also in sourсe #XX -- [ Pg.570 ]

See also in sourсe #XX -- [ Pg.642 ]



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