New Stereoselective Route to the Epoxyquinol Core of Manumycin-Type Natural Products. Synthesis of Enantiopure (+)-Bromoxone, (−)-LL-C10037α, and (+)-KT 8110
作者:Oliver Block、Georg Klein、Hans-Josef Altenbach、David J. Brauer
DOI:10.1021/jo991324c
日期:2000.2.1
manumycin-type compounds. Starting fromp-benzoquinone, optically pure compounds in both forms can be prepared via enzymatic resolution of a derived diacetoxy conduritol. A diepoxy aminoinositol is accessible which can function for formation of enantiopure epoxyquinones and quinols. Examples are given for acylation reactions of this amine with several acyl derivatives. With this approach (-)-LL-C10037alpha and quinones
Stereoselective synthesis of several azido/amino- and diazido/diamino-myo-inositols and their phosphates from p-benzoquinone
作者:Michael A. L. Podeschwa、Oliver Plettenburg、Hans-Josef Altenbach
DOI:10.1039/b302622a
日期:——
A practical route is described for the preparation of azido-myo-inositols, amino-myo-inositols and azido-conduritol B derivatives. Starting from p-benzoquinone, optically pure compounds in both forms can be prepared via enzymatic resolution of a derived diacetoxy conduritol B derivative. Selective introduction of nitrogen-containing functional groups in four of the six possible positions in the cyclitol moiety is followed by further functionalization to yield the target compounds.
描述了一条实用路线,用于制备叠氮酚-肌醇、氨基-肌醇和叠氮-坤酮 B 衍生物。以对苯醌为起始材料,可以通过对一种衍生的二醋酸酯坤酮 B 衍生物的酶催化分离制备光学纯的化合物。这些化合物的环醇基团中六个可能位置中,有四个位置选择性引入含氮官能团,随后进行进一步的功能化,以获得目标化合物。
A bireactant, irreversible, active-site-directed inhibitor of β-d-galactosidase (Escherichia coli). Synthesis and properties of (1/2,5,6)-2-(3-azibutylthio)-5,6-epoxy-3-cyclohexen-1-ol
作者:Reuben E. Huber、Jochen Lehmann、Lothar Ziser
DOI:10.1016/s0008-6215(00)90528-7
日期:1991.8
(1/2,5,6)-2-(3-Azibutylthio)-5,6-epoxy-3-cyclohexen-1-ol** (1) was synthesized and was found to irreversibly inactivate beta-D-galactosidase (Escherichia coli). The inactivation was prevented by the presence of isopropyl 1-thio-beta-D-galactopyranoside (IPTG). The vinyloxirane group of 1 reacted with water and other nucleophiles, especially at higher pH values. Reaction of 1 with beta-D-galactosidase was slow enough so that a competitive-inhibition constant (K(i)) of 29mM could be determined. The inhibition constant for (1,2/3,6)-6-3-azibutylthio)-2-bromo-4-cyclohexene-1,3-diol (2), the precursor of the bireactant inhibitor 1, was 13mM, while that of (1,3/2,4)-3-(3-azibutylthio)-5-cyclohexene-1,2,4-triol (3), the product formed when the reactant is allowed to react with water, was 23mM. After irradiation by light, beta-D-galactosidase that had initially been treated with the bireactant compound and then digested with trypsin, showed a new pattern of elution from h.p.l.c., indicating that there was reaction at two regions of the beta-D-galactosidase molecule.
Flexible Stereo- and Regioselective Synthesis ofmyo-Inositol Phosphates(Part 2): Via Nonsymmetrical Conduritol B Derivatives
作者:Michael A. L. Podeschwa、Oliver Plettenburg、Hans-Josef Altenbach
DOI:10.1002/ejoc.200400918
日期:2005.7
myo-inositol phosphates. Optically pure compounds can be prepared, in both forms, from p-benzoquinone by enzymatic resolution of a diacetoxyconduritol key intermediate. Monosubstituted inositol derivatives can be obtained by breaking the C2 symmetry of conduritolBderivatives. A wide variety of myo-inositol phosphates can be synthesized by combining the previously reported symmetrical approach with
The absolute configurations of anti-benzene and anti-naphthalene 1,2:3,4-dioxides
作者:Masato Koreeda、Minoru Yoshihara
DOI:10.1039/c39810000974
日期:——
Optically active anti-1,2 : 3,4-dioxides of benzene and naphthalene have been synthesized and their absoluteconfigurations assigned using the exciton chirality c.d. method.