Catalytic double osmylation is described for a series of cyclohexadienes in acetone/H2O in the presence of the co-oxidant N-methylmorpholine N-oxide (NMO). The formation of polyols occurred stereospecifically with cyclohexadienes 3,7, and 11a, leading thereby to tetrols 5a, and 9a and to allo-inositol (14a), respectively. To the contrary, trans-cyclohexadiene-diol 15a gave a mixture of the stereoisomeric
描述了在共氧化剂N-甲基吗啉N-氧化物(NMO)存在下在丙酮/ H 2 O中的一系列环己二烯的催化双渗透作用。多元醇的形成与环己二烯立体有择发生3,7,和11a中,从而导致四醇5A,以及图9a和同种异体肌醇(14A分别地)。相反,反式-环己二烯二醇15a给出了立体异构肌醇18a(epi),19a(neo)和20a(手电筒)。高场NMR使多羟基化衍生物的构象分析更加清晰。
Facile Enantiospecific Synthesis of Dihydroconduritols E and F
作者:Kavirayani Prasad、Amit Pawar
DOI:10.1055/s-2008-1067261
日期:2008.10
An enantiospecific synthesis of cyclohexane-1,2,3,4-tetrols was accomplished from l-(+)-tartaric acid. Pivotal steps in the synthetic sequence include zinc-mediated Boord-type fragmentation of an acetonide, ring-closing metathesis (RCM), and osmium-mediated dihydroxylation.
Recherches dans la série des cyclitols XVI. Sur quelques cyclohexane-tétrols-1,2,3,4
作者:Th. Posternak、H. Friedli
DOI:10.1002/hlca.19530360131
日期:——
ont préparé les substances suivantes et en ont établi la configuration: d,l-cyclohexane-tétrol-1, 2/3,4 (Ia + Ib), d,l-cyclohexane-tétrol 1,3/2,4 (II), d,l-cyclohexane-tétrol-1,2,3/4 (VIII), d,l-cyclohexane-tétrol-1,2,4/3 (IX) et cyclohexane-tétrol-1,4/2,3 (III) (dihydro-conduritol). Par oxydation biochimique incomplète, les substances I, VIII et IX ont fourni des tétrols résiduels lévogyres.
Facile Stereoselective Syntheses of Four of the Six 1, 2, 3, 4-Cyclohexanetetrols: Increasing the Accessibility of Cyclitols for Probing the Molecular Recognition of Saccharides
作者:Chia-Yu Huang、Larry A. Cabell、Eric V. Anslyn
DOI:10.1080/00397919408010592
日期:1994.10
Abstract New and stereoselective syntheses of (1,2,3/4)-, (1,2/3,4)-, (1,4/2,3)-, and (1,2,4/3)-cyclohexanetetrols (1, 2, 3, and 4 respectively) are described. The known syn and anti 1,4-cyclohex-2-enediols 9 and 10 were used as starting materials. Diols 9 and 10 were allow to react with OsO4 to directly form 3 and 1 respectively. Diols 9 and 10 were epoxidized with MCPBA, which yielded 4 and 2 after
Dihydroxylation of Polyenes Using Narasaka's Modification of the Upjohn Procedure
作者:Andreas Gypser、Dominique Michel、David S. Nirschl、K. Barry Sharpless
DOI:10.1021/jo980850l
日期:1998.10.1
Dihydroxylation of a variety of commercially available polyenes has been investigated using phenylboronic acid, N-methylmorpholine N-oxide (NMO), and osmium tetroxide in anhydrous solvent. The diastereoselectivity of multiple oxidation steps is in some cases affected by the in situ protection of the intermediate ene-diols as phenyboronic esters, affording polyols not available from the standard Upjohn dihydroxylation procedure. A convenient oxidative deprotection of the phenylboronic esters is also described.