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。
Nakajima et al., Chemische Berichte, 1959, vol. 92, p. 163,166,170
作者:Nakajima et al.
DOI:——
日期:——
Cyclitols. III. Some Tosyl Esters of Inositols. Synthesis of a New Inositol<sup>1,2</sup>
作者:S. J. Angyal、N. K. Matheson
DOI:10.1021/ja01621a047
日期:1955.8
Protecting Group-Directed, Diastereoselective Samarium Diiodide-Promoted Carbocyclization: Application to the Synthesis of Cyclitols
An efficient routefrom myo- to neo-inositol is described. The key steps of the sequence are oxidation of the hydroxy group at C-5 to the corresponding ketone, followed by a highly (dr = 7.8:1) stereoselective reduction. The route includes nine steps with an overall yield of 51% and is therefore superior to all hitherto reported methods for the preparation of neo-inositol.