虽然 Sharpless 不对称环氧化/动力学拆分提供了以高选择性获得反构型末端环氧醇的途径,但目前还没有类似的顺选择性环氧化工艺。我们报告说,这种“缺失的环节”是由现成的钛 salalen 催化剂提供的。除了烯丙醇外,烯丙醚在低催化剂负载下以极高的顺式选择性环氧化,使用水性 H 2 O 2作为氧化剂。
Oxidative cleavage of mono-, di-, and trisubstituted olefins to methyl esters through ozonolysis in methanolic sodium hydroxide
作者:James A. Marshall、Albert W. Garofalo
DOI:10.1021/jo00066a019
日期:1993.7
The ozonolysis of alkenes in methanolic NaOH or NaOMe with CH2Cl2 as cosolvent leads directly to methyl esters. The procedure has been used to prepare various alpha-, beta, and omega-alkoxy esters, acyloxy esters, and alpha- and beta-N-acyl and N-sulfonyl esters from the appropriate unsaturated ethers, esters, and amides. Other examples include the formation of dimethyl octanedioate from cyclooctene (75% yield), dimethyl nonanedioate and methyl nonanoate from methyl oleate (77 and 78%, respectively), and tetradecanoic acid gamma-lactone from 2-methyl-2-hexadecen-6-ol (80% yield).
Hoveyda, Amir H.; Xu, Zhongmin, Journal of the American Chemical Society, 1991, vol. 113, # 13, p. 5079 - 5080
作者:Hoveyda, Amir H.、Xu, Zhongmin
DOI:——
日期:——
Houri, Ahmad F.; Didiuk, Mary T.; Xu, Zhongmin, Journal of the American Chemical Society, 1993, vol. 115, # 15, p. 6614 - 6624
作者:Houri, Ahmad F.、Didiuk, Mary T.、Xu, Zhongmin、Horan, Nina R.、Hoveyda, Amir H.