A new and versatile synthesis of 3-substituted oxetan-3-yl methyl alcohols
作者:Scott Boyd、Christopher D. Davies
DOI:10.1016/j.tetlet.2014.06.024
日期:2014.7
We have developed a novel route for the efficient synthesis of pharmaceutically significant 3-substituted oxetan-3-yl methyl alcohols starting from readily available malonates. The synthesis harnesses the diversity of malonate chemistry and allows access to a range of oxetanes, which exemplifies the versatility of this procedure.
for the one-step formation of sultones from α,ω-alkenols and trifluoromethylsulfonyl chloride is described. Using [Cu(dap)2]Cl (1 mol %), a wide range of substrates can be cleanly converted to the target compounds, while commonly employed photoelectron transfer catalysts such as [Ru(bpy)3]Cl2 or fac-Ir(ppy)3 fail in this transformation. The obtained fluorinated sultones are attractive as potential electrolyte
a triple catalysis consisting of photoredox, cobalt, and Brønsted acid catalysts under visible light irradiation. The triple catalysis realizes three key elementary steps in a single catalytic cycle: (1) Co(III) hydride generation by photochemical reduction of Co(II) followed by protonation, (2) metal hydride hydrogen atom transfer (MHAT) of alkenes by Co(III) hydride, and (3) oxidation of the alkyl
我们展示了在可见光照射下通过由光氧化还原、钴和布朗斯台德酸催化剂组成的三重催化,使用醇对未活化烯烃进行马尔科夫尼科夫加氢烷氧基化。三重催化在单个催化循环中实现了三个关键的基本步骤:(1)通过光化学还原 Co(II)然后质子化生成 Co(III)氢化物,(2)通过 Co 对烯烃的金属氢化物氢原子转移(MHAT) (III)氢化物,和(3)烷基Co(III)配合物氧化成烷基Co(IV)。三种催化剂对质子和电子的精确控制可以消除传统方法中所需的强酸和外部还原剂/氧化剂。
Gem-disubstituent effects in small ring formation: Novel ketal ring size effect
作者:Michael E. Jung、Rodolfo Marquez
DOI:10.1016/s0040-4039(97)01519-0
日期:1997.9
reaction of the corresponding bromoalkene with a 6-membered ketal 6b gave good yields of the cyclobutane 17b, in a novel ketal ring size effect. Also the gem-dicarboalkoxy effect was operative in these systems, e.g., cyclization of the bromo alkene triester 11a afforded reasonable yields of the cyclobutane 19.