PHOTOCHEMICAL SYNTHESES: SULPHENES AS PHOTOCHEMICAL INTERMEDIATES
作者:J. F. King、P. De Mayo、E. Morkved、A. B. M. A. Sattar、A. Stoessl
DOI:10.1139/v63-012
日期:1963.1.1
The present status of sulphenes (R′R″C:SO2) as stable entities or chemical intermediates is discussed. The early report by Locher and Fierz (Helv. Chim. Acta, 10, 642 (1927)) of the preparation of a stable crystalline sulphene has been investigated; it is concluded that their claim is unfounded.The irradiation of unsaturated sultones in the presence of methanol is shown to give sulphonic esters: the
A highly efficient (aS)-Ir/In-BiphPHOX-catalyzed asymmetric hydrogenation of substituted 2H-chromenes and substituted benzo[e][1,2]oxathiine 2,2-dioxides is described. A series of 2H-chromenes and benzo[e][1,2]oxathiine 2,2-dioxides were hydrogenated to give the target products in high yields (92–99%) with excellent enantioselectivities (up to 99.7% ee) using our catalytic system. This reaction provides
描述了一种高效的(S)-Ir / In-BiphPHOX催化的取代2 H-色烯和取代苯并[ e ] [1,2]草嘌呤2,2-二氧化物的不对称氢化反应。一系列2 H-色烯和苯并[ e ] [1,2]草嘌呤2,2-二氧化物被氢化,以高收率(92-99%)得到具有优异对映选择性(高达99.7%ee)的目标产物我们的催化系统。该反应为构建手性苯并六元含氧化合物提供了直接而有效的方法。
Method for preparation of 4-methyl-1,2-benzoxathiine 2,2-dioxide derivatives
作者:A. Grandāne、A. F. Mishnev、I. V. Vozny、R. Žalubovskis