A convergent asymmetric synthesis of γ-butenolides
摘要:
The addition of aldehydes to the new enantiomerically pure lithiated sulfoxide-orthoester 13 yielded gamma -butenolides of high enantiomeric purities after elimination of phenylsulfinic acid. The cyclocondensation with ketones was less stereoselective. This new asymmetric synthesis of gamma -butenolides has been applied to a convergent preparation of the antifungal antibiotic (+)-cerulenin. (C) 2001 Elsevier Science Ltd. All rights reserved.
Acid-Catalyzed Oxidative Addition of Thiols to Olefins and Alkynes for a One-Pot Entry to Sulfoxides
作者:Martin Klussmann、Hui-Lan Yue
DOI:10.1055/s-0035-1562480
日期:——
An oxidative variant of the thiol-ene reaction has been developed, achieving the direct addition of thiols to olefins to form sulfoxides. The reaction uses tert-butyl hydroperoxide as oxidant and methanesulfonic acid as catalyst. The latter is believed to catalyze the oxidation of the intermediate sulfide to the sulfoxide. No special precautions are necessary to exclude oxygen, yet the products are
A Mild, Chemoselective Oxidation of Sulfides to Sulfoxides Using <i>o-</i>Iodoxybenzoic Acid and Tetraethylammonium Bromide as Catalyst
作者:Vidyanand G. Shukla、Paresh D. Salgaonkar、Krishnacharya G. Akamanchi
DOI:10.1021/jo034483b
日期:2003.6.1
A mild, selective, and high-yielding method for oxidation of sulfides to sulfoxides using IBX and tetraethylammonium bromide in a variety of solvents is described. The method offers the advantage of short reaction times, no over-oxidation to sulfones, and compatibility to a wide range of functional groups.
efficient synthetic methodology towards the selective synthesis of sulfoxides and sulfones is reported using a cheap and green organocatalytic method. Starting from sulfides and using 2,2,2-trifluoroacetophenone as the organocatalyst and H2O2 as the oxidant, the high-yielding preparation of sulfoxides or sulfones is described, being dependent on the reaction conditions. A highly efficient synthetic methodology
摘要 据报道,一种廉价且绿色的有机催化方法可用于选择性合成亚砜和砜的高效合成方法。从硫化物开始,以2,2,2-三氟苯乙酮为有机催化剂,以H 2 O 2为氧化剂,描述了根据反应条件的高产亚砜或砜的制备方法。 据报道,一种廉价且绿色的有机催化方法可用于选择性合成亚砜和砜的高效合成方法。从硫化物开始,以2,2,2-三氟苯乙酮为有机催化剂,以H 2 O 2为氧化剂,描述了根据反应条件的高产亚砜或砜的制备方法。
A Selective, Convenient, and Efficient Conversion of Sulfides to Sulfoxides
作者:Wei Liang Xu、Yun Zheng Li、Qing Shan Zhang、He Sun Zhu
DOI:10.1055/s-2004-44387
日期:——
A novel, convenient and chemoselectiveprocedure for oxidizing sulfides to sulfoxides with 30% aqueous H 2 O 2 in phenol at room temperature is described. The procedure is very simple and no strict conditions were requiredfor the selective conversion without affecting the functional groups even including the highly reactive aldehyde group. The reactions proceeded very quickly in excellent yields. Some
描述了一种在室温下用苯酚中的 30% H 2 O 2 水溶液将硫化物氧化为亚砜的新颖、方便和化学选择性的方法。该过程非常简单,选择性转化不需要严格的条件,而不影响官能团,甚至包括高反应性醛基。反应以极好的收率进行得非常快。提出了一些描述溶剂作用的实验证据。
<i>α</i>-Fluorination of Sulfoxides Bearing<i>α</i>-Hydrogens by Molecular Fluorine. A Novel Method for the Synthesis of<i>α</i>-Fluorosulfones
作者:Jun Chiba、Takumichi Sugihara、Chikara Kaneko
DOI:10.1246/cl.1995.581
日期:1995.7
Direct formation of α-fluorosulfones from sulfoxides bearing α-hydrogens merely by reacting molecular fluorine (5% F2/N2) is reported and a possible mechanism for this novel α-fluorination reaction is proposed.