Preparation of cyclic ether acetals from 2-benzenesulphonylderivatives: a new mild glycosidation procedure
作者:Dearg S. Brown、Steven V. Ley、Sadie Vile
DOI:10.1016/s0040-4039(00)80631-0
日期:1988.1
those containing chemicallysensitive groups react with 2-benzenesulphonyl cyclic ethers in the presence of magnesium bromide etherate and sodium bicarbonate to give good yields of the corresponding acetals.
Use of 2-phenylsulphonyl cyclic ethers in the preparation of tetrahydropyran and tetrahydrofuran acetals and in some glycosidation reactions.
作者:Dearg S. Brown、Steven V. Ley、Sadie Vile、Mervyn Thompson
DOI:10.1016/s0040-4020(01)86389-4
日期:1991.1
2-Phenylsulphonyl cyclic ethers undergo facile displacement of the sulphonyl group by alcohols, in the presence of magnesium bromide etherate and sodium bicarbonate in tetrahydrofuran, to give goodyields of the corresponding acetals.
Substitution reactions of 2-benzenesulphonyl cyclic ethers with carbon nucleophiles
作者:Dearg S. Brown、Maurizio Bruno、Raymond J. Davenport、Steven V. Ley
DOI:10.1016/s0040-4020(01)81323-5
日期:1989.1
Direct substitution of 2-benzenesulphonyl cyclic ethers was studied using a variety of carbon nucleophiles. These nucleophiles included organozinc reagents (derived from aryl, vinyl and alkynyl Grignard reagents) or silyl enolethers, silyl ketene acetals, allylsilanes and trimethylsilylcyanide in the presence of aluminum chloride. A general selectivity for the formation of the trans-product was observed
Direct radical sulfonylation at α-C(sp3)-H of THF with sodium sulfinates in aqueous medium
作者:Manjula Singh、Lal Dhar S. Yadav、Rana Krishna Pal Singh
DOI:10.1016/j.tetlet.2019.02.021
日期:2019.3
convenient and highly regioselective synthesis of 2-alkyl/aryl sulfonyl tetrahydrofurans (THFs) has been achieved from THF and sodium sulfinates using K2S2O8 as a mildoxidant. This one-potsimple protocol involves an efficient radical cross coupling reaction in aqueous medium utilizing K2S2O8 as an inexpensive and easy to handle radical surrogate at roomtemperature.
使用K 2 S 2 O 8作为温和氧化剂,可以从THF和亚磺酸钠中直接合成无过渡金属,方便且高度区域选择性的2-烷基/芳基磺酰基四氢呋喃(THF)。这种一锅简单的方案涉及在水性介质中利用K 2 S 2 O 8作为廉价且易于在室温下进行自由基替代的高效自由基交叉偶联反应。
Preparation of spiroketals by reaction of anions from 2-benzenesulphonyltetrahydropyrans with epoxides: synthesis of the c-11 to c-25 fragment of the milbemycins
作者:Christine Greek、Peter Grice、Steven V. Ley、Anne Wonnacott
DOI:10.1016/s0040-4039(00)85190-4
日期:1986.1
Deprotonation of 2-benzenesulphonyltetrahydropyrans with n-butyllithium affords anions which react with substituted epoxides to give spiroketals upon acidification. Using this approach a highly convergent synthesis of the C-11 to C-25 fragment of the milbemycins was achieved.