Electrochemical Oxidative Aryl(alkyl)trifluoromethylation of Allyl Alcohols via 1,2-Migration
作者:Zhipeng Guan、Huamin Wang、Yange Huang、Yunkun Wang、Shengchun Wang、Aiwen Lei
DOI:10.1021/acs.orglett.9b01518
日期:2019.6.21
An electrochemical oxidative difunctionalization of allyl alcohols for the synthesis of β-trifluoromethyl ketones is achieved through a 1,2-migration process. A series of β-trifluoromethyl ketones can be facilely obtained utilizing CF3SO2Na as a radical source, eliminating the use of metals and sacrificial chemical oxidants. Importantly, this protocol not only realizes aryl migration but also offers
通过1,2-迁移过程可实现烯丙醇的电化学氧化双官能化,以合成β-三氟甲基酮。利用CF 3 SO 2 Na作为自由基源可以轻松获得一系列β-三氟甲基酮,而无需使用金属和牺牲性化学氧化剂。重要的是,该协议不仅实现了芳基迁移,而且还提供了烷基迁移产物。另外,电化学催化的环膨胀和克级反应证明了该方案的合成有用性。
Synthesis of Spirocyclic Butenolides by Ring Closing Metathesis
作者:Peter Langer、Uwe Albrecht
DOI:10.1055/s-2002-34906
日期:——
Spirocyclic butenolides were efficiently prepared by a ring closing metathesis strategy.
通过环闭合复分解策略,成功高效地合成了螺环丁烯内酯。
Development of Synthetic Routes to <scp>d</scp>,<scp>l</scp>-α-Tocopherol (Vitamin E) from Biologically Produced Geranylgeraniol
作者:John A. Hyatt、Gregg S. Kottas、Janet Effler
DOI:10.1021/op020216g
日期:2002.11.1
isophytol as a side-chain synthon for producing d,l-α-tocopherol. Two routes were studied, both of which begin with allylic epoxidation followed by olefin hydrogenation to give epoxyphytol. Epoxyphytol can be reduced with Red-Al to provide phytan-1,3-diol which upon acid-catalyzed condensation with trimethylhydroquinone gives vitaminE in fair yield. In a higher-yielding process, epoxyphytol was deoxygenated
探索了使用生物衍生的二萜醇香叶基香叶醇作为基于石油化学的异植醇的替代品,作为用于生产 d,l-α-生育酚的侧链合成子。研究了两条路线,均以烯丙基环氧化开始,然后烯烃氢化得到环氧植醇。环氧植物醇可以用 Red-Al 还原以提供植烷-1,3-二醇,其在酸催化下与三甲基氢醌缩合以合理的收率生成维生素 E。在更高产率的过程中,环氧植醇与三氧化甲基铼/三苯基膦脱氧,生成植醇和异植醇的混合物(来自香叶基香叶醇的产率 > 90%)。这种混合物可以作为异植醇的“插件”替代品,用于目前实施的维生素 E 化学的最后一步。
Use of iodobenzene diacetate for the synthesis of α-iodoepoxides
作者:Paul Galatsis、Scott D. Millan
DOI:10.1016/0040-4039(91)80515-8
日期:1991.12
Exposure of tertiary allylic alcohols to iodobenzene diacetate-iodine under photochemical conditions results in formation of the corresponding α-iodoepoxides in good yield.
在光化学条件下,将叔烯丙醇暴露于碘代苯二乙酸-碘会导致以高收率形成相应的α-碘环氧化物。
Method for producting macrocyclic ketones
申请人:——
公开号:US20040082816A1
公开(公告)日:2004-04-29
The present invention relates to a novel thermo-isomerization method for rapidly and simply producing macrocyclic ketones of the formula Ia or Ib.
1
The macrocyclic ketones are prepared in the gas phase at temperatures above 500° C. rapidly and in a simple manner from alcohols of the formula IIa and IIb directly with a high yield.
2
In the formulae Ia, Ib, IIa and IIb, R
1
-R
5,
and n have the meanings given in the description.