Synthesis and reactivity of benzylic sulfonium salts: benzylation of phenol and thiophenol under near-neutral conditions
作者:Julie Forrester、Ray V.H Jones、Lee Newton、Peter N Preston
DOI:10.1016/s0040-4020(01)00137-5
日期:2001.4
- and related hydrogensulfate salts have been synthesized from the ternary system ArCH2OH:H2SO4: Me2S or tetrahydrothiophene. The salts are generally stable crystalline solids, but anomalously high reactivity is observed for 9-(anthrylmethyl)dimethylsulfonium hydrogensulfate. Selected sulfonium salts have been used for the O- and S-benzylation of phenol and thiophenol, respectively, in a two phase
从三元体系ArCH 2 OH:H 2 SO 4:Me 2 S或四氢噻吩合成了一系列苄基二甲基ulf盐和相关的硫酸氢盐。所述盐通常是稳定的结晶固体,但是对于9-(蒽甲基)二甲基ulf硫酸氢盐观察到异常高的反应性。在接近中性的两相体系中,已选择的sulf盐分别用于苯酚和硫酚的O-和S-苄基化。还描述了在碱性条件下肟和苯并咪唑的苄基化。
Ring-Opening Cyclization of Spirocyclopropanes Using Sulfoxonium Ylides
作者:Yuta Onuki、Hisanori Nambu、Takayuki Yakura
DOI:10.1248/cpb.c20-00132
日期:2020.5.1
cyclohexane-1,3-dione-2-spirocyclopropanes using dimethylsulfoxonium methylide proceeded regioselectively to produce 2,3,4,6,7,8-hexahydro-5H-1-benzopyran-5-ones in good to high yields. The reactions of cycloheptane- and cyclopentane-1,3-dione-2-spirocyclopropanes could construct [7.6]- and [5.6]-fused ring systems. This reaction was also carried out using sulfoxonium ethylide, butylide, and benzylide
There are disclosed a composition comprising
(E)-1,4-dibromo-2-methyl-2-butene and
(Z)-1,4-dibromo-2-methyl-2-butene, wherein the ratio of the E isomer to the total amount of the E and Z isomers is 0.9 or more; a process for producing the same and a process using the same to produce an allyl halide compound of formula (1):
1
wherein X denotes a bromine atom,
Y denotes an ArS(O)
2
group or an RCOO group,
wherein Ar denotes an aryl group which may be substituted and R denotes a hydrogen atom, a lower alkyl group or an aryl group which may be substituted, and
the wavy line means that the derivative is a mixture of an E or Z geometrical isomer.
SULFONE COMPOUND AND CAROTENOID MANUFACTURING METHOD USING SAID COMPOUND
申请人:Sumitomo Chemical Company, Limited
公开号:EP2253613A1
公开(公告)日:2010-11-24
The present invention relates to a process for producing a sulfone compound of the following formula (3), characterized in that an allyl sulfone compound of the formula (1) and an allyl halide compound of the formula (2) are reacted in an organic solvent in the presence of an alkali metal hydroxide and a phase-transfer catalyst:
wherein A is CH2 or C=O; Ar is an aryl group optionally having 1 to 3 substitutents; and the wavy line means that the steric relation to the double bond which the wavy line is bound to is of E-form, Z-form or a mixture of E/Z;
wherein X is a halogen atom; and the wavy line means the same as defined above; and
wherein A, Ar and the wavy line mean the same as defined above.
The present invention also relates to a process for producing a carotenoid from the same sulfone compound.
SULFONE COMPOUND AND METHOD FOR PRODUCING THE SAME
申请人:Sumitomo Chemical Company, Limited
公开号:EP2261204A1
公开(公告)日:2010-12-15
The present invention relates to a process for producing a sulfone compound represented by formula (1), which comprising a step of obtaining a compound represented by formula (4) by reacting a compound represented by formula (3) with a chlorate or a bromate, and then resulting reaction solution with HX or X2; a step of obtaining a compound represented by formula (5) or formula (6) by reacting a compound represented by formula (4) with a halogenating agent or M(OCOR)n; or a step of obtaining a compound represented by formula (7) by reacting a compound represented by formula (5) or formula (6) with an inorganic base.