摘要:
A reagent having the general formula of General Formula I: wherein group Z comprises a spacer selected from an aliphatic chain up to about 6 carbon equivalents in length, an unbranched aliphatic chain of from about 6 to 18 carbon equivalents in length with at least one of an intermediate amide and a disulfide moiety, and a polyethylene glycol chain of from about 3 to 12 carbon equivalents in length; wherein group R is an electrophilic or nucleophilic moiety suitable for reaction of the reagent with a biologically active species; and wherein group Q is one of nothing at all, an amide, a methyl amide, a methylene, an ether, a thioether, a methyl ether, and a methyl thioether moiety. Also, a conjugate, a bioconjugate and a method of conjugating.
摘要:
The present invention provides a process for preparing a polyaromatic compound comprising at least one sequence of two aromatic rings. The process of the invention, which consists in reacting an aromatic compound bearing a leaving group and an arylboronic acid and/or its derivatives in the presence of a base and an effective amount of a nickel catalyst, is characterized in that the reaction is conducted in a reaction solvent which is water optionally in a mixture with an organic solvent and in the presence of an effective amount of a catalyst based on nickel with at least one water-soluble phosphine ligand.
摘要:
Compounds of the formula (I) in which Q1 and Q2 are each OH or form a trimeric boric anhydride, Z is CHO, CH2Y, X or a protected aldehyde group, and X is CN, COOH, COCl, CONH2 or C(OR)3, and Y is OH or NH2, and Z is in the o-, m- or p-position to the boronic acid radical, are prepared by a) reacting a compound of the formula (II) with Mg in the presence of an anthracene compound and, if desired, a transition-metal halide and, if desired, an Mg halide or in the presence of a transition-metal halide and, if desired, an Mg halide, to give the corresponding arylmagnesium chloride, b) reacting the latter with a borate of the formula B(OR′)3 and hydrolyzing the product, with removal of the aldehyde protecting group, c) and, if desired, oxidizing or reducing the free aldehyde group.
摘要:
A process for preparing boratabenzene derivatives is provided. The process includes the hydrogenation of a compound containing a boranaphthalene functional group to form a boratabenzene-containing compound. Depending on the compound containing a boranaphthalene functional group, the resulting boratabenzene compound may be converted into a catalyst suitable for olefin polymerization. A process for forming a boratabenzene derivative from a halo-dioxaborolane is also provided. In this process, a halo-dioxaborolane is reacted with a piperylide salt for form a pentadienyl dioxaborolane. The pentadienyl-dioxaborolane is reacted with a strong base to form an intermediate boratacyclohexanediene salt. The intermediate boratacyclohexanediene salt is then reacted with a trialkylaluminum compound to form an alkylboratabenzene salt.
摘要:
A solution comprising a halomagnesium tetrakis(Faryl)borate in a liquid organic medium, wherein the liquid organic medium is comprised of one or more liquid dihydrocarbyl ethers, one or more liquid hydrocarbons, one or more liquid halogenated hydrocarbons, or mixtures thereof, is contacted with water. This produces magnesium di[tetrakis(Faryl)borate] in the organic phase of a two-phase water/liquid organic medium. The magnesium di[tetrakis(Faryl)borate] can be, but need not be, isolated. A protic ammonium salt, an onium salt, or a triarylmethyl salt can be reacted with the magnesium di[tetrakis(Faryl)borate] to produce the corresponding protic ammonium, onium, or triarylmethyl tetrakis(Faryl)borate. The magnesium di[tetrakis(Faryl)borate] can instead be reacted with a metal salt to form a metal tetrakis(Faryl)borate. The produced metal tetrakis(Faryl)borate can be further reacted with a protic ammonium salt, an onium salt, or a triarylmethyl salt to yield a protic ammonium, onium, or triarylmethyl tetrakis(Faryl)borate. Certain of these tetrakis(Faryl)borates can be conveniently purified via the formation of a liquid clathrate at ambient temperatures.
摘要:
A process for preparing formylphenylboronic acids of the formula (I) by reaction of protected chlorobenzaldehydes of the formula (II) with lithium in an inert solvent to form compounds of the formula (III) and subsequent reaction with a boron compound of the formula BY3 to give compounds of the formula (I).
摘要:
A process for preparing bisallylboranes of the formula (I) by reacting a diene with sodium borohydride in the presence of an oxidant in an inert solvent, with the borane generated in situ reacting selectively with the diene to form the bis(allyl)borane of the formula (I) and the substituents R1 to R6 having the following meanings: R1-R6 are H, aryl or substituted or unsubstituted C1-C4-alkyl or two radicals R may be closed to form a cyclic system. As oxidant, it is possible to use, for example, alkyl halides or dialkyl sulfates. In a particularly preferred embodiment, the diene used is 2,5-dimethylhexa-2,4-diene (R1, R2, R5, R6=methyl, R3, R4=H).
摘要:
A novel process for preparing perhalogenated monoorganoboranes or diorganoboranes which makes it possible to obtain these compounds under conditions which can readily be implemented in the industry is described.
摘要:
Reagents suitable for the modification of a bioactive species for the purpose of incorporating one or more phenyldiboronic acid (PDBA) moieties for subsequent conjugation to a different (or the same) bioactive species having one or more pendant boronic compound complexing moieties of the general formula of General Formula I, wherein group R is a reactive electrophilic or nucleophilic moiety suitable for reaction of the PDBA reagent with a bioactive species. Group Z is a spacer selected from a saturated or unsaturated chain up to about 0 to 6 carbon equivalents in length, an unbranched saturated or unsaturated chain of from about 6 to 18 carbon equivalents in length with at least one intermediate amide or disulfide moiety, and a polyethylene glycol chain of from about 3 to 12 carbon equivalents in length. Group Q is a linkage that includes one of amide, ether and thioether moieties. Group R is preferably selected from, but not limited to, one of acrylamide, bromo, bromoacetamide, chloro, chloroacetamide, dithiopyridyl, hydrazide, N-hydroxysuccinimidyl ester, N-hydroxysulfo-succinimidyl ester, imidate ester, imidazolide, iodo, iodoacetamide, maleimide, amino and thiol moieties. Group Z is preferably an unbranched alkyl chain of the general formula (CH2)n, wherein n=1 to 6. Group Q is preferably selected from one of NHCO, CONH, NHCOCH2, CONHCH2, O, OCH2, S, and SCH2 moieties.
摘要:
There is provided a process for preparing tetraalkyl ammonium halide utilizing a catalytic amount of acetonitrile in a reaction under pressure and at an elevated temperature of an alkyl halide and a trialkyl halide and in which tetrafluoroborate can be subsequently prepared.