199188-36-8

Upstream product

• 1493-13-6 trifluorormethanesulfonic acid 
• 3034-86-4 4-ethynylbenzoic acid methyl ester 
• 27607-77-8 trimethylsilyl trifluoromethanesulfonate 
• 358-23-6 trifluoromethylsulfonic anhydride 
• 3609-53-8 methyl 4-acetylbenzoate 

Downstream Products

• 153559-48-9 methyl 4-<1-(5,6,7,8-tetrahydro-3,5,5,8,8-pentamethyl-2-naphthalenyl)ethenyl>benzoate 
• 1325718-57-7 methyl 4-[1-(1,1,3,3,6-pentamethyl-2-oxa-1,3-disilaindan-5-yl)vinyl]benzoate 
• 1325718-55-5 methyl 4-[1-(1,1,3,3,6-pentamethyl-1,3-disilaindan-5-yl)vinyl]benzoate 
• 153559-49-0 bexarotene 
• 196403-59-5 4-[1-(5,5,8,8-Tetramethyl-3-trifluoromethyl-5,6,7,8-tetrahydro-naphthalen-2-yl)-vinyl]-benzoic acid methyl ester 

Relevant academic research and scientific papers

Vicinal Difunctionalization of Alkenes Using Vinyl Triflates Leading to γ-Trifluoromethylated Ketones

We report a new methodology for the synthesis of γ-trifluoromethylated ketones from alkenes and vinyl triflate bifunctional reagents. The reaction proceeds via the addition of a β-trifluoromethyl alkyl radical to a vinyl triflate, followed by β-cleavage.

A base-controlled switch of SO2 reincorporation in photocatalyzed radical difunctionalization of alkenes

Control of selectivity is a pivotal challenge in radical chemistry owing to the high reactivity and instability of radical species. Herein, a switchable, base-controlled strategy toward the reincorporation/release of SO2 in photocatalyzed radical difunctionalization of alkenes has been described. By this chemodivergent strategy, a variety of valuable, otherwise difficult-to-access γ-trifluoromethylated ketones and trifluoromethylated sulfonyl ketones can be selectively furnished from the same starting materials. This method features high chemoselectivity, a broad substrate scope, excellent functional group tolerance, and facile scale-up and was applied in a one-pot synthetic procedure. Evaluation of the reaction conditions and mechanistic studies indicate that the choice of base can invert the chemoselectivity of the reaction, demonstrating control over a challenging radical selectivity pattern.

BEXAROTENE DERIVATIVES AND THEIR USE IN TREATING CANCER

This disclosure relates to compositions and methods for treating cancer. Specifically, this disclosure relates to bexarotene derivatives, methods for treating cancer, autoimmune disorders, and/or skin dermatitis, and/or methods for increasing peripheral blood counts and/or improving immune system function.

Chemoselective Synthesis of 1,1-Disubstituted Vinyl Triflates from Terminal Alkynes Using TfOH in the Presence of TMSN3

1,1-Disubstituted vinyl triflates are synthesized by direct hydrotriflation of terminal alkynes employing a combination of TfOH and TMSN3 in DCM at room temperature. Interestingly, under these conditions, only terminal alkynes were selectively

Visible light induced Trifluoromethyl Migration: Easy Access to α-Trifluoromethylated Ketones from Enol Triflates

Herein, we reported a novel method to synthesize α-trifluoromethylated ketones from enol triflates. Involving a cascade sulfur dioxide extrusion and a CF3 (trifluoromethyl) radical addition process, this reaction proceeds at room temperature an

Radical Desulfur-Fragmentation and Reconstruction of Enol Triflates: Facile Access to α-Trifluoromethyl Ketones

We report an efficient oxidative radical desulfur-fragmentation and reconstruction of enol triflates for the synthesis of α-CF3ketones. Preliminary mechanistic studies disclosed that oxidative fragmentation to release a CF3radical fr

Zinc(II) catalyzed conversion of alkynes to vinyl triflates in the presence of silyl triflates

The conversion of alkynes to their corresponding vinyl triflates in the presence of stoichiometric TMS-triflate was greatly facilitated by the triflate salt of several transition metal catalysts most especially Zn(OTf)2. Products are formed in high regioselectivity under mild conditions. Internal alkynes bearing an aryl substituent afford vinyl triflates with a modest preference for the Z-isomer especially with larger substituents. A mechanism is put forward to explain the unique role of silicon in this system.

Synthesis of novel retinoid X receptor-selective retinoids

Retinoids 1-5 have been identified as potent RXR agonists for evaluation in the treatment of non-insulin-dependent (type II) diabetes mellitus (NIDDM). Highly convergent syntheses of 1-5 have been developed. The core tetrahydronaphthalene 7, employed in the synthesis of 1 and 2, was prepared in 98% yield using an AlCl3-catalyzed (0.03 equiv) Friedel-Crafts alkylation of toluene with 2,5-dichloro-2,5-dimethylhexane 6. A nitromethane-mediated Fridel-Crafts acylation of 7 with chloromethylnicotinate 9 was developed to prepare ketone 10 in 68% yield. Chelate-controlled addition of MeMgCl to 10 followed by dehydration afforded olefin 11 in 65% yield. Cyclopropanation of 11 with trimethylsulfoxonium ylide, followed by saponification, completed a five-step synthesis of 1 in 33% yield. FeCl3-catalyzed (0.05 equiv) Friedel-Crafts acylation of 7 with chloromethyl-terephthalate 14 afforded ketone 15 in 81% yield. Saponification of 15 and reaction with 50% aqueous NH2OH in AcOH afforded a 9:1 mixture of cis and trans oximes, from which the desired cis-oxime 2 was isolated in 43% yield. The core bromo-dihydronaphthalene 29 required for the synthesis of 3-5 was prepared by a Shapiro reaction. Transmetalation of 29 and reaction with Weinreb amides 30b or 36 afforded ketones 32 and 37, which were converted into 3-5 using chemistry comparable to the tetrahydronaphthylene series. Suzuki coupling of boronic acids 41 and 42 with vinyl triflate 43 provided an alternative approach to the synthesis of this class of compounds.

First synthesis of ortho-trifluoromethylated aryl triflates

An efficient method for the preparation of trifluoromethylated aryl triflates (trifluoromethanesulfonates) has been developed. Treatment of 2-iodophenol with trifluoromethanesulfonic anhydride in the presence of triethylamine gives triflate 3. Then, reaction of compound 3 with FSO2CF2CO2Me and CuI in DMF-HMPA affords trifluoromethylated aryl triflate 2. This reaction sequence is also successful for meta- and para-trifluoromethylated aryl triflates. Based on this methodology, the trifluoromethylated aryl triflate 11, a key intermediate for the preparation of the conformationally restricted retinoid 8 containing a trifluoromethyl group, has been synthesized. The cross-coupling of aryl triflate 11 with vinylstannane 17 under palladium catalysis provides compound 18, the methyl ester of retinoid 8, in moderate yield.