59276-33-4

Upstream product

• 67-56-1 methanol 
• 120-14-9 3,4-dimethoxy-benzaldehyde 
• 149-73-5 trimethyl orthoformate 
• 77-76-9 2,2-dimethoxy-propane 
• 121-33-5 vanillin 

Downstream Products

• 119516-19-7 1,4,5-Trimethoxy-3-phenyl-1,3-dihydro-isobenzofuran 
• 71176-37-9 2-(3,4-Dimethoxy-phenyl)-N-[(E)-2-(3,4-dimethoxy-phenyl)-1-(toluene-4-sulfonyl)-vinyl]-2-methoxy-acetamide 
• 252006-15-8 tert-Butyl-{(R)-2-[(4S,5S)-2-(3,4-dimethoxy-phenyl)-5-vinyl-[1,3]dioxan-4-yl]-propoxy}-diphenyl-silane 
• 124080-13-3 C₁₆H₂₂O₈ 
• 162750-65-4 4-(Chloro-methoxy-methyl)-1,2-dimethoxy-benzene 
• 130652-13-0 meso-1,2-bis-(3',4'-dimethoxyphenyl)-1,2-dimethoxyethane 
• 130652-13-0 d,l-1,2-bis-(3',4'-dimethoxyphenyl)-1,2-dimethoxyethane 
• 157580-28-4 (2R,4S,5R)-2-(3,4-Dimethoxy-phenyl)-4-phenyl-oxazolidine-3,5-dicarboxylic acid 3-tert-butyl ester 5-methyl ester 
• 519-05-1 opianic acid 
• 87850-23-5 Benzo[1,3]dioxol-5-yl-(6-dimethoxymethyl-2,3-dimethoxy-phenyl)-methanol 
• 87850-25-7 (6-Dimethoxymethyl-2,3-dimethoxy-phenyl)-methanol 

Relevant academic research and scientific papers

Practical acetalization and transacetalization of carbonyl compounds catalyzed by recyclable PVP-I

A novel PVP-I catalyzed acetalizations/transacetalizations of carbonyl compounds has been developed processing with a mild and easy handling fashion. Different types of Acyclic and cyclic acetals were prepared from carbonyl compounds or their acetals successfully. Further applications of newly developed catalytic combination were testified. This protocol featured with simplicity of operation, mild reaction condition, short reaction time, recyclable of catalyst and broad substrates scope with excellent yields.

Nickel-Catalyzed Chemoselective Acetalization of Aldehydes With Alcohols under Neutral Conditions

A molecularly defined NiII-complex catalyzing the chemoselective acetalization of aldehydes with alcohols under neutral conditions is reported. The reaction is general, efficient and showed a wide substrate scope (including aliphatic aldehydes) as well as excellent functional group tolerance. Reusability of the present nickel catalyst is also demonstrated.

1,3-Oxazolidin-5-ones derived from proline as chiral components in the synthesis of predictive enantioselective coupling reagents

1,3-Oxazolidin-5-ones derived from both enantiomers of proline and trichloroacetaldehyde were prepared and applied as an amine component in the synthesis of chiral predictive triazine-based coupling reagents. The reagents were found to be useful in condensations yielding enantiomerically enriched products from racemic substrates.

Regioselective Bromination of Benzocycloheptadienones for the Synthesis of Substituted 3,4-Benzotropolones Including Goupiolone A

Type-18 or -23 benzocycloheptadienones are readily prepared by ring-closing olefin metatheses. Adding Br2 to 23 and eliminating HBr gave the bromoolefin 28 using DBU or its isomer iso-28 using DABCO, both with near-perfect regiocontrol. Both 28

Acid-catalyzed highly diastereoselective and effective synthesis of 1,3-disubstituted tetrahydropyrano[3,4-b]indoles

We successfully explored for the first time that trifluoroacetic acid (TFA) can effectively catalyze the oxa-Pictet-Spengler reaction of secondary tryptophols and acetals to synthesize 1,3-disubstituted 1,3,4,9-tetrahydropyrano[3,4-b]indoles in high yield (up to >99%) and diastereoselectivity (>20:1). The secondary tryptophols were synthesized from indole-3-acetic acid. The one-pot synthesis of tetrahydropyrano[3,4-b]indoles was successfully developed from secondary tryptophols and in situ prepared acetals from aldehydes and trimethylorthoformate and thus the cost-efficiency of the protocol was effectively enhanced. Finally, the catalytic asymmetric synthesis of the 1,3-disubstituted tetrahydropyrano[3,4-b]indole was also demonstrated after enantioselective achievement of highly enantiopure secondary tryptophols.

NOVEL SUGAR-DERIVED GELATOR

There is provided a novel gelator containing a sugar derivative. A gelator including a compound of Formula (1) or Formula (2): wherein each of R1 and R3 is independently a linear or branched alkyl group having a carbon atom number of 1 to 20, a cyclic C3-20 alkyl group, or a linear or branched alkenyl group having a carbon atom number of 2 to 20, n is 0 or an integer of 1 to 4, R2 is a hydrogen atom, a linear or branched alkyl group having a carbon atom number of 1 to 10, or an aryl group optionally having a substituent, and R4 and R5 are each a hydroxy group.

Structural optimization of super-gelators derived from naturally-occurring mannose and their morphological diversity

Mannose derivatives were synthesized as low molecular-weight gelators with various alkoxy substituents on the aromatic ring of methyl-4,6-O-benzilidene- α-d-mannopyranoside. Most of these mannose derivatives could gel in various solvents, such as octane, cyclohexane, toluene, ethylene glycol and ethanol solutions, at concentrations lower than 2.0 wt%. In particular, the critical gelation concentration (CGC) of methyl-4,6-O-(4-butoxybenzylidene)- α-d-mannopyranoside (2) for squalane was only 0.025 wt%, one of the lowest CGCs we have ever experienced. The observations of xerogels by FE-SEM, TEM and AFM revealed that the length of the alkoxy chains of the mannose derivatives influences the gel morphologies. Moreover, the toluene gels formed from the mannose derivatives 1-6 functionalized by a linear alkoxy group exhibited thixotropic properties. Interestingly, the gels of various solvents formed from methyl-4,6-O-(4-dodecyloxybenzylidene)-α-d-mannopyranoside (6) (with the longest alkoxy chain on the aromatic ring in this paper) exhibited thixotropic properties. Thus, we confirmed that alkoxy groups on the aromatic ring exert noticeable effects on the gelation properties of these mannose derivatives. the Partner Organisations 2014.

Syntheses of 3,4-benzotropolones by ring-closing metatheses

Ortho-lithiated styrenes or ortho-lithiated benzaldehyde dimethyl acetals were added to 2,2-dimethoxypent-4-enals 7. The resulting alcohols were carried on to the aromatic dienones 10. These were ring-closed by olefin metathesis. Hydrolysis of the dimethyl ketal moiety and enolization provided the 3,4-benzotropolones 5. Overall, this access comprises 4-6 steps and totaled a 22-81% yield.

PROCESS FOR PREPARATION OF ROFLUMILAST

The present invention provides novel processes for the preparation of N-substituted benzamides having the formula (VIc). In some embodiments, the invention provides a process for preparation of roflumilast and other pharmaceutically active species. Novel compounds, including intermediates for the synthesis of roflumilast, are also provided.

New two-step sequence involving a hetero-Diels-Alder and a nonphenolic oxidative coupling reaction: A convergent access to analogs of steganacin

A new family of analogs of steganacin, an important antimitotic compound, was accessed. It takes advantage of a completely stereoselective sequence of two key steps. The central dihydropyrane core is built by a highly diastereoselective and facially controlled hetero-Diels-Alder reaction. It is followed by a nonphenolic biaryl oxidative coupling with a complete atropo-stereoselectivity. It leads to a quick way to form cyclic biaryl lignans.