103531-49-3

Upstream product

• 103477-65-2 (1S,2R,3S,4S)-1-(3,4-Dimethoxy-phenyl)-4,6,7-trimethoxy-1,2,3,4-tetrahydro-naphthalene-2,3-dicarboxylic acid dimethyl ester 
• 77-78-1 dimethyl sulfate 
• 21852-32-4 4-bromomethyl-1,2-dimethoxybenzene 
• 5392-10-9 2-bromo-4,5-dimethoxybenzaldehyde 
• 93-03-8 (3,4-dimethoxyphenyl)methanol 
• 103477-62-9 cis-1-(3,4-dimethoxyphenyl)-3,5,6-trimethoxy-1,3-dihydrobenzothiophene 2,2-dioxide 
• 103477-60-7 1-(3,4-dimethoxyphenyl)-3-hydroxy-5,6-dimethoxy-1,3-dihydrobenzothiophene 2,2-dioxide 
• 103477-67-4 6-(3,4-dimethoxybenzyl)veratrldehyde ethylene glycol acetal 
• 103477-59-4 6-(3,4-dimethoxybenzyl)veratraldehyde 
• 120-14-9 3,4-dimethoxy-benzaldehyde 
• 103477-58-3 2-(2-bromo-4,5-dimethoxyphenyl)-1,3-dioxolane 

Relevant academic research and scientific papers

Photoredox Generated Carbonyl Ylides Enable a Modular Approach to Aryltetralin, Dihydronaphthalene, and Arylnaphthalene Lignans

A one-pot synthesis of dihydronaphthalenes and arylnaphthalenes from epoxides and common dipolarophiles is described. The reaction proceeds through photoredox activation of epoxides to carbonyl ylides, which undergo concerted [3 + 2] dipolar cycloaddition with dipolarophiles to provide tetrahydrofurans or 2,5-dihydrofurans. In the same flask, acid promoted rearrangement affords densely functionalized dihydronaphthalenes and arylnaphthalenes, respectively, in an overall redox-neutral sequence of transformations. Succinct total synthesis (4-6 steps) of pycnanthulignene B and C and justicidin E are reported.

A TETRAMERIC DERIVATIVE OF CAFFEIC ACID FROM RABDOSIA JAPONICA

A component which showed tanning activities, was isolated from Rabdosia japonica, and was named rabdosiin.It was shown to be a tetramer of caffeic acid with a lignan skeleton.Key Word Index-Rabdosia japonica; Labiatae; structure determination; tannin; lig

Asymmetric Lignan Synthesis: Isolariciresinol Dimethyl Ether

An asymmetric synthesis of the lignan (+)-isolariciresinol dimethyl ether 1 in nine steps and 13percent yield (83percent optical purity) from veratraldehyde is described.Veratraldehyde was converted to 6-(3,4-dimethoxybenzyl)veratraldehyde 3 by bromination, acetal formation, metalation, and coupling to 3,4-dimethoxybenzyl bromide. 3 was irradiated in the presence of SO2 to give the 3-hydroxy-1-aryl-1,3-dihydrobenzothiophene 2,2-dioxide 4, which was converted to the (R)-1-phenylethoxy derivative 5b. 5b on heating with dimethyl fumarate gave a mixture of primarily two diastereomeric cycloadducts 7b and 7b', both of which had the 1,2-trans, 2,3-trans , 3,4-cis stereochemistry.The major adduct 7b was subsequently assigned the stereochemistry 1S,2R,3S,4S.Separation and hydrogenolysis of the major adduct gave the diester 8, 1S,2R,3R, which was reduced with LiAlH4 to give (+)-isolariciresinol dimethyl ether 1.A racemic synthesis was also carried out via the methoxy sulfone 5a and its trans isomer 5a' in 33percent yield.