2306-23-2

Upstream product

• 88517-54-8 (1S,2S,6R,7R)-4,4-Dimethyl-3,5,10-trioxa-tricyclo[5.2.1.0^2,6]decane-8-carboxylic acid methyl ester 
• 17791-32-1 7-Oxabicyclo<2.2.1>hept-5-en-2-carbonsaeure-methylester 
• 88517-53-7 cis-exo-2,3-dihydroxy-6-methoxycarbonyl-7-oxabicycloheptane 
• 88165-26-8 (+/-)-3,4-O,O-isopropylidine-1-methoxycarbonyl-3α,4α,5α-trihydroxycyclohexene 
• 4372-89-8 (+/-)-methyl 5-epishikimate 
• 1476028-68-8 (3R,4S,5R)-ethyl 3,4-epoxy-5-hydroxycyclohex-1-ene-1-carboxylate 
• 261631-95-2 (-)-(1S)-1-{(4S,5S)-5-[(1S)-1-hydroxy-2-propenyl]-2,2-dimethyl-1,3-dioxolan-4-yl}-2-propen-1-ol 
• 1121652-18-3 (3aS,5aS,6aS,6bS)-2,2-dimethyl-3a,5a,6a,6b-tetrahydrooxireno-[2′,3′:3,4]benzo[1,2-d][1,3]dioxole 
• 1583240-50-9 (3aR,4S,5aR,6aR,6bS)-2,2-dimethylhexahydrooxireno[2′,3′:3,4]-benzo[1,2-d][1,3]dioxol-4-ol 
• 145107-27-3 (3aR,5aR,6aR,6bR)-2,2-dimethyl-3a,5a,6a,6b-tetrahydrooxireno-[2′,3′:3,4]benzo[1,2-d][1,3]dioxole 
• 1582805-94-4 (1R,2R,3S,4S)-1-chloro-2-acetoxy-3,4-(isopropylidenedioxy)-cyclohex-5-ene 

Relevant academic research and scientific papers

Stereodivergent Syntheses of All Stereoisomers of (?)-Shikimic Acid: Development of a Chiral Pool for the Diverse Polyhydroxy-cyclohexenoid (or -cyclohexanoid) Bioactive Molecules

Novel stereodivergent total syntheses of all the seven stereoisomers of (?)-shikimic acid [(?)-SA 1] have been systematically performed. (+)-ent-SA ent-1 was synthesized from (?)-SA 1 via 9 steps in 31 % overall yield; (?)-3-epi-SA 2 was synthesized from (?)-SA 1 via 5 steps in 66 % overall yield; (+)-3-epi-ent-SA ent-2 was synthesized from (?)-SA 1 via 7 steps in 43 % overall yield; (?)-4-epi-SA 3 was synthesized from (?)-SA 1 via 11 steps in 32 % overall yield; (+)-4-epi-ent-SA ent-3 was synthesized from (?)-SA 1 via 7 steps in 42 % overall yield; (?)-5-epi-SA 4 was synthesized from (?)-SA 1 via 6 steps in 56 % overall yield; and (+)-5-epi-ent-SA ent-4 was synthesized from (?)-SA 1 via 12 steps in 29 % overall yield. The stereochemistry of all the above seven stereoisomers of (?)-SA 1 were further studied by two dimensional (2D) 1H NMR technique.

A C 2-symmetric chiral pool-based flexible strategy: Synthesis of (+)- and (-)-shikimic acids, (+)- and (-)-4- epi -shikimic acids, and (+)- and (-)-pinitol

Via combination of a novel acid-promoted rearrangement of acetal functionality with the controlled installation of the epoxide unit to create the pivotal epoxide intermediates in enantiomerically pure form, a simple, concise, flexible, and readily scalable enantiodivergent synthesis of (+)- and (-)-shikimic acids and (+)- and (-)-4-epi-shikimic acids has emerged. This simple strategy not only provides an efficient approach to shikimic acids but also can readily be adopted for the synthesis of (+)- and (-)-pinitols. These concise total syntheses exemplify the use of pivotal allylic epoxide 14 and its enantiomer ent-14. A readily available inexpensive C2-symmetric l-tartaric acid (7) served as key precursor. In general, the strategy here provides a neat example of the use of a four-carbon chiron and offers a good account of the synthesis of functionalized cyclohexane targets.

SHIKIMIC ACIDS FROM FURAN; METHODS OF STEREOCONTROLLED ACCESS TO 3,4,5-TRIOXIGENATED CYCLOHEXENES

Oxabicycloheptenes 1 and 2 are converted to 3,4,5-oxigenated cyclohexenes by stereocontrolled hydroxylations and epoxidations coupled with reverse-Michael cleavage of the oxabicyclo system.Three epimers of shikimic acid are synthesized by these methods.