56260-42-5

Basic information

• Product Name: trans-4-methoxycarbonyl-3-phenyl-3,4-dihydroisocoumarin
• CAS NO: 56260-42-5
• Molecular Weight: 282.296
• Mol File: 56260-42-5.mol
• Article Data: 7

Chemical Properties

• CAS DataBase Reference: trans-4-methoxycarbonyl-3-phenyl-3,4-dihydroisocoumarin(CAS DataBase Reference)
• NIST Chemistry Reference: trans-4-methoxycarbonyl-3-phenyl-3,4-dihydroisocoumarin(56260-42-5)
• EPA Substance Registry System: trans-4-methoxycarbonyl-3-phenyl-3,4-dihydroisocoumarin(56260-42-5)

Safety Data

• Hazardous Substances Data: 56260-42-5(Hazardous Substances Data)

Upstream product

• 100-52-7 benzaldehyde 
• 703-59-3 homophthalic anhydride 
• 67-56-1 methanol 
• 68204-74-0 trans-(+/-)-3-phenyl-3,4-dihydroisocoumarin-4-carboxylic acid 
• 186581-53-3 diazomethane 
• 716-43-8 dimethyl homophthalate 
• 90959-08-3 3-phenyl-3,4-dihydro-1-oxo-1H-2-benzopyran-4-carboxylic acid 
• 89-51-0 Homophthalic acid 
• 1370021-89-8 C₁₆H₁₁BrO₄ 
• 1370021-81-0 C₁₆H₁₂O₄ 
• 18107-18-1 diazomethyl-trimethyl-silane 
• 1370021-99-0 (3R,4R)-methyl 3-(4-bromophenyl)-1-oxoisochroman-4-carboxylate 

Relevant articles and documents

A novel dual organocatalyst for the asymmetric pinder reaction and a mechanistic proposal consistent with the isoinversion effect thereof

In general, the Pinder reaction concerns the reaction between an enolisable anhydride and an aldehyde proceeding initially through a Knoevenagel reaction followed by the ring closing process generating lactones with at least two chiral centers. These scaffolds are frequently present in natural products and synthetic bioactive molecules, hence it has attracted intense interest in organic synthesis and medicinal chemistry, particularly with respect to controlling the diastereo-and enantioselectivity. To the best of our knowledge, there has been only one attempt prior to this work towards the development of a catalytic enantioselective Pinder reaction. In our approach, we designed, synthesized, and tested dual chiral organocatalysts by combining BIMAH amines, (2‐(α‐ (alkyl)methanamine)‐1H‐benzimidazoles, and a Lewis acid motif, such as squaramides, ureas and thioureas. The optimum catalyst was the derivative of isopropyl BIMAH bearing a bis(3,5‐ trifluoromethyl) thiourea, which afforded the Pinder products from various aromatic aldehydes with diastereomeric ratio >98:2 and enatioselectivity up to 92 ee%. Interestingly, the enantioselectivity of this catalyzed process is increased at higher concentrations and exhibits an isoinversion effect, namely an inverted ?U? shaped dependency with respect to the temperature. Mechanistically, these features, point to a transition state involving an entropy‐favored heterodimer interaction between a catalyst/anhydride and a catalyst/aldehyde complex when all other processes leading to this are much faster in comparison above the isoinversion temperature.

ENANTIOSELECTIVE ORGANIC ANHYDRIDE REACTIONS

Disclosed herein is enantioselective synthetic method comprising reacting an enolisable C4-C50 organic anhydride with a second compound selected from the group consisting of an aldehyde, a ketone, an aldimine, a ketimine or a Michael Acceptor in the presence of a bifunctional organocatalyst. The reaction may find particular utility in the enantioselective synthesis of medicinally relevant heterocycles, such as dihydroisocoumarins and dihydroisoquinolinones.

A catalytic asymmetric reaction involving enolizable anhydrides

In the presence of a highly efficient novel bifunctional organocatalyst at low loadings under mild conditions, enolizable homophthalic anhydrides can be added to a range of aromatic and aliphatic aldehydes to give dihydroisocoumarins, with excellent yields and diastereo-and enantiocontrol (up to 99% ee).