Total synthesis of sinenside A

Area of Science:

• Organic Chemistry
• Natural Product Synthesis
• Carbohydrate Chemistry

Background:

• Norlignan glucosides are a class of natural products with potential biological activities.
• Sinenside A is a specific norlignan glucoside whose total synthesis has not been previously reported.
• The unique structural features of sinenside A, particularly its cyclic disaccharide core, present a significant synthetic challenge.

Purpose of the Study:

• To achieve the first total synthesis of the natural product sinenside A.
• To develop a novel synthetic strategy for constructing the unique cyclic disaccharide core of sinenside A.
• To establish a reliable method for controlling the trans-1,2-diol configuration within the disaccharide.

Main Methods:

• Employing an intramolecular acetalization reaction as the key step for forming the cyclic disaccharide core.
• Utilizing a 1,2-orthoester group as a versatile handle for sp glycosidation.
• Implementing the 1,2-orthoester for selective differentiation of the C2'-hydroxyl group involved in the acetalization.

Main Results:

• Successful completion of the first total synthesis of sinenside A.
• Demonstration of the efficacy of intramolecular acetalization for constructing the cyclic disaccharide core.
• Establishment of the unique trans-1,2-diol configuration through early stereochemical control.
• Effective use of the 1,2-orthoester for glycosidation and protecting group strategies.

Conclusions:

• The first total synthesis of sinenside A has been successfully accomplished, validating the developed synthetic route.
• The intramolecular acetalization strategy provides an efficient method for constructing complex cyclic disaccharide systems.
• The synthetic approach highlights the importance of early stereochemical control in accessing unique natural product architectures.