Trioxacarcin Synthesis via Orthogonal Protecting Groups
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Solution Overview
Problem
Current methods lack a fully synthetic route for trioxacarcins, limiting the exploration of their biological and chemical activities and the development of new compounds with improved properties.
Innovation Solution
A fully synthetic route to trioxacarcins is developed using an enantioselective, convergent approach that allows for the selective glycosylation of alcohol functionalities, enabling the creation of differentially protected aglycone DC-45-A2 and its analogues, including unnatural variants with modified glycosylation or functionalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fully synthetic route is developed, then access to unnatural analogs and selective glycosylation is enabled, but the synthesis complexity and number of steps increase
Solution Approach 1:
The synthesis is divided into modular segments with orthogonal protecting groups (acetonide, silyl, benzylidene) that can be selectively removed to access different analogs. This segmentation allows independent modification of various parts of the molecule without affecting the entire structure, enabling systematic exploration of unnatural variants.
Solution Approach 2:
The aglycone is prepared in advance with pre-installed orthogonal protecting groups that facilitate subsequent selective glycosylation. This preliminary preparation of the core structure with built-in selectivity features enables efficient synthesis of multiple analogs from a single precursor.
2Manufacturing precision
If orthogonal protecting groups are used for selective glycosylation, then control over glycosylation position is improved, but the number of protecting group manipulation steps increases
Solution Approach 1:
Different protecting groups with distinct chemical properties are placed at specific positions on the aglycone molecule. Each protecting group responds differently to removal conditions, allowing selective deprotection and glycosylation at specific positions. This local differentiation of protecting group properties enables precise control over glycosylation site selection.
3Manufacturing precision
If enantioselective synthesis is employed, then stereochemical purity is improved, but the synthesis route complexity increases
Solution Approach 1:
Chiral centers are established early in the synthesis through enantioselective reactions, creating a single enantiomer of the aglycone. This preliminary establishment of stereochemistry prevents the need for later resolution steps and ensures consistent stereochemical purity throughout the synthesis of all derived analogs.
Data Source
AI summary
The present invention relates to trioxacarcin compounds of the formula:or pharmaceutically acceptable forms thereof; wherein R1, R2, R3, R4, R5, R6, R7, R8, and R9 are as defined herein. The present invention also provides processes for preparing such compounds and intermediates thereto; pharmaceutical compositions comprising such compounds; and methods of use and treatment.