A Photoenzymatic Pathway for Gram-Scale Synthesis of 25-Hydroxyvitamin D₃

Area of Science:

• Biochemistry
• Organic Chemistry
• Sustainable Chemistry

Background:

• Vitamin D and its analogues are essential for human and animal health.
• Current chemical synthesis methods for vitamin D are inefficient and environmentally taxing.
• There is a need for sustainable and efficient synthetic routes in the chemical industry.

Purpose of the Study:

• To develop an alternative, sustainable synthesis for 25-hydroxyvitamin D3.
• To establish a photoenzymatic approach for vitamin D production.
• To address the limitations of current chemical synthesis methods for vitamin D analogues.

Main Methods:

• A sequential photoenzymatic synthesis starting from 7-dehydrocholesterol.
• Enzymatic hydroxylation at the C25 C-H bond of 7-dehydrocholesterol.
• Photo-irradiation with monochromatic LED UV light followed by thermal isomerization.

Main Results:

• Achieved 85% conversion to 25-hydroxyl-7-dehydrocholesterol in the initial enzymatic step.
• Successfully synthesized 25-hydroxyvitamin D3 via a photoenzymatic pathway.
• Demonstrated reduced purification requirements and enabled gram-scale synthesis.

Conclusions:

• The developed photoenzymatic process is selective, efficient, and environmentally friendly.
• This method provides a sustainable alternative for synthesizing 25-OH-vitamin D3.
• The approach overcomes the drawbacks of traditional, lengthy chemical synthesis pathways.