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Related Experiment Video

Updated: Feb 7, 2026

Generation of Scalable, Metallic High-Aspect Ratio Nanocomposites in a Biological Liquid Medium

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Published on: July 8, 2015

Scalable Synthesis of Cyclocitrinol.

Yu Wang¹, Wei Ju¹, Hailong Tian¹

¹CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Center for Excellence in Molecular Synthesis , Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences , 345 Lingling Road , Shanghai 200032 , China.

Journal of the American Chemical Society

|July 17, 2018

Summary

Researchers report a 10-step synthesis for the C25 steroid cyclocitrinol, starting from pregnenolone. This efficient method utilizes a biomimetic cascade rearrangement to build the complex bicyclo[4.4.1] A/B ring system.

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Area of Science:

Organic Chemistry
Natural Product Synthesis
Biochemistry

Background:

Steroid natural products possess complex structures with potential therapeutic applications.
Cyclocitrinol is a C25 steroid with a unique bicyclo[4.4.1] A/B ring system.
Understanding the synthesis and biosynthesis of such molecules is crucial for chemical and biological research.

Purpose of the Study:

To develop an efficient and scalable synthetic route to the natural product cyclocitrinol.
To investigate a biomimetic cascade rearrangement for constructing the challenging bicyclo[4.4.1] A/B ring system.
To provide experimental evidence supporting the proposed biosynthetic pathway of cyclocitrinol.

Main Methods:

A 10-step synthetic sequence was designed starting from the readily available pregnenolone.
A key biomimetic cascade rearrangement was employed to construct the fused bicyclo[4.4.1] A/B ring core.
Gram-scale synthesis of a key bicyclo[4.4.1] enone intermediate was achieved.

Main Results:

A total of 10 steps were required for the synthesis of cyclocitrinol.
The biomimetic cascade rearrangement proved highly effective in forming the A/B ring system.
A gram-scale synthesis of intermediate 18 was successfully accomplished in nine steps.
The synthetic route provides experimental validation for the proposed biosynthesis of cyclocitrinol.

Conclusions:

An efficient 10-step synthesis of the C25 steroid cyclocitrinol has been established.
The developed synthetic strategy, featuring a biomimetic cascade, is effective for constructing the bicyclo[4.4.1] A/B ring system.
This research offers valuable insights into the biosynthesis of cyclocitrinol.