From Phytochemicals

The process for producing progesterone from soybean-derived stigmasterol is outlined in Chapter 2. 

Steroid Chemistry at a Glance Daniel Lednicer 2011 John Wiley Sons, Ltd 

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The power of superfruits exists mainly in their established natural nutrients but also is exhibited in other natural compounds, called phytochemicals. Among nature s astounding variety, phytochemicals comprise thousands of different compounds, including the pigments that give fruits their bright colors. Think of the wonderful red luster of a fresh strawberry that crimson color comes from phytochemical pigments called anthocyanins, which hold potential value for health. 

Table 1. Alkaloid-positive plants from phytochemical surveys...

Chemical manipulations of aromatic A-ring steroids, the estranes, are described in Chapter 3. The relative simplicity of the structure of estranes has led to the development of close to half a dozen syntheses that differ in approach, starting from laboratory chemicals. One of these total syntheses, in contrast to those found in subsequent chapters, is used in actual practice to prepare intermediates for the gonanes discussed in Chapter 4. There follows a description of the process long used to prepare aromatic A-ring steroids from phytochemical-derived sources. Chemical reactions of estranes close this chapter. 

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