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ChemInform Abstract: Stereoselective Preparation of Vitamin D Precursors Using the Intramolecular Coupling of Alkynes and Cyclopropylcarbene—Chromium Complexes: A Formal Total Synthesis of (.+-.)-Vitamin D3.

✍ Scribed by J. YAN; J. W. HERNDON

Publisher
John Wiley and Sons
Year
2010
Weight
37 KB
Volume
29
Category
Article
ISSN
0931-7597

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✦ Synopsis

Stereoselective Preparation of Vitamin D Precursors Using the Intramolecular Coupling of Alkynes and Cyclopropylcarbene-Chromium Complexes: A Formal Total Synthesis of (±)-Vitamin D 3 . -The intramolecular coupling of the complexes (III) proceeds with high diastereoselectivity. Catalytic hydrogenation of the resulting pyrans leads to ring opening products like (V). (V) can easily be transformed into the precursor (VI) of vitamin D 3 . -(YAN,

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