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Electronic Effects on the Bergman Cyclisation of Enediynes. A Review

✍ Scribed by Klein, Michael; Walenzyk, Thomas; König, Burkhard

Book ID
123613415
Publisher
UOCHB
Year
2004
Tongue
English
Weight
306 KB
Volume
69
Category
Article
ISSN
0010-0765

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## Abstract Bicyclo[7.3.1]diynes 19a and 19b were prepared by using dibromo olefin 11 and ketone 12 as building blocks. The key step of the synthetic sequence is an intramolecular Nicholas reaction of 17 to give the bicyclo[7.3.1]diyn‐10‐one dicobalthexacarbonyl adducts 18a and 18b (66% total yield