A highly efficient cobalt-catalyzed homocoupling of terminal alkynes with di-tert-butyldiaziridinone as the oxidant has been developed. The protocol tolerates a wide array of terminal alkynes, both activated and unactivated alkynes, to afford the corresponding conjugated 1,3-diynes. The mild reaction conditions further allow late-stage homocoupling of alkynes derived from complex natural products.
Synthesis of 1,3‐Diynes Using Calcium Carbide as an Alkyne Source
作者:Zhenrong Liu、Zheng Li
DOI:10.1002/ejoc.202001324
日期:2021.1.15
As a surrogate of gaseous acetylene, calcium carbide can be directly used as an easy‐to‐handle alkyne source for the synthesis of 1,3‐diynes under mild conditions using air as oxidant.
Dihydrosilanes undergo double trans-hydrosilylation with 1,4-diarylbuta-1,3-diynes in the presence of a cationic ruthenium catalyst to afford 2,5-diarylsiloles: in particular, 9-silafluorene is a good hydrosilylating agent to produce spiro-type siloles in good yield.