Nickel(0)-promoted synthesis of tetralin lactones from the co-cyclisation of monoynes and octa-1,7-diynes terminally substituted with ester or amide groups
作者:Parveen Bhatarah、Edward H. Smith
DOI:10.1039/p19920002163
日期:——
The co-cyclisation of octa-1,7-diynes with a variety of monoynes mediated by nickel(0) requires ester or amide groups at the terminal positions of the diyne and is subject to steric hindrance about the diyne rather than the monoyne; fused tetralin lactones are the most common products obtained in moderate to good yields. Intramolecular cyclisation of two triynes to the same type of product gives superior yields.
Total Synthesis of Cryptoacetalide
作者:Yan Zou、Alexander Deiters
DOI:10.1021/jo100867v
日期:2010.8.6
We are reporting the first totalsynthesis of the tetracyclicterpene natural product cryptoacetalide. Key steps of the synthesis are a microwave-mediated [2+2+2] cyclo-trimerization reaction to construct the central benzene ring, and a light-mediated radical cyclization to assemble the spiro-ketal moiety.