摘要
In Ph 3 PAuCl/AgOTf/TsOH system, 2-diazo-5-alkynyl-1,7-diketo carbonyl compounds were transformed into diazo furans . Rh 2 (OAc) 4 -mediated conversion of the diazo furan derivatives into 4 H -cyclopenta[ c ]furan-5(6 H )-one derivatives was accomplished via C(sp 2 )−H insertion reaction at 4-position on the furan ring.
危险品化学品经营许可证（带存储）