Ethyl alkynyl ethers: A convenient ketene source for lactone formation
作者:Li Liang、Mahesh Ramaseshan、David I. MaGee
DOI:10.1016/s0040-4020(01)80360-4
日期:1993.3
A convenient and general method for the preparation of lactones of varying size via the intramolecular trapping of a ketene has been developed. Simple thermolysis of various ethoxy acetylene derivatives at 150-degrees-C for 2 hours produced the desired compounds in yields ranging from 30%-75%. The addition of tri-n-butylamine was required to achieve reasonable yields for medium and large rings.